JPH04249748A - Measuring method of constituent concentration of mixture of hydrogen peroxide and ammonia - Google Patents
Measuring method of constituent concentration of mixture of hydrogen peroxide and ammoniaInfo
- Publication number
- JPH04249748A JPH04249748A JP2416075A JP41607590A JPH04249748A JP H04249748 A JPH04249748 A JP H04249748A JP 2416075 A JP2416075 A JP 2416075A JP 41607590 A JP41607590 A JP 41607590A JP H04249748 A JPH04249748 A JP H04249748A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- absorbance
- hydrogen peroxide
- ammonia
- conversion formula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 198
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 93
- 239000000203 mixture Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000470 constituent Substances 0.000 title abstract 2
- 238000002835 absorbance Methods 0.000 claims abstract description 84
- 238000006243 chemical reaction Methods 0.000 claims abstract description 65
- 238000012545 processing Methods 0.000 claims description 9
- 238000000691 measurement method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 23
- 238000000611 regression analysis Methods 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 description 6
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 description 1
- 238000011481 absorbance measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000012628 principal component regression Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、過酸化水素・アンモニ
ア混合液中の各成分の濃度を測定する成分濃度測定方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component concentration measuring method for measuring the concentration of each component in a hydrogen peroxide/ammonia mixture.
【０００２】0002
【従来の技術】従来、過酸化水素・アンモニア混合液中
の各成分の濃度を測定する方法として、紫外吸収−イオ
ン電極法や近赤外吸収法などが提案されている。そのう
ち、前者の紫外吸収−イオン電極法は、過酸化水素の濃
度を吸光法を用いて、アンモニアの濃度をイオン電極を
用いてそれぞれ測定するものである。この測定方法では
、各成分間の相互作用に起因して測定誤差が大きくなる
のを回避するために、測定する濃度範囲を、各成分間の
相互作用が比較的数値化されやすい範囲に限定して行わ
れる。BACKGROUND OF THE INVENTION Hitherto, methods such as the ultraviolet absorption-ion electrode method and the near-infrared absorption method have been proposed as methods for measuring the concentration of each component in a hydrogen peroxide/ammonia mixture. Among them, the former ultraviolet absorption-ion electrode method measures the concentration of hydrogen peroxide using an absorption method and the concentration of ammonia using an ion electrode. In this measurement method, in order to avoid large measurement errors due to interactions between each component, the concentration range to be measured is limited to a range where interactions between each component are relatively easy to quantify. will be carried out.
【０００３】また、後者の近赤外吸収法は、近赤外線を
混合液に照射して、その吸光度から各成分の濃度を測定
するものである。この測定方法では、各成分間の相互作
用に起因して測定誤差が大きくなるのを回避するために
、最高６種類の波長光を用いて測定が行われ、濃度換算
式は主成分回帰法によって求められる。The latter near-infrared absorption method irradiates a mixed liquid with near-infrared rays and measures the concentration of each component from its absorbance. In this measurement method, in order to avoid large measurement errors due to interactions between each component, measurements are performed using up to six different wavelengths of light, and the concentration conversion formula is based on the principal component regression method. Desired.
【０００４】0004
【発明が解決しようとする課題】しかし、上述した従来
例のうち、前者の紫外吸収−イオン電極法では、各成分
の相互作用による誤差を回避するために測定する濃度範
囲が大幅に限定されており、広い濃度にわたって高精度
に測定できない。[Problems to be Solved by the Invention] However, among the conventional methods described above, in the former ultraviolet absorption-ion electrode method, the concentration range to be measured is significantly limited in order to avoid errors caused by interactions of each component. Therefore, it is not possible to measure with high precision over a wide range of concentrations.
【０００５】また、後者の近赤外吸収法では、多種類の
波長光を用いているので広い濃度範囲にわたって測定で
きるけれども、光学素子を多く使用しなければならない
ので、測定装置のコストが高くなるという問題点を有す
る。[0005]Although the latter near-infrared absorption method uses light of many different wavelengths and can measure over a wide concentration range, it requires the use of many optical elements, which increases the cost of the measuring device. There is a problem.
【０００６】上記の従来欠点に鑑み、本発明は、測定系
の構成が簡単で、広い濃度範囲にわたって各成分の濃度
を簡単かつ正確に測定できる過酸化水素・アンモニア混
合液の成分濃度測定方法を提供せんとするものである。In view of the above conventional drawbacks, the present invention provides a method for measuring the concentration of components in a hydrogen peroxide/ammonia mixed solution, which has a simple configuration of the measurement system and can easily and accurately measure the concentration of each component over a wide concentration range. This is what we intend to provide.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、過酸化水素・アンモニア混合液中の各
成分の濃度を、その混合液に照射した特定波長光の吸光
度から求める成分濃度測定方法において、アンモニア濃
度については、特定波長の紫外線の吸光度および特定波
長の近赤外線の吸光度をそれぞれ説明変数として得られ
る重回帰式をアンモニア濃度換算式として求め、過酸化
水素濃度については、前記アンモニア濃度換算式から求
めた濃度が予め定めた値α（ただし、αは１．７から２
．３までの範囲内の値）ｗｔ％以上でかつ特定波長の紫
外線の吸光度が予め定めた値β以上である第１の条件、
前記アンモニア濃度換算式から求めた濃度が前記値αｗ
ｔ％以上でかつ特定波長の紫外線の吸光度が前記値β未
満である第２の条件、前記アンモニア濃度換算式から求
めた濃度が前記値αｗｔ％未満でかつ特定波長の紫外線
の吸光度が前記値β以上である第３の条件、前記アンモ
ニア濃度換算式から求めた濃度が前記値αｗｔ％未満で
かつ特定波長の紫外線の吸光度が前記値β未満である第
４の条件の各場合に分け、第１、第２、第３の条件の場
合には前記紫外線の吸光度および近赤外線の吸光度をそ
れぞれ説明変数として各条件で得られる重回帰式をそれ
ぞれ第１，第２，第３の過酸化水素濃度換算式として求
め、第４の条件の場合には前記アンモニア濃度換算式か
ら求めた濃度および前記紫外線の吸光度をそれぞれ説明
変数として非線型最小２乗処理から得られる回帰式を第
４の過酸化水素濃度換算式として求めることを特徴とし
ている。[Means for Solving the Problems] In order to achieve the above object, the present invention determines the concentration of each component in a hydrogen peroxide/ammonia mixture from the absorbance of light of a specific wavelength irradiated to the mixture. In the component concentration measurement method, for the ammonia concentration, a multiple regression equation obtained using the absorbance of ultraviolet rays of a specific wavelength and the absorbance of near-infrared rays of a specific wavelength as explanatory variables is calculated as an ammonia concentration conversion formula, and for the hydrogen peroxide concentration, The concentration calculated from the ammonia concentration conversion formula is a predetermined value α (however, α is 1.7 to 2
．． 3) wt% or more and the absorbance of ultraviolet rays of a specific wavelength is a predetermined value β or more,
The concentration obtained from the ammonia concentration conversion formula is the value αw
t% or more and the absorbance of ultraviolet rays at a specific wavelength is less than the value β; the concentration calculated from the ammonia concentration conversion formula is less than the value αwt% and the absorbance of ultraviolet rays at a specific wavelength is the value β; The third condition is the above, and the fourth condition is that the concentration calculated from the ammonia concentration conversion formula is less than the value αwt% and the absorbance of ultraviolet rays at a specific wavelength is less than the value β. , in the case of the second and third conditions, the multiple regression equation obtained under each condition is converted into the first, second, and third hydrogen peroxide concentration using the ultraviolet absorbance and near-infrared absorbance as explanatory variables, respectively. In the case of the fourth condition, the concentration obtained from the ammonia concentration conversion formula and the absorbance of the ultraviolet rays are respectively used as explanatory variables, and a regression equation obtained from nonlinear least squares processing is used as the fourth hydrogen peroxide concentration. It is characterized by being calculated as a conversion formula.
【０００８】[0008]
【作用】上記の構成によれば、特定波長の紫外線の吸光
度を第１の説明変数、特定波長の近赤外線の吸光度を第
２の説明変数として得られているアンモニア濃度換算式
に実測された各波長光の吸光度を当てはめることによっ
て、先ず過酸化水素・アンモニア混合液中のアンモニア
濃度が求められる。次に、求められたアンモニア濃度が
予め定めた値αｗｔ％以上で、このときの紫外線の吸光
度が予め定めた値β以上の場合には、これに対応付けて
得られている第１の過酸化水素濃度換算式に上記各波長
光の吸光度を当てはめることによって、また、求められ
たアンモニア濃度が前記値αｗｔ％以上で、このときの
紫外線の吸光度が前記値β未満の場合には、これに対応
付けて得られている第２の過酸化水素濃度換算式に上記
各波長光の吸光度を当てはめることによって、また、求
められたアンモニア濃度が前記値αｗｔ％未満で、この
ときの紫外線の吸光度が前記値β以上の場合には、これ
に対応付けて得られている第３の過酸化水素濃度換算式
に上記各波長光の吸光度を当てはめることによって、さ
らに、求められたアンモニア濃度が前記値αｗｔ％未満
で、このときの紫外線の吸光度が前記値β未満の場合に
は、これに対応付けて非線型最小２乗処理により導かれ
ている第４の過酸化水素濃度換算式にアンモニア濃度お
よび上記紫外線の吸光度を当てはめることによって、そ
れぞれの場合に分けて過酸化水素・アンモニア混合液中
の過酸化水素濃度が求められる。[Operation] According to the above configuration, each of the actually measured ammonia concentrations is applied to the ammonia concentration conversion formula in which the absorbance of ultraviolet rays at a specific wavelength is used as the first explanatory variable and the absorbance of near-infrared rays at a specific wavelength is used as the second explanatory variable. First, the ammonia concentration in the hydrogen peroxide/ammonia mixture is determined by applying the absorbance of the wavelength light. Next, if the determined ammonia concentration is equal to or higher than a predetermined value αwt% and the absorbance of ultraviolet rays at this time is equal to or higher than a predetermined value β, the corresponding first peroxide By applying the absorbance of each wavelength light to the hydrogen concentration conversion formula, and if the obtained ammonia concentration is equal to or higher than the value αwt% and the absorbance of ultraviolet rays at this time is less than the value β, this corresponds to By applying the above-mentioned absorbance of each wavelength light to the second hydrogen peroxide concentration conversion formula obtained by applying If the value is equal to or higher than the value β, by applying the absorbance of each wavelength light to the third hydrogen peroxide concentration conversion formula obtained in association with this, the obtained ammonia concentration is further calculated as the value αwt%. If the absorbance of ultraviolet rays at this time is less than the above value β, the ammonia concentration and the above ultraviolet rays are added to the fourth hydrogen peroxide concentration conversion formula derived by nonlinear least squares processing. By applying the absorbance of , the concentration of hydrogen peroxide in the hydrogen peroxide/ammonia mixture can be determined for each case.
【０００９】[0009]
【実施例】この発明の実施例の説明に入る前に、過酸化
水素・アンモニア混合液中の各成分の濃度と照射光の吸
光度の関係に関して、発明者が行った実験結果から説明
する。EXAMPLES Before entering into the description of the examples of the present invention, the relationship between the concentration of each component in the hydrogen peroxide/ammonia mixture and the absorbance of irradiated light will be explained based on the results of experiments conducted by the inventor.
【００１０】図３は、測定セル中の過酸化水素・アンモ
ニア混合液に波長２２０９．８ｎｍの近赤外線を照射し
たときのアンモニア濃度と近赤外線の吸光度との関係を
、混合液中の過酸化水素の濃度をパラメータとして測定
した結果を示すグラフである。同図において、Ｉ，ＩＩ
，ＩＩＩ は、それぞれ過酸化水素の濃度が０％，１％
，５％のときのグラフを示している。ただし、このとき
の測定セルの長さ、つまり近赤外線の光路長は１ｍｍで
ある。また、このとき使用した近赤外線の波長２２０９
．８ｎｍはアンモニアの特性吸収波長、つまりアンモニ
アに対して吸光度がピークとなる波長であり、分光光度
計を用いて測定している。FIG. 3 shows the relationship between the ammonia concentration and near-infrared absorbance when the hydrogen peroxide/ammonia mixture in the measurement cell is irradiated with near-infrared rays with a wavelength of 2209.8 nm. 3 is a graph showing the results of measurement using the concentration of as a parameter. In the same figure, I, II
, III are hydrogen peroxide concentrations of 0% and 1%, respectively.
, 5%. However, the length of the measurement cell at this time, that is, the optical path length of near-infrared rays, is 1 mm. In addition, the near-infrared wavelength used at this time was 2209
．． 8 nm is the characteristic absorption wavelength of ammonia, that is, the wavelength at which the absorbance of ammonia reaches its peak, and is measured using a spectrophotometer.
【００１１】同図の測定結果から、波長２２０９．８ｎ
ｍの近赤外線を用いた場合、近赤外線の吸光度とアンモ
ニア濃度との間には、ほぼ直線関係が成り立ち、若干、
過酸化水素濃度の影響を受けることが分かる。From the measurement results in the same figure, the wavelength is 2209.8n.
When near-infrared rays of m are used, there is an almost linear relationship between near-infrared absorbance and ammonia concentration,
It can be seen that it is affected by the hydrogen peroxide concentration.
【００１２】図４は、測定セル中の過酸化水素・アンモ
ニア混合液に波長３１２．６ｎｍの紫外線を照射したと
きのアンモニア濃度と紫外線の吸光度との関係を、混合
液中の過酸化水素の濃度をパラメータとして測定した結
果を示すグラフである。同図において、■，■，■，■
，■，■は、それぞれ過酸化水素の濃度が０％，１．３
３％，４．００％，５．３４％，８．００％のときのグ
ラフを示している。ただし、このときの測定セルの長さ
、つまり紫外線の光路長は２ｍｍであり、分光光度計を
用いて測定している。また、このとき使用した紫外線の
波長３１２．６ｎｍは、過酸化水素の特性吸収波長から
少し外れた波長であり、このよう波長を設定することに
よって、測定値が分光光度計の測定レンジ内に収まるよ
うにしている。FIG. 4 shows the relationship between the ammonia concentration and the absorbance of ultraviolet light when the hydrogen peroxide/ammonia mixture in the measurement cell is irradiated with ultraviolet light with a wavelength of 312.6 nm. It is a graph which shows the result of measurement using as a parameter. In the same figure, ■, ■, ■, ■
,■,■ are hydrogen peroxide concentrations of 0% and 1.3, respectively.
Graphs are shown for 3%, 4.00%, 5.34%, and 8.00%. However, the length of the measurement cell at this time, that is, the optical path length of the ultraviolet rays, was 2 mm, and the measurement was performed using a spectrophotometer. In addition, the wavelength of the ultraviolet light used at this time, 312.6 nm, is a wavelength slightly outside the characteristic absorption wavelength of hydrogen peroxide, and by setting the wavelength in this way, the measured value falls within the measurement range of the spectrophotometer. That's what I do.
【００１３】同図の測定結果から、過酸化水素濃度と紫
外線の吸光度との関係に、アンモニア濃度がかなりな影
響を与えていることが分かる。特にアンモニア濃度が２
．０％から５．０％までの範囲と２．０％以下の範囲と
の間では、過酸化水素濃度と紫外線の吸光度と関係に明
らかな相違が有ることが分かる。From the measurement results shown in the figure, it can be seen that the ammonia concentration has a considerable influence on the relationship between the hydrogen peroxide concentration and the absorbance of ultraviolet light. Especially when the ammonia concentration is 2
．． It can be seen that there is a clear difference in the relationship between hydrogen peroxide concentration and ultraviolet absorbance between the range from 0% to 5.0% and the range of 2.0% or less.
【００１４】つまり、図３および図４のグラフから明ら
かなことは、アンモニア濃度については、波長２２０９
．８ｎｍの近赤外線の吸光度を説明変数とする回帰直線
を濃度換算式として、誤差の少ない濃度を求めることが
できるが、若干、過酸化水素濃度の影響を受けるので、
過酸化水素濃度を良く反映する紫外線の吸光度を別の説
明変数として加味することによって、過酸化水素濃度に
よる影響分を補正すれば、アンモニア濃度を精度よく求
めることができるということである。すなわち、アンモ
ニア濃度については、波長２２０９．８ｎｍの近赤外線
の吸光度と、波長３１２．６ｎｍの紫外線の吸光度とを
説明変数とする重回帰式を濃度換算式として導出して置
けば、この濃度換算式からアンモニア濃度を、少なくと
も０〜５ｗｔ％の濃度範囲について正確に測定できると
いうことである。In other words, it is clear from the graphs of FIGS. 3 and 4 that the ammonia concentration
．． Using a regression line with 8 nm near-infrared absorbance as an explanatory variable as a concentration conversion formula, it is possible to find a concentration with little error, but it is slightly affected by the hydrogen peroxide concentration, so
This means that the ammonia concentration can be determined with high accuracy by correcting the influence of the hydrogen peroxide concentration by taking into account the absorbance of ultraviolet rays, which well reflects the hydrogen peroxide concentration, as another explanatory variable. In other words, for ammonia concentration, if a multiple regression equation is derived as a concentration conversion formula using the absorbance of near-infrared rays with a wavelength of 2209.8 nm and the absorbance of ultraviolet rays with a wavelength of 312.6 nm as explanatory variables, this concentration conversion formula can be obtained. This means that the ammonia concentration can be accurately measured over a concentration range of at least 0 to 5 wt%.
【００１５】一方、図４のグラフから明らかなことは、
過酸化水素の濃度と紫外線の吸光度との関係は、アンモ
ニア濃度が２．０％以上のときと、２．０％未満のとき
とで異なるので、これらの場合に分けて過酸化水素濃度
の濃度換算式を求めておけば、かなり誤差の少ない測定
が可能であるということである。On the other hand, what is clear from the graph of FIG.
The relationship between the concentration of hydrogen peroxide and the absorbance of ultraviolet light differs when the ammonia concentration is 2.0% or more and when it is less than 2.0%, so the concentration of hydrogen peroxide is determined separately for these cases. By finding a conversion formula, it is possible to perform measurements with considerably less error.
【００１６】これとは別に、過酸化水素濃度の場合には
、さらに上記紫外線の吸光度が０．１５以上のときと、
０．１５未満のときとの間でも、紫外線の吸光度との関
係が異なること、およびこれらの各条件の中で、アンモ
ニア濃度が２．０ｗｔ％未満で、かつ紫外線の吸光度が
０．１５未満の条件の場合には、アンモニア濃度および
上記紫外線の吸光度を説明変数として、非線型最小２乗
処理により導出される濃度換算式が実際の関係を良く説
明し、その他の条件では、それぞれの条件ごとに重回帰
分析により導出される濃度換算式、つまり上記紫外線の
吸光度と上記近赤外線の吸光度とを説明変数とする重回
帰式が関係を良く説明していることを、本発明の発明者
は見出した。Separately, in the case of hydrogen peroxide concentration, when the absorbance of the ultraviolet rays is 0.15 or more,
Even when the ammonia concentration is less than 2.0 wt% and the ultraviolet absorbance is less than 0.15, the relationship with the ultraviolet absorbance is different. In the case of conditions, the concentration conversion formula derived by nonlinear least squares processing with ammonia concentration and the above ultraviolet absorbance as explanatory variables explains the actual relationship well, and in other conditions, The inventor of the present invention has found that a concentration conversion formula derived by multiple regression analysis, that is, a multiple regression formula in which the absorbance of ultraviolet rays and the absorbance of near-infrared rays are used as explanatory variables, explains the relationship well. .
【００１７】この発明の過酸化水素・アンモニア混合液
の成分濃度測定方法は、以上の測定結果から得られた知
見に基づいて導かれたものであり、以下にその実施例に
ついて説明する。The method for measuring the component concentration of a hydrogen peroxide/ammonia mixture according to the present invention was developed based on the knowledge obtained from the above measurement results, and examples thereof will be described below.
【００１８】図１は、本発明による測定方法が行われる
測定系の概略的な構成を示す模式図である。図において
、フローセル１は測定試料である過酸化水素・アンモニ
ア混合液２を流通させる管路であり、途中を２つの流路
１ａ，１ｂに分岐させてある。このフローセル１の一方
の流路１ａには、第１の光源３から干渉フィルタ４を経
て得られる特定の波長３１３ｎｍの紫外線ＵＶが照射さ
れ、流路１ａを透過した紫外線ＵＶは第１の検出器５で
受光される。また、フローセル１の他方の流路１ｂには
、第２の光源６から回折格子７を経て得られる特定の波
長２２０９．８ｎｍの近赤外線ＮＩＲ が照射され、流
路１ｂを透過した近赤外線ＮＩＲ は第２の検出器８で
受光される。第１の検出器５で受光される紫外線ＵＶの
光量は電気信号に変換され第１のアンプ９で増幅された
後、第１のＡ／Ｄ変換器１０でデジタル信号に変換され
て演算処理装置１３に入力される。また、第２の検出器
８で受光される近赤外線ＮＩＲ の光量も電気信号に変
換され第２のアンプ１１で増幅された後、第２のＡ／Ｄ
変換器１２でデジタル信号に変換されて演算処理装置１
３に入力される。演算処理装置１３に入力される信号は
、上記紫外線ＵＶおよび近赤外線ＮＩＲ の過酸化水素
・アンモニア混合液２における透過光量を示すデータで
あり、演算処理装置１３ではこれらのデータを吸光度ｘ
１，ｘ２に変換した後、後述するアンモニア濃度換算式
および過酸化水素濃度換算式に当てはめる演算処理が行
われ、その演算結果から過酸化水素・アンモニア混合液
中の各成分の濃度が求められる。ここでは、アンモニア
濃度ｙ（ＮＨ３） を求める濃度換算式として、重回帰
分析により導出された重回帰式FIG. 1 is a schematic diagram showing the general configuration of a measurement system in which the measurement method according to the present invention is carried out. In the figure, a flow cell 1 is a conduit through which a hydrogen peroxide/ammonia mixture 2, which is a measurement sample, flows, and is branched into two flow paths 1a and 1b in the middle. One channel 1a of the flow cell 1 is irradiated with ultraviolet rays of a specific wavelength of 313 nm obtained from a first light source 3 through an interference filter 4, and the ultraviolet rays that have passed through the channel 1a are sent to a first detector. The light is received at 5. Further, the other channel 1b of the flow cell 1 is irradiated with near-infrared NIR with a specific wavelength of 2209.8 nm obtained from the second light source 6 via the diffraction grating 7, and the near-infrared NIR transmitted through the channel 1b is The light is received by the second detector 8. The amount of UV light received by the first detector 5 is converted into an electrical signal, amplified by the first amplifier 9, and then converted into a digital signal by the first A/D converter 10, which is then converted to a digital signal by the arithmetic processing unit. 13. Furthermore, the amount of near-infrared NIR light received by the second detector 8 is also converted into an electrical signal, which is amplified by the second amplifier 11 and then sent to the second A/D.
It is converted into a digital signal by the converter 12 and sent to the arithmetic processing unit 1.
3 is input. The signal input to the processing unit 13 is data indicating the amount of light transmitted through the hydrogen peroxide/ammonia mixture 2 of the ultraviolet UV and near-infrared NIR, and the processing unit 13 converts these data into absorbance x
1, x2, arithmetic processing is performed to apply the ammonia concentration conversion formula and hydrogen peroxide concentration conversion formula to be described later, and the concentration of each component in the hydrogen peroxide/ammonia mixture is determined from the calculation results. Here, as the concentration conversion formula for calculating the ammonia concentration y (NH3), we use the multiple regression formula derived by multiple regression analysis.
【００１９】[0019]
【数１】[Math 1]
【００２０】が適用される。数１で表されるアンモニア
濃度換算式は上記フローセル１における紫外線ＵＶの吸
光度ｘ１および近赤外線ＮＩＲ の吸光度ｘ２をそれぞ
れ説明変数、アンモニア濃度ｙ（ＮＨ３） を目的変数
とする重回帰式であって、次の表１に示す重回帰分析の
結果、[0020] is applied. The ammonia concentration conversion formula expressed by Equation 1 is a multiple regression equation in which the ultraviolet UV absorbance x1 and the near-infrared NIR absorbance x2 in the flow cell 1 are explanatory variables, and the ammonia concentration y (NH3) is the objective variable. The results of multiple regression analysis shown in Table 1 below,
【００２１】[0021]
【表１】[Table 1]
【００２２】説明変数ｘ１の回帰係数ａ１として−１．
３６９、説明変数ｘ２の回帰係数ａ２として１０．２０
７、定数項にあたる回帰係数ａ０として０．０４０がそ
れぞれ導出されている。また、過酸化水素濃度ｙ（Ｈ２
Ｏ２）を求める濃度換算式として、次の４つの数式が適
用される。The regression coefficient a1 of the explanatory variable x1 is -1.
369, 10.20 as regression coefficient a2 of explanatory variable x2
7. 0.040 is derived as the regression coefficient a0 corresponding to the constant term. In addition, hydrogen peroxide concentration y (H2
The following four formulas are applied as concentration conversion formulas for determining O2).
【００２３】[0023]
【数２】[Math 2]
【００２４】[0024]
【数３】[Math 3]
【００２５】[0025]
【数４】[Math 4]
【００２６】[0026]
【数５】[Math 5]
【００２７】このうち数２で表される第１の過酸化水素
濃度換算式は、上記フローセル１における紫外線の吸光
度ｘ１および近赤外線の吸光度ｘ２をそれぞれ説明変数
、過酸化水素濃度ｙ１（Ｈ２Ｏ２）を目的変数として重
回帰分析により得られた重回帰式であって、次の表２に
示す重回帰分析の結果、The first hydrogen peroxide concentration conversion formula expressed by Equation 2 uses the ultraviolet absorbance x1 and the near-infrared absorbance x2 in the flow cell 1 as explanatory variables, and the hydrogen peroxide concentration y1 (H2O2) as explanatory variables. The multiple regression equation obtained by multiple regression analysis as the objective variable, the results of the multiple regression analysis shown in Table 2 below,
【００２８】[0028]
【表２】[Table 2]
【００２９】説明変数ｘ１の回帰係数ａ１として１８．
２７３、説明変数ｘ２の回帰係数ａ２として−２．４２
７、定数項にあたる回帰係数ａ０として−０．１０７が
それぞれ導出されている。18 as regression coefficient a1 of explanatory variable x1.
273, -2.42 as regression coefficient a2 of explanatory variable x2
7. -0.107 is derived as the regression coefficient a0 corresponding to the constant term.
【００３０】この第１の過酸化水素濃度換算式は、上記
アンモニア濃度換算式で求められたアンモニア濃度が２
ｗｔ％以上で、かつ上記紫外線の吸光度つまり説明変数
ｘ１が０．１５以上のときに適用される。This first hydrogen peroxide concentration conversion formula calculates that the ammonia concentration determined by the above ammonia concentration conversion formula is 2.
wt% or more and the absorbance of the ultraviolet rays, that is, the explanatory variable x1 is 0.15 or more.
【００３１】また、数３で表される第２の過酸化水素濃
度換算式は、上記紫外線の吸光度ｘ１および近赤外線の
吸光度ｘ２をそれぞれ説明変数、過酸化水素濃度ｙ２（
Ｈ２Ｏ２）を目的変数として重回帰分析により得られた
重回帰式であって、次の表３に示す重回帰分析の結果、
The second hydrogen peroxide concentration conversion formula expressed by Equation 3 uses the above-mentioned ultraviolet absorbance x1 and near-infrared absorbance x2 as explanatory variables, and the hydrogen peroxide concentration y2 (
A multiple regression equation obtained by multiple regression analysis with H2O2) as the objective variable, and the results of the multiple regression analysis shown in Table 3 below:
【００３２】[0032]
【表３】[Table 3]
【００３３】説明変数ｘ１の回帰係数ａ１として１１．
５２９、説明変数ｘ２の回帰係数ａ２として−０．６５
４、定数項にあたる回帰係数ａ０として０．１９６がそ
れぞれ導出されている。11. As regression coefficient a1 of explanatory variable x1.
529, -0.65 as regression coefficient a2 of explanatory variable x2
4. 0.196 is derived as the regression coefficient a0 corresponding to the constant term.
【００３４】この第２の過酸化水素濃度換算式は、上記
アンモニア濃度換算式で求められたアンモニア濃度が２
ｗｔ％以上で、かつ上記紫外線の吸光度つまり説明変数
ｘ１が０．１５未満のときに適用される。This second hydrogen peroxide concentration conversion formula calculates that the ammonia concentration determined by the above ammonia concentration conversion formula is 2.
This is applied when the absorbance of ultraviolet rays, that is, the explanatory variable x1 is less than 0.15.
【００３５】また、数４で表される第３の過酸化水素濃
度換算式は、上記紫外線の吸光度ｘ１および近赤外線の
吸光度ｘ２をそれぞれ説明変数、過酸化水素濃度ｙ３（
Ｈ２Ｏ２）を目的変数として重回帰分析により得られた
重回帰式であって、次の表４に示す重回帰分析の結果、
In addition, the third hydrogen peroxide concentration conversion formula expressed by Equation 4 uses the above-mentioned ultraviolet absorbance x1 and near-infrared absorbance x2 as explanatory variables, and the hydrogen peroxide concentration y3 (
A multiple regression equation obtained by multiple regression analysis with H2O2) as the objective variable, and the results of the multiple regression analysis shown in Table 4 below:
【００３６】[0036]
【表４】[Table 4]
【００３７】説明変数ｘ１の回帰係数ａ１として２４．
２７０、説明変数ｘ２の回帰係数ａ２として−２０．５
４７、定数項にあたる回帰係数ａ０として１．６７３が
それぞれ導出されている。24 as the regression coefficient a1 of the explanatory variable x1.
270, -20.5 as regression coefficient a2 of explanatory variable x2
47, and 1.673 is derived as the regression coefficient a0 corresponding to the constant term.
【００３８】この第３の過酸化水素濃度換算式は、上記
アンモニア濃度換算式で求められたアンモニア濃度が２
ｗｔ％未満で、かつ上記紫外線の吸光度つまり説明変数
ｘ１が０．１５以上のときに適用される。This third hydrogen peroxide concentration conversion formula calculates that the ammonia concentration determined by the above ammonia concentration conversion formula is 2.
This is applied when the absorbance of ultraviolet rays, that is, the explanatory variable x1 is 0.15 or more.
【００３９】さらに、数５で表される第４の過酸化水素
濃度換算式は、上記紫外線の吸光度ｘ１および上記アン
モニア濃度換算式で求められたアンモニア濃度ｙ（ＮＨ
３） をそれぞれ説明変数、過酸化水素濃度ｙ３（Ｈ２
Ｏ２）を目的変数として非線型最小２乗法により得られ
た回帰式であって、この式の各パラメータｐ１，ｐ２，
ｐ３，ｐ４は次のように導出されている。Furthermore, the fourth hydrogen peroxide concentration conversion formula expressed by Equation 5 is based on the above ultraviolet absorbance x1 and the ammonia concentration y (NH
3) respectively as explanatory variables and hydrogen peroxide concentration y3 (H2
This is a regression equation obtained by the nonlinear least squares method with O2) as the objective variable, and each parameter p1, p2,
p3 and p4 are derived as follows.
【００４０】ｐ１： ０．１５２３ ｐ２： ０．００８０４４２ ｐ３： １．３９４８８ ｐ４： ０．０４４９２３２[0040] p1: 0.1523 p2: 0.0080442 p3: 1.39488 p4: 0.0449232
【００４１】この第４の過酸化水素濃度換算式は、上記
アンモニア濃度換算式で求められたアンモニア濃度が２
ｗｔ％未満で、かつ上記紫外線ＵＶの吸光度つまり説明
変数ｘ１が０．１５未満のときに適用される。[0041] This fourth hydrogen peroxide concentration conversion formula is used when the ammonia concentration determined by the above ammonia concentration conversion formula is 2.
It is applied when the absorbance of ultraviolet rays UV, that is, the explanatory variable x1 is less than 0.15.
【００４２】すなわち、この測定方法では、過酸化水素
濃度ｙ（Ｈ２Ｏ２）については、図２に示す４つの条件
の場合ごとに、数２，数３，数４，数５で表される互い
に異なる濃度換算式を適用することによって求められる
。That is, in this measurement method, the hydrogen peroxide concentration y (H2O2) is different from each other as expressed by Equation 2, Equation 3, Equation 4, and Equation 5 for each of the four conditions shown in FIG. It is determined by applying the concentration conversion formula.
【００４３】表５は、アンモニア濃度Ｙ（ＮＨ３） お
よび過酸化水素濃度Ｙ（Ｈ２Ｏ２）を調整して得た過酸
化水素・アンモニア混合液２の各サンプルと、これらの
サンプルに照射したときの上記紫外線ＵＶの吸光度ｘ１
および上記近赤外線ＮＩＲ の吸光度ｘ２のデータとを
対応付けて示したものである。ただし、この場合の紫外
線ＵＶおよび近赤外線ＮＩＲ の吸光度ｘ１，ｘ２は、
水の透過率を１００％、光路長を１ｍｍとして測定して
いる。Table 5 shows each sample of hydrogen peroxide/ammonia mixture 2 obtained by adjusting the ammonia concentration Y (NH3) and hydrogen peroxide concentration Y (H2O2), and the above-mentioned results when these samples were irradiated. Ultraviolet UV absorbance x1
and the above-mentioned near-infrared NIR absorbance x2 data are shown in association with each other. However, in this case, the absorbances x1 and x2 of ultraviolet UV and near-infrared NIR are as follows:
Measurements were made with water transmittance at 100% and optical path length at 1 mm.
【００４４】[0044]
【表５】[Table 5]
【００４５】表６は、調整されたサンプルのアンモニア
濃度Ｙ（ＮＨ３） と、実測された紫外線ＵＶおよび近
赤外線ＮＩＲ の吸光度ｘ１，ｘ２を数１で表されるア
ンモニア濃度換算式に当てはめて求めたアンモニア濃度
の試算値ｙ（ＮＨ３） と、その誤差Δｙとを示したも
のである。[0045] Table 6 shows the ammonia concentration Y (NH3) of the adjusted sample and the actually measured ultraviolet UV and near-infrared NIR absorbances x1 and x2, which were calculated by applying them to the ammonia concentration conversion formula expressed by Equation 1. This figure shows the trial value y(NH3) of ammonia concentration and its error Δy.
【００４６】[0046]
【表６】[Table 6]
【００４７】この表６から明らかなように、上記アンモ
ニア濃度換算式は実際のアンモニア濃度をよく表してい
ることが分かる。As is clear from Table 6, the ammonia concentration conversion formula described above represents the actual ammonia concentration well.
【００４８】表７は、調整されたサンプルの過酸化水素
濃度Ｙ１（Ｈ２Ｏ２）と、実測された紫外線ＵＶおよび
近赤外線ＮＩＲ の吸光度ｘ１，ｘ２を第１の過酸化水
素濃度換算式に当てはめて求めた過酸化水素濃度の試算
値ｙ１（Ｈ２０２）と、その誤差Δｙ１とを示したもの
である。Table 7 shows the hydrogen peroxide concentration Y1 (H2O2) of the adjusted sample and the actually measured ultraviolet UV and near-infrared NIR absorbances x1 and x2, which are calculated by applying them to the first hydrogen peroxide concentration conversion formula. 2 shows the estimated value y1 (H202) of the hydrogen peroxide concentration and its error Δy1.
【００４９】[0049]
【表７】
この表７から明らかなように、上記第１の過酸化水素濃
度換算式は実際の過酸化水素濃度をよく表していること
が分かる。[Table 7] As is clear from Table 7, the first hydrogen peroxide concentration conversion formula well represents the actual hydrogen peroxide concentration.
【００５０】表８は、調整されたサンプルの酸化水素濃
度Ｙ２（Ｈ２Ｏ２）と、実測された紫外線ＵＶおよび近
赤外線ＮＩＲ の吸光度ｘ１，ｘ２を第２の過酸化水素
濃度換算式に当てはめて求めた過酸化水素濃度の試算値
ｙ２（Ｈ２Ｏ２）と、その誤差Δｙ２とを示したもので
ある。[0050] Table 8 shows the hydrogen oxide concentration Y2 (H2O2) of the adjusted sample and the actually measured ultraviolet UV and near-infrared NIR absorbances x1 and x2, which were calculated by applying them to the second hydrogen peroxide concentration conversion formula. It shows the estimated hydrogen peroxide concentration value y2 (H2O2) and its error Δy2.
【００５１】[0051]
【表８】
この表８から明らかなように、上記第２の過酸化水素濃
度換算式は実際の過酸化水素濃度をよく表していること
が分かる。[Table 8] As is clear from Table 8, the second hydrogen peroxide concentration conversion formula well represents the actual hydrogen peroxide concentration.
【００５２】表９は、実測された紫外線および近赤外線
の吸光度ｘ１，ｘ２を第３の過酸化水素濃度換算式に当
てはめて求めた過酸化水素濃度の試算値ｙ３（Ｈ２Ｏ２
）と、調整されたサンプルの過酸化水素濃度Ｙ３（Ｈ２
Ｏ２）と、その誤差Δｙ３とを示したものである。Table 9 shows the estimated hydrogen peroxide concentration y3 (H2O2
) and the hydrogen peroxide concentration Y3 (H2
02) and its error Δy3.
【００５３】[0053]
【表９】[Table 9]
【００５４】この表９から明らかなように、上記第３の
過酸化水素濃度換算式は実際の過酸化水素濃度をよく表
していることが分かる。As is clear from Table 9, the third hydrogen peroxide concentration conversion formula well represents the actual hydrogen peroxide concentration.
【００５５】表１０は、実測された紫外線の吸光度ｘ１
と数１で表される濃度換算式で求められたアンモニア濃
度ｙ（ＮＨ３） とを、第４の過酸化水素濃度換算式に
当てはめて求めた過酸化水素濃度の試算値ｙ４（Ｈ２Ｏ
２）と、調整されたサンプルの過酸化水素濃度Ｙ４（Ｈ
２Ｏ２）とを比較して示したものである。Table 10 shows the actually measured ultraviolet absorbance x1
and the ammonia concentration y (NH3) obtained using the concentration conversion formula expressed by Equation 1, and the estimated hydrogen peroxide concentration y4 (H2O
2) and the hydrogen peroxide concentration Y4 (H
2O2).
【００５６】[0056]
【表１０】[Table 10]
【００５７】この表１０から明らかなように、上記第４
の過酸化水素濃度換算式は実際の過酸化水素濃度をよく
表していることが分かる。As is clear from Table 10, the fourth
It can be seen that the hydrogen peroxide concentration conversion formula represents the actual hydrogen peroxide concentration well.
【００５８】なお、上記実施例では、過酸化水素濃度を
求める濃度換算式を差し替えて使用するための境界値と
して、アンモニア濃度を２ｗｔ％，紫外線ＵＶの吸光度
を０．１５としたが、アンモニア濃度については１．７
ｗｔ％から２．３ｗｔ％までの範囲内の値であれば、ほ
ぼ同等の結果を得ることができる。また、紫外線ＵＶの
吸光度については、フローセル１のセル長など他の条件
によって値が異なるので、条件に応じて適当な値を境界
値として設定すればよい。In the above example, the ammonia concentration was set to 2 wt% and the absorbance of ultraviolet rays was set to 0.15 as boundary values for replacing and using the concentration conversion formula for determining the hydrogen peroxide concentration. 1.7 for
Approximately equivalent results can be obtained if the value is within the range of wt% to 2.3wt%. Furthermore, since the value of the absorbance of ultraviolet rays varies depending on other conditions such as the cell length of the flow cell 1, an appropriate value may be set as a boundary value depending on the conditions.
【００５９】また、上記実施例では紫外線ＵＶとして、
波長が３１３ｎｍのものを使用した場合を示したが、図
５に示す実験結果から明らかなように、３００ｎｍ付近
であれば多少波長が異なっても同様の結果を得ることが
できる。すなわち、図５のグラフは過酸化水素・アンモ
ニア混合液の各成分比の４つのサンプルについて、紫外
線の吸収スペクトルを示したものであり、■のグラフは
過酸化水素濃度が１．００ｗｔ％でアンモニア濃度が１
．０１ｗｔ％の場合、■のグラフは過酸化水素濃度が１
．００ｗｔ％でアンモニア濃度が５．０３ｗｔ％の場合
、■のグラフは過酸化水素濃度が５．００ｗｔ％でアン
モニア濃度が１．０１ｗｔ％の場合、■のグラフは過酸
化水素濃度が５．００ｗｔ％でアンモニア濃度が５．０
３の場合をそれぞれ示している。ただし、このときの測
定セルの長さ、つまり吸光度測定の光路長は２ｎｍで、
分光光度計を用いて測定したものである。近赤外線ＮＩ
Ｒ の波長の場合も、実施例の波長２２０９．８ｎｍの
他に、例えば１５３０ｎｍの波長を用いて同様の結果を
得ることができる。Furthermore, in the above embodiment, as ultraviolet rays UV,
Although the case where a wavelength of 313 nm is used is shown, as is clear from the experimental results shown in FIG. 5, similar results can be obtained even if the wavelength is slightly different as long as it is around 300 nm. In other words, the graph in Figure 5 shows the absorption spectra of ultraviolet rays for four samples of each component ratio of the hydrogen peroxide/ammonia mixture. concentration is 1
．． In the case of 01 wt%, the graph of ■ indicates that the hydrogen peroxide concentration is 1
．． 00 wt% and the ammonia concentration is 5.03 wt%, the graph ■ is 5.00 wt%, and the ammonia concentration is 1.01 wt%, the graph ■ is 5.00 wt% hydrogen peroxide concentration. and the ammonia concentration is 5.0
3 cases are shown respectively. However, the length of the measurement cell at this time, that is, the optical path length for absorbance measurement, is 2 nm.
This was measured using a spectrophotometer. Near infrared NI
In the case of the wavelength R, similar results can be obtained by using, for example, a wavelength of 1530 nm in addition to the wavelength of 2209.8 nm in the example.
【発明の効果】本発明は、上述した構成より成り、アン
モニア濃度については、特定波長の紫外線の吸光度およ
び特定波長の近赤外線の吸光度をそれぞれ説明変数とす
る重回帰式の濃度換算式から求め、過酸化水素濃度につ
いては、前記アンモニア濃度換算式から求めた濃度が予
め定めた値α（ただし、αは１．７から２．３までの範
囲内の値）ｗｔ％以上で紫外線の吸光度が予め定めた値
β以上の条件、アンモニア濃度換算式による濃度が上記
値αｗｔ％以上で紫外線の吸光度が上記値β未満の条件
、アンモニア濃度換算式による濃度が上記値αｗｔ％未
満で紫外線の吸光度が上記値β以上の条件、アンモニア
濃度換算式による濃度が上記値αｗｔ％未満で紫外線の
吸光度が上記値β未満の条件の各場合に分け、各条件ご
とに別々の回帰式の過酸化水素濃度換算式を導出してそ
れぞれの換算式から求めるようにしているので、簡単な
構成の測定系により、広い濃度範囲にわたって各成分の
濃度を簡単かつ正確に測定できる。Effects of the Invention The present invention has the above-mentioned configuration, in which the ammonia concentration is determined from a concentration conversion formula of a multiple regression formula in which the absorbance of ultraviolet rays at a specific wavelength and the absorbance of near-infrared rays at a specific wavelength are used as explanatory variables, respectively. Regarding the hydrogen peroxide concentration, if the concentration calculated from the ammonia concentration conversion formula is above a predetermined value α (however, α is a value within the range of 1.7 to 2.3) wt%, the absorbance of ultraviolet rays is determined in advance. Conditions where the concentration according to the ammonia concentration conversion formula is above the above value αwt% and the absorbance of ultraviolet rays is less than the above value β, conditions when the concentration according to the ammonia concentration conversion formula is less than the above value αwt% and the absorbance of ultraviolet rays is above the above value Separate conditions for conditions where the ammonia concentration conversion formula is equal to or higher than the above value αwt%, and conditions where the ultraviolet absorbance is less than the above value β, and create a hydrogen peroxide concentration conversion formula using a separate regression equation for each condition. Since the concentration of each component is derived and determined from each conversion formula, the concentration of each component can be easily and accurately measured over a wide concentration range using a measurement system with a simple configuration.
【図１】本発明の実施例に用いられる測定系の概略的な
構成を示す模式図である。FIG. 1 is a schematic diagram showing the general configuration of a measurement system used in an example of the present invention.
【図２】各過酸化水素濃度換算式に対応付けられる条件
の領域区分を模式的に示す図である。FIG. 2 is a diagram schematically showing area divisions of conditions associated with each hydrogen peroxide concentration conversion formula.
【図３】過酸化水素・アンモニア混合液に波長２２０９
．８ｎｍの近赤外線を照射したときのアンモニア濃度と
近赤外線の吸光度との関係を示すグラフである。[Figure 3] Wavelength 2209 for hydrogen peroxide/ammonia mixture
．． It is a graph showing the relationship between ammonia concentration and near-infrared absorbance when 8 nm near-infrared rays are irradiated.
【図４】過酸化水素・アンモニア混合液に波長３１２．
６ｎｍの紫外線を照射したときのアンモニア濃度と紫外
線の吸光度との関係を示すグラフである。[Figure 4] Hydrogen peroxide/ammonia mixture has a wavelength of 312.
It is a graph showing the relationship between the ammonia concentration and the absorbance of ultraviolet rays when 6 nm ultraviolet rays are irradiated.
【図５】成分比の異なる過酸化水素・アンモニア混合液
の各サンプルについて、紫外線の吸収スペクトルを示し
た図である。FIG. 5 is a diagram showing the absorption spectra of ultraviolet rays for samples of hydrogen peroxide/ammonia mixtures having different component ratios.
２ 過酸化水素・アンモニア混合液 ＵＶ 紫外線 ＮＩＲ 近赤外線 2. Hydrogen peroxide/ammonia mixture UV ultraviolet light NIR Near infrared rays
Claims (1)
成分の濃度を、その混合液に照射した特定波長光の吸光
度から求める成分濃度測定方法において、アンモニア濃
度については、特定波長の紫外線の吸光度および特定波
長の近赤外線の吸光度をそれぞれ説明変数として得られ
る重回帰式をアンモニア濃度換算式として求め、過酸化
水素濃度については、前記アンモニア濃度換算式から求
めた濃度が予め定めた値α（ただし、αは１．７から２
．３までの範囲内の値）ｗｔ％以上でかつ特定波長の紫
外線の吸光度が予め定めた値β以上である第１の条件、
前記アンモニア濃度換算式から求めた濃度が前記値αｗ
ｔ％以上でかつ特定波長の紫外線の吸光度が前記値β未
満である第２の条件、前記アンモニア濃度換算式から求
めた濃度が前記値αｗｔ％未満でかつ特定波長の紫外線
の吸光度が前記値β以上である第３の条件、前記アンモ
ニア濃度換算式から求めた濃度が前記値αｗｔ％未満で
かつ特定波長の紫外線の吸光度が前記値β未満である第
４の条件の各場合に分け、第１、第２、第３の条件の場
合には前記紫外線の吸光度および近赤外線の吸光度をそ
れぞれ説明変数として各条件で得られる重回帰式をそれ
ぞれ第１，第２，第３の過酸化水素濃度換算式として求
め、第４の条件の場合には前記アンモニア濃度換算式か
ら求めた濃度および前記紫外線の吸光度をそれぞれ説明
変数として非線型最小２乗処理から得られる回帰式を第
４の過酸化水素濃度換算式として求めることを特徴とす
る過酸化水素・アンモニア混合液の成分濃度測定方法。Claim 1: In a component concentration measurement method in which the concentration of each component in a hydrogen peroxide/ammonia mixture is determined from the absorbance of light of a specific wavelength irradiated to the mixture, the ammonia concentration is determined by the absorbance of ultraviolet light of a specific wavelength. A multiple regression equation obtained as explanatory variables is the absorbance of near-infrared light of a specific wavelength, and the absorbance of near-infrared rays at a specific wavelength is determined as an ammonia concentration conversion formula.For the hydrogen peroxide concentration, the concentration calculated from the ammonia concentration conversion formula , α is 1.7 to 2
．． 3) wt% or more and the absorbance of ultraviolet rays of a specific wavelength is a predetermined value β or more,
The concentration obtained from the ammonia concentration conversion formula is the value αw
t% or more and the absorbance of ultraviolet rays at a specific wavelength is less than the value β; the concentration calculated from the ammonia concentration conversion formula is less than the value αwt% and the absorbance of ultraviolet rays at a specific wavelength is the value β; The third condition is the above, and the fourth condition is that the concentration calculated from the ammonia concentration conversion formula is less than the value αwt% and the absorbance of ultraviolet rays at a specific wavelength is less than the value β. , in the case of the second and third conditions, the multiple regression equation obtained under each condition is converted into the first, second, and third hydrogen peroxide concentration using the ultraviolet absorbance and near-infrared absorbance as explanatory variables, respectively. In the case of the fourth condition, the concentration obtained from the ammonia concentration conversion formula and the absorbance of the ultraviolet rays are respectively used as explanatory variables, and a regression equation obtained from nonlinear least squares processing is used as the fourth hydrogen peroxide concentration. A method for measuring the component concentration of a hydrogen peroxide/ammonia mixture, characterized by determining it as a conversion formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41607590A JP2838235B2 (en) | 1990-12-29 | 1990-12-29 | Component concentration measurement method for hydrogen peroxide / ammonia mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41607590A JP2838235B2 (en) | 1990-12-29 | 1990-12-29 | Component concentration measurement method for hydrogen peroxide / ammonia mixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04249748A true JPH04249748A (en) | 1992-09-04 |
| JP2838235B2 JP2838235B2 (en) | 1998-12-16 |
Family
ID=18524322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP41607590A Expired - Fee Related JP2838235B2 (en) | 1990-12-29 | 1990-12-29 | Component concentration measurement method for hydrogen peroxide / ammonia mixture |
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| Country | Link |
|---|---|
| JP (1) | JP2838235B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075341A (en) * | 2001-09-04 | 2003-03-12 | Japan Science & Technology Corp | Method for measuring dissolved/suspensible substance concentration by near infrared spectroscopy |
| JP2007024572A (en) * | 2005-07-13 | 2007-02-01 | Kurabo Ind Ltd | Fatigue degree evaluation method of alkali aqueous solution |
| CN102759514A (en) * | 2011-04-28 | 2012-10-31 | 天津天士力之骄药业有限公司 | Determination method for content of total saponins of panax ginseng in qi-tonifying pulse-restoring preparation for injection |
| JP2015068754A (en) * | 2013-09-30 | 2015-04-13 | 株式会社日立ハイテクノロジーズ | Detector for liquid chromatograph |
| JP2020128940A (en) * | 2019-02-08 | 2020-08-27 | アズビル株式会社 | Measurement device, measurement system, and measurement method |
| CN116297268A (en) * | 2023-03-03 | 2023-06-23 | 浙江大学 | Method for simultaneously detecting concentration of ammonia gas and concentration of water vapor on line |
-
1990
- 1990-12-29 JP JP41607590A patent/JP2838235B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075341A (en) * | 2001-09-04 | 2003-03-12 | Japan Science & Technology Corp | Method for measuring dissolved/suspensible substance concentration by near infrared spectroscopy |
| JP2007024572A (en) * | 2005-07-13 | 2007-02-01 | Kurabo Ind Ltd | Fatigue degree evaluation method of alkali aqueous solution |
| CN102759514A (en) * | 2011-04-28 | 2012-10-31 | 天津天士力之骄药业有限公司 | Determination method for content of total saponins of panax ginseng in qi-tonifying pulse-restoring preparation for injection |
| JP2015068754A (en) * | 2013-09-30 | 2015-04-13 | 株式会社日立ハイテクノロジーズ | Detector for liquid chromatograph |
| JP2020128940A (en) * | 2019-02-08 | 2020-08-27 | アズビル株式会社 | Measurement device, measurement system, and measurement method |
| CN116297268A (en) * | 2023-03-03 | 2023-06-23 | 浙江大学 | Method for simultaneously detecting concentration of ammonia gas and concentration of water vapor on line |
| CN116297268B (en) * | 2023-03-03 | 2023-11-03 | 浙江大学 | Method for simultaneously detecting concentration of ammonia gas and concentration of water vapor on line |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2838235B2 (en) | 1998-12-16 |
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