CN110082374A - A kind of new old identification method of tealeaves - Google Patents
A kind of new old identification method of tealeaves Download PDFInfo
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- CN110082374A CN110082374A CN201910428325.2A CN201910428325A CN110082374A CN 110082374 A CN110082374 A CN 110082374A CN 201910428325 A CN201910428325 A CN 201910428325A CN 110082374 A CN110082374 A CN 110082374A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20091—Measuring the energy-dispersion spectrum [EDS] of diffracted radiation
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Abstract
The present invention discloses a kind of new old identification method of tealeaves, the energy for testing and analyzing cosmogenic radionuclide Be-7 transmitting in Tea Samples is the gamma-ray characteristic energy peak net area of 477.6keV, and the specific activity of Be-7 is calculated according to the product value of washing one's face, qualitatively or quantitatively to determine the new old of tealeaves further according to the specific activity of Be-7 in Tea Samples.The method of the present invention is simple and fast to test sample treatment process, any chemical treating process is not needed, it whether can be that old tea qualitatively judges to tealeaves, can also newly picked and processed tea leaves to Tea Samples and old tea mixed proportion carry out quantitative analysis, and Tea Samples can not be added with Be-7 manually to influence testing result, therefore the method for the present invention can science, it is easy, reliably determine that tealeaves is newly picked and processed tea leaves or old tea, and newly old tea mixed proportion, it is practical by multiple authentication.
Description
Technical field
The present invention relates to a kind of identification methods, and in particular to a kind of new old identification method of tealeaves.
Background technique
Tealeaves mostly with the newly picked and processed tea leaves of current year collection of material be it is excellent, storage be then old tea, the quality of old tea, sense organ, warp to next year
Ji value will be greatly reduced.Though however the preferable tealeaves of some storage conditions be old tea, difference is minimum compared with newly picked and processed tea leaves, it is difficult to
Distinguish, be easy to pretend to be newly picked and processed tea leaves to make profit, it is therefore desirable to it is a kind of science, quickly and accurately method identify tealeaves it is new old.
The new old identification method of current tealeaves has: naked eyes evaluation method, characteristic flavor compounds identification method.Naked eyes evaluation method it is excellent
Point is that speed is fast, the disadvantage is that this method can not quantify to determine, veteran teacher of the sampling tea needs long time cultivation.Characteristic perfume at
Point identification method is a kind of quantization method, but the extraction of fragrance component and detection process are cumbersome, want to device configuration, analytical technology
It asks higher, and is affected by tealeaves storage condition.
Summary of the invention
The object of the present invention is to provide a kind of new old identification methods of tealeaves, so as to solve the deficiencies in the prior art.
The invention adopts the following technical scheme:
A kind of new old identification method of tealeaves, tests and analyzes the energy of cosmogenic radionuclide Be-7 transmitting in Tea Samples
For the gamma-ray characteristic energy peak net area of 477.6keV, and the specific activity of Be-7 is calculated according to the product value of washing one's face, further according to
The specific activity of Be-7 qualitatively or quantitatively to determine the new old of tealeaves in Tea Samples.
Further, it qualitatively judges the new old of tealeaves: determining if the specific activity for not detecting Be-7 in Tea Samples
Tea Samples be old tea, on the contrary it is then for dew tea or newly old tea blend；
Qualitatively judge dew tea or new old tea blend:
The baseline value of the specific activity of Be-7, measurement is obtained when establishing Tea Samples place producing region kind Tea Production
The specific activity of Tea Samples Be-7 is corrected to it according to the radioactive index attenuation law of Be-7 and demarcates the date of manufacture, raw with tealeaves
The baseline value of the specific activity of Be-7, which is compared, when production determine dew tea or new old tea blend ratio；
Or when establishing producing region kind Tea Production where Tea Samples the specific activity of Be-7 baseline value, according to Be-7
Radioactive index attenuation law be corrected to current time, the specific activity of Tea Samples Be-7 that measurement is obtained by comparison into
Row determines dew tea or new old tea blend ratio；
Or the specific activity of the producing region current Be-7 of the dew tea of the kind tealeaves where measurement Tea Samples, measurement is obtained
The specific activity of Tea Samples Be-7 carries out determining dew tea or new old tea blend ratio by comparison.
Further, tealeaves is green tea.
Further, the energy for testing and analyzing cosmogenic radionuclide Be-7 transmitting in Tea Samples is the γ of 477.6keV
The characteristic energy peak net area of ray, includes the following steps:
1) appropriate Tea Samples to be measured, are taken, are pulverized and sieved, detection is uniformly packed into and is sealed with sample box；
2) sample box equipped with Tea Samples, is put into gamma energy spectrometer measurement position, time of measuring is according to Be-7 transmitting
Energy be 477.6keV gamma-ray characteristic energy peak peak area counts statistical error is less than 10% or longest counts for 24 hours；
3) the net of the gamma-ray characteristic energy peak that the energy that Be-7 emits in sample analysis map is 477.6keV, is calculated
Area.
Further, step 1) Tea Samples are crushed to 40~60 mesh.
Further, step 2) gamma energy spectrometer is HpGe gamma energy spectrometer.
Further, it is calculated Be-7's by net area according to the atlas analysis method of GB/T 16145-1995 standard
Specific activity.
Further, the new Chen Jinhang of tealeaves is identified in 7 months after the Tea Production phase.
Beneficial effects of the present invention:
The present invention utilizes radionuclide decay characteristic, passes through the ratio of the raw natural radionuclide Be-7 of space in detection tealeaves
Activity, to judge the new old of tealeaves.The method of the present invention is simple and fast to test sample treatment process, does not need at any chemistry
Whether reason process can be that old tea qualitatively judges to tealeaves, can also newly picked and processed tea leaves to Tea Samples and old tea mixed proportion determine
Amount analysis, and can not Tea Samples manually be added with Be-7 to influence testing result, therefore the method for the present invention being capable of science, letter
Just, reliably determine that tealeaves is newly picked and processed tea leaves or old tea, and newly old tea mixed proportion, it is practical by multiple authentication.
Detailed description of the invention
Fig. 1 is the spectrogram that embodiment 1 measures the specific activity of Be-7 in tealeaves using HpGe gamma energy spectrometer.
Fig. 2 is the exponential trend line fitting of four measurement result values of specific activity of the Be-7 nucleic in 1 newly picked and processed tea leaves of embodiment.
Fig. 3 is that new, old tea is quasi- by the specific activity and its linear trend of the Be-7 of different proportion mixing sample in embodiment 2
It closes.
Specific embodiment
The present invention is done below with reference to embodiment and attached drawing and is further explained.The following example is merely to illustrate this hair
It is bright, but be not used to limit practical range of the invention.
Be-7 (beryllium) be cosmogenic radionuclide, earth's surface is dropped to by continuity dried wet deposition, be widely present in air,
It in soil, water, and then is retained and absorbs by herbosa, for example vegetables, flowers and trees etc. are harmless.Equally also absorbed by tealeaves.
Fresh tea leaf stops absorbing Be-7 after being picked, and the process of manufacturing will not influence the content of the nucleic.The decay of Be-7 nucleic and active
Emitted energy is the gamma-rays of 477.6keV, and half-life period is 53.3 days, about 6.85 half-life period of one-year age, 1 year old tea
The specific activity of Be-7 nucleic is the 1/115 of newly picked and processed tea leaves, the substantially below lowest limit of detection of instrument, the difference pole of newly picked and processed tea leaves and old tea in leaf
It is significant.Wherein specific activity (specific activity), also referred to as specific activity, refer to radioactive source radioactive activity and its
Mass ratio, i.e., the radioactive activity of certain contained nucleic in unit mass product.Therefore pass through radioactive nucleus in detection tealeaves
The specific activity of plain Be-7 carries out determining new old tea, is very reliable.
A kind of new old identification method of tealeaves, includes the following steps:
Step 1: the γ that the energy for testing and analyzing cosmogenic radionuclide Be-7 transmitting in Tea Samples is 477.6keV is penetrated
The characteristic energy peak net area of line:
1) appropriate Tea Samples to be measured, are taken, the sieving of 40~60 mesh is crushed to, detection is uniformly packed into and is sealed with sample box；
2) sample box equipped with Tea Samples, is put into HpGe (HPGe) gamma energy spectrometer measurement position, time of measuring according to
Energy according to Be-7 transmitting be the gamma-ray characteristic energy peak peak area counts statistical error of 477.6keV less than 10% or most
Length counts for 24 hours；
3) the net of the gamma-ray characteristic energy peak that the energy that Be-7 emits in sample analysis map is 477.6keV, is calculated
Area.
Step 2: living according to the ratio that the atlas analysis method of GB/T 16145-1995 standard calculates Be-7 by product value of washing one's face
Degree.
Step 3: qualitatively or quantitatively determining the new old of tealeaves according to the specific activity of Be-7 in Tea Samples:
Qualitatively judge tealeaves it is new old: if do not detected in Tea Samples Be-7 specific activity (its value be less than HpGe
Specific activity lowest limit of detection of the gamma energy spectrometer to Be-7) then determine that Tea Samples are old tea, it is on the contrary then for dew tea or new old mix
Close tea；
Qualitatively judge dew tea or new old tea blend, specific activity value size and Tea Samples based on Be-7 in Tea Samples
Middle newly picked and processed tea leaves accounting has reliable linear relationship:
The baseline value of the specific activity of Be-7, measurement is obtained when establishing Tea Samples place producing region kind Tea Production
The specific activity of Tea Samples Be-7 is corrected to it according to the radioactive index attenuation law of Be-7 and demarcates the date of manufacture, raw with tealeaves
The baseline value of the specific activity of Be-7, which is compared, when production determine dew tea or new old tea blend ratio；
Or when establishing producing region kind Tea Production where Tea Samples the specific activity of Be-7 baseline value, according to Be-7
Radioactive index attenuation law be corrected to current time, the specific activity of Tea Samples Be-7 that measurement is obtained by comparison into
Row determines dew tea or new old tea blend ratio；
Or the specific activity of the producing region current Be-7 of the dew tea of the kind tealeaves where measurement Tea Samples, measurement is obtained
The specific activity of Tea Samples Be-7 carries out determining dew tea or new old tea blend ratio by comparison.
The method of the present invention only do qualitatively judge Tea Samples whether be pure old tea detection, take 10g or so Tea Samples i.e.
It can；When quantitative analysis, the minimum dosages of Tea Samples can according to the A1 formula of GB/T 16145-1995 normative annex A into
Row estimation, required sample size is general consistent with laboratory accepted standard body source in actually detected, generallys use
Cylindrical sample box fills the sample box and at least needs sample size 50g；If HpGe gamma energy spectrometer is configured with passive efficiency quarter
Function is spent, sample size is adjustable.
The method of the present invention can be used for the new old qualitative or quantitative identification of tealeaves, especially green tea, in Tea Production (picking) after the phase
7 months (4 half-life period of Be-7) in new Chen Jinhang of tealeaves is identified it is more particularly suitable.
The HpGe gamma energy spectrometer that following embodiment is used is the production of U.S. Canberra (Canberra) company, model of popping one's head in
For BE5030, sample box isCylindrical sample box, it is 80000 seconds that sample, which is put into HpGe gamma energy spectrometer time of measuring,.
Embodiment 1: the specific activity decay of the Be-7 in newly picked and processed tea leaves, which is reduced, meets Decay Law
The Xihu Longjing Tea newly picked and processed tea leaves of frying on March 23 in 2018 sample 50g, measure on March 27th, 2018, sample point
Map is analysed as shown in Figure 1, the sample is primary at interval of 53 days remeasurements, measurement 4 times end values are shown in Table 1 altogether, end value
Fig. 2, R are shown in the fitting of exponential trend line2Value is 0.9843, it was demonstrated that measured data and Be-7 cooling rule are coincide very much.
Table 1 2018 years newly picked and processed tea leaves samples, 4 measurement results
Embodiment 2: the linear relationship of newly picked and processed tea leaves accounting and the specific activity testing result of Be-7 is clear in mixing sample
With the West Lake in 2018 on Xihu Longjing Tea newly picked and processed tea leaves in 2019 (frying on March 23 in 2019) and same tea ground dragon
The old tea of well (frying on March 23 in 2018) sample preparation, newly picked and processed tea leaves accounting is respectively the 6 of 100%, 80%, 60%, 40%, 20%, 0%
A sample, 2 to 11 April in 2019 measures the specific activity of Be-7 therein and does linear trend, as shown in figure 3, R2Value
It is 0.9875, it was demonstrated that the linear relationship between newly picked and processed tea leaves accounting and the specific activity of Be-7 is reliable.
As seen from the above embodiment, because of the exponential damping characteristic of Be-7, its specific activity is high in newly picked and processed tea leaves, in HpGe γ energy
It is shown in spectrometer clearly, and the radionuclide decays are to extremely low level, substantially below HpGe γ in 1 year or more old tea
The minimum detectability of energy disperse spectroscopy, so can be using the characteristic as the other characteristic index of the new Chen Jian of tealeaves.Further can also
Pass through the mixed proportion of the comparative analysis newly picked and processed tea leaves and old tea of measured value and baseline value.
Claims (8)
1. a kind of new old identification method of tealeaves, which is characterized in that test and analyze cosmogenic radionuclide Be-7 in Tea Samples
The energy of transmitting is the gamma-ray characteristic energy peak net area of 477.6keV, and living according to the ratio that the product value of washing one's face calculates Be-7
Degree qualitatively or quantitatively to determine the new old of tealeaves further according to the specific activity of Be-7 in Tea Samples.
2. the new old identification method of tealeaves according to claim 1, which is characterized in that qualitatively judge the new old of tealeaves: such as
Do not detected in fruit Tea Samples the specific activity of Be-7 then determine Tea Samples be old tea, on the contrary it is then for dew tea or newly old mixing
Tea；
Qualitatively judge dew tea or new old tea blend:
The baseline value of the specific activity of Be-7, the tealeaves that measurement is obtained when establishing Tea Samples place producing region kind Tea Production
The specific activity of sample Be-7 is corrected to it according to the radioactive index attenuation law of Be-7 and demarcates the date of manufacture, when with Tea Production
The baseline value of the specific activity of Be-7, which is compared, determine dew tea or new old tea blend ratio；
Or when establishing producing region kind Tea Production where Tea Samples the specific activity of Be-7 baseline value, according to putting for Be-7
It penetrates sex index attenuation law and is corrected to current time, the specific activity for the Tea Samples Be-7 that measurement obtains is sentenced by comparison
Fixed dew tea or new old tea blend ratio；
Or the specific activity of the producing region current Be-7 of the dew tea of the kind tealeaves where measurement Tea Samples, the tealeaves that measurement is obtained
The specific activity of sample Be-7 carries out determining dew tea or new old tea blend ratio by comparison.
3. the new old identification method of tealeaves according to claim 1 or 2, which is characterized in that tealeaves is green tea.
4. the new old identification method of tealeaves according to claim 1 or 2, which is characterized in that test and analyze in Tea Samples
The energy of cosmogenic radionuclide Be-7 transmitting is the gamma-ray characteristic energy peak net area of 477.6keV, including walks as follows
It is rapid:
1) appropriate Tea Samples to be measured, are taken, are pulverized and sieved, detection is uniformly packed into and is sealed with sample box；
2) sample box equipped with Tea Samples, is put into gamma energy spectrometer measurement position, energy of the time of measuring according to Be-7 transmitting
It is counted for 24 hours for the gamma-ray characteristic energy peak peak area counts statistical error of 477.6keV less than 10% or longest；
3) the gamma-ray characteristic energy peak that the energy for, calculating Be-7 transmitting in sample analysis map is 477.6keV is washed one's face
Product.
5. according to the new old identification method of tealeaves according to claim 4, which is characterized in that step 1) Tea Samples crush
To 40~60 mesh.
6. according to the new old identification method of tealeaves according to claim 4, which is characterized in that step 2) gamma energy spectrometer is height
Pure germanium gamma energy spectrometer.
7. the new old identification method of tealeaves according to claim 1 or 2, which is characterized in that according to GB/T16145-1995
The specific activity of Be-7 is calculated by net area for the atlas analysis method of standard.
8. the new old identification method of tealeaves according to claim 1 or 2, which is characterized in that 7 after the Tea Production phase
The new Chen Jinhang of tealeaves is identified in month.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778553A (en) * | 2012-08-01 | 2012-11-14 | 北京师范大学 | Experimental device and method for measuring vertical distribution of beryllium-7 activity in soil profile |
| CN103048313A (en) * | 2013-01-12 | 2013-04-17 | 北京中防昊通科技中心 | Method for identifying tea picking time by use of inductively coupled plasma spectroscopy (ICP) |
-
2019
- 2019-05-22 CN CN201910428325.2A patent/CN110082374B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778553A (en) * | 2012-08-01 | 2012-11-14 | 北京师范大学 | Experimental device and method for measuring vertical distribution of beryllium-7 activity in soil profile |
| CN103048313A (en) * | 2013-01-12 | 2013-04-17 | 北京中防昊通科技中心 | Method for identifying tea picking time by use of inductively coupled plasma spectroscopy (ICP) |
Non-Patent Citations (2)
| Title |
|---|
| 戴科荐等: "《气溶胶７Ｂｅ活度浓度的测量方法及其应用》", 《原子能科学技术》 * |
| 王建等: "《地面测年技术——宇生同位素测年》", 《地球科学进展》 * |
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