CN1046604A - A kind of water hardness quickly measuring agent - Google Patents
A kind of water hardness quickly measuring agent Download PDFInfo
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- CN1046604A CN1046604A CN 89102540 CN89102540A CN1046604A CN 1046604 A CN1046604 A CN 1046604A CN 89102540 CN89102540 CN 89102540 CN 89102540 A CN89102540 A CN 89102540A CN 1046604 A CN1046604 A CN 1046604A
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- water hardness
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Abstract
The present invention relates to the special agent of quick determination for water hardness, be applicable to that the boiler feed water stove handles Na-ion exchanger outward and go out water correction and effectively supervise.Measure agent by complexing agent EDTA disodium salt, indicator, acid chromium blue k, KB indicator; Buffering agent; Lithium hydroxide-boric acid and neutral salt protective agent are formed, and can control the index of hardness as requested and adjust the monitoring that pharmaceutical formulation adapts to water hardness at different levels.Compare with traditional E DTA compleximetry, simplified control, fast, accurately, save assay device, measure sensitivity and reach ± 2 equivalent parts per billions.
Description
The present invention relates to water quality, the special agent of hardness quickly measuring.
As everyone knows, the water hardness of boiler feed water is directly connected to saving energy consumption and the safe life problem in the boiler operatiopn.So the used boiler of commercial production all is equipped with the technical equipment and the measure of feedwater water treatment.Or soften processing outside stove, or the softening medicament of adding is handled in stove in going into stove water.Handle with regard to the Na-ion exchanger commonly used with regard to stove is outer, the water hardness after the processing reduces, but the hardness that whether conforms with boiler feed water requires to be still and will judge by measuring.After ion exchange resin in the Na-ion exchanger bore a certain amount of water softening processing, treatment effeciency descended, even loses efficacy, and needed use after resin regeneration.The existing method in common of water hardness of measuring boiler feed water is the EDTA compleximetry, and the water quality standard of the milligramequivalent number contrast boiler feed water of calcic, magnesium ion determines whether water quality is qualified, whether can enter boiler in the water that calculates with titration results.In the continuous operational process of boiler, water treatment also is continuous operation, and for monitoring in time enters the feed-water quality of boiler, it is very frequent work that water hardness is measured.
The process that the present invention is intended to water hardness is measured is simplified, a kind of fast measuring agent is provided, plan adds a certain amount of fast measuring agent in a certain amount of detected water sample after, have obvious color to show in several seconds, and boundary 0.03 equivalent parts per million that requires with existing low-pressure boiler water quality standard GB1576-85 water hardness is the reference mark, is color transition point, judge that water hardness is qualified or defective rapidly.
This fast measuring preparation is according to the principle of the residual hard complexometry of soft water.Change the mode of titration.The change titration shows into the complexing variable color of limiting the quantity of, sxemiquantitative control.Promptly be controlled in the stable pH value scope, indicator can form colored complex with metallic ion, and free calcium, magnesium ion complexing forms the higher colourless complex compound of stability in complexing agent and the water.Because the latter is more stable than the former, the free calcium in the tested water, magnesium ion at first just can form colored complex with indicator with the complexing agent complexing when the surplus, make the test solution variable color.At this moment, according to the consumption of the hardness calculation complexing agent that will control, can reach the purpose of sxemiquantitative control by the complexing variable color.Thereby indispensable composition is in the mensuration agent: pH value is regulated buffering agent; Indicator; Complexing agent.At measurand is the low-pressure boiler feedwater of handling through Na-ion exchanger, requires its calcium, magnesium ion content≤0.03 equivalent parts per million, selectes this mensuration agent and forms.
PH value is regulated buffering agent: the preferable pH value scope of calcium, magnesium ion complexometry is 9.7≤PH≤10.5, and all buffering agents that is fit to this scope all can be selected for use.We have selected combination such as the sodium hydrogen phosphate and the sodium dihydrogen phosphate of polynary salt of weak acid for use, have also selected the combination of lithium hydroxide and boric acid for use, and when lithium hydroxide and boric acid amount ratio were 2: 1, the pH value of scalable solution was stabilized in 10 ± 0.1 the scope.
Indicator: 1. select acid chrome blue K for use, this indicator shows blue purple in above-mentioned pH value scope aqueous solution, and with calcium, magnesium ion complexing after show claret.2.KB indicator be by acid chrome blue K and naphthol green B with 1: the 2-2.5 ratio is mixed and is made a kind of mixed indicator with potassium nitrate as protective agent then.In above-mentioned pH value scope aqueous solution, show blue green, with apparent red after calcium, the magnesium ion complexing.
Complexing agent: the EDTA-Na(disodium ethylene diamine tetraacetate) its consumption calculates definite according to the quantity of calcium, magnesium ion in the control measured object.
Except that above-mentioned main composition, also with protective agent such as neutral salt such as sodium chloride or potassium nitrate etc. as indicator.To guarantee that this fast measuring agent can be sensitive in 1 year to the time limit of a year and a half, effective.Consider and measure the quick produce effects of agent energy in test process, its key is to measure agent fully dissolving fast in detected water sample, at first is the wherein quick abundant dissolving of indicator.So we select ammoniacal liquor for use when the agent of preparation fast measuring, or the mixed liquor of ammoniacal liquor and ammonium chloride fully mixes with other reagent more earlier with the indicator dissolving.
The fast measuring agent is preparation like this:
Embodiment one, pharmaceutical formulation
Reagent (analyzing pure) weight (%)
Anhydrous lithium hydroxide 1-2
Boric acid 0.5-1
Acid chrome blue K 0.125-0.375
EDTA disodium salt 0.125-0.14
Neutral salt (sodium chloride or potassium nitrate) 98.15-96.485
It is pure that agents useful for same is analysis, requires granularity to cross 100 mesh sieves.Preparation 10 gram fast measuring agent: take by weighing 12.5 milligrams of acid chrome blue Ks, be dissolved in 1 milliliter of ammoniacal liquor monochlor(in)ate ammonium salt solution for preparing (notes).Take by weighing 12.5 milligrams of EDTA-Na again, 100 milligrams of anhydrous lithium hydroxides, 50 milligrams of boric acid and 9815 milligrams of neutral salt mix the back and mix once more with dissolving acid chrome blue K solution well.The potpourri that this is moist places exsiccator dry, behind the bone dry, takes out porphyrize, mixes, and is standby in the brown Packaging Bottle of packing into.The fast measuring agent that makes is black purple pulverulent solids.The preparation of (notes) ammoniacal liquor-ammonium chloride solution: take by weighing 20 gram ammonium chlorides,, get 150 milliliters of ammoniacal liquor (proportion=0.9 again with moving in 1000 milliliters of volumetric flasks behind a small amount of dissolved in distilled water, concentration is 25-28%) in volumetric flask, adding distil water is diluted to scale, and mixing is standby.
Embodiment two, pharmaceutical formulation
Reagent (analyzing pure) weight %
Sodium dihydrogen phosphate 0.75-0.85
Sodium hydrogen phosphate 0.86-0.96
EDTA-Na
20.125-0.14
Neutral salt (sodium chloride or potassium nitrate) 98.0775-97.675
It is pure that agents useful for same is analysis; Require granularity to cross 100 mesh sieves (indicator exception).
Preparation 10 gram fast measuring agent: 12.5 milligrams of acid chrome blue Ks that will weigh up, 25 milligrams of naphthol green B Hun close Jun Yun And and are dissolved in 1 milliliter of ammoniacal liquor-ammonium chloride solution; Take by weighing 14 milligrams of EDTA-Na again
29767.5 milligram neutral salt, after 85 milligrams of sodium dihydrogen phosphates and 96 milligrams of sodium hydrogen phosphates fully mix, join in the lysed indicator solution, mix once more, the potpourri that this is moist places exsiccator dry, behind the bone dry, take out porphyrize, mix, standby in the brown Packaging Bottle of packing into.The fast measuring agent that makes is the dirty-green pulverulent solids.
The method of using above-mentioned fast measuring agent to measure water hardness is: measure the water outlet of low-pressure boiler Na-ion exchanger to scale with 25 milliliters of color comparison tubes, add 100 ± 10 milligrams of fast measuring agent (notes).Shake up, observe color.Test solution shows blue purple and represents that water hardness is qualified, is≤0.03 equivalent parts per million.If test solution displaing amaranth then represent that water hardness is defective, the dark more then hardness of redness is big more.Measurement sensitivity reaches ± 2 equivalent parts per billions.(notes), the method that " adding 100 ± 10 milligrams of fast measuring agent " can not adopt to take by weighing in operation.Selecting Xiao Shao And of system to calibrate one little spoonful of amount of reagent in advance by operating personnel is 100 ± 10 milligrams, just gets final product with one spoonful of reagent of little spoon amount during operation, and operation is more simplified.
The fast measuring agent sensitivity and the EDTA complexometry table of comparisons:
| Measure the date | Consume EDTA (0.005M) liquor capacity (milliliter) | The water hardness (equivalent parts per million) | Fast measuring agent consumption (milligram) | Colour developing | ||
| Blue purple | Purplish red | Red | ||||
| 86.8.30 86.10.27 86.12.19 87.1.12 87.1.14 87.1.19 | 0.29 0.32 0.33 0.29 0.29 0.32 | 0.029 0.032 0.033 0.029 0.029 0.032 | 100 100 100 100 100 100 | √ √ √ | √ √ √ | |
A kind of exploitation of novel agent is not only in realization of the present invention, also is the improvement of water quality and hardness measuring method simultaneously. Owing to simplified procedure of test, therefore can save macromethod instrument, chemical standard reagent and loaded down with trivial details operation sequence. Softening simple and fast, sensitive and accurate, the economically viable good method of providing of effectively supervising for boiler feedwater.
Claims (7)
1, a kind of water hardness quickly measuring agent is characterized in that by the pH value buffering agent, and indicator and complexing agent are that main composition is formed.
2, according to the described fast measuring agent of claim 1 master composition, it is characterized in that: the pH value buffering agent is salt or other agent combination of adjusting pH value in the 9.7-10.5 scope, as, anhydrous lithium hydroxide and boric acid, sodium hydrogen phosphate and sodium dihydrogen phosphate.
According to the described fast measuring agent of claim 1 master composition, it is characterized in that 3, indicator is to form color clear, tangible metal indicator of variable color such as acid chrome blue K, or KB indicator with calcium, magnesium ion complexing.
4, according to the described fast measuring agent of claim 1 master composition, it is characterized in that complexing agent is EDTA-Na
2, i.e. disodium ethylene diamine tetraacetate.
According to the described fast measuring agent of claim 1, it is characterized in that 5, with neutral salt sodium chloride, potassium nitrate is as the protective agent of indicator except that main composition.
6, it is characterized in that according to the described fast measuring agent of claim 1-5 its compositing formula is:
Reagent (analyzing pure) weight %
Anhydrous lithium hydroxide 1-2
Boric acid 0.5-1
Acid chrome blue K 0.125-0.375
EDTA-Na
20.125-0.14
Neutral salt (sodium chloride or potassium nitrate) adds to 100
7, the water hardness quickly measuring agent of preparing according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102540 CN1015743B (en) | 1989-04-16 | 1989-04-16 | Water hardness quickly measuring agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102540 CN1015743B (en) | 1989-04-16 | 1989-04-16 | Water hardness quickly measuring agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1046604A true CN1046604A (en) | 1990-10-31 |
| CN1015743B CN1015743B (en) | 1992-03-04 |
Family
ID=4854777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102540 Expired CN1015743B (en) | 1989-04-16 | 1989-04-16 | Water hardness quickly measuring agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015743B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397075C (en) * | 1999-11-25 | 2008-06-25 | 三浦工业株式会社 | Hardness indicator composition for water hardness measurement and hardness measuring method |
| CN102253165A (en) * | 2011-04-18 | 2011-11-23 | 宁夏大学 | Total water hardness test indicator and preparation method thereof |
| CN102539329A (en) * | 2011-11-24 | 2012-07-04 | 沈阳理工大学 | Method for measuring total hardness of industrial water |
| CN105190289A (en) * | 2013-03-14 | 2015-12-23 | 艺康美国股份有限公司 | Water hardness monitoring via fluorescence |
| CN105388149A (en) * | 2015-10-27 | 2016-03-09 | 广东环凯微生物科技有限公司 | Reagent and method for fast detecting water quality total hardness |
| CN107907536A (en) * | 2017-12-15 | 2018-04-13 | 大工（青岛）新能源材料技术研究院有限公司 | A kind of improved method of EDTA titration measurings calcium content |
| CN108241037A (en) * | 2016-12-23 | 2018-07-03 | 北京有色金属研究总院 | The rapid analysis method of molybdenum in a kind of molybdenum concntrate |
| CN114441524A (en) * | 2022-02-14 | 2022-05-06 | 上海蓝长自动化科技有限公司 | Water hardness determination reagent combined with continuous flow analyzer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037430C (en) * | 1993-03-29 | 1998-02-18 | 田永豪 | Multielement compound fertilizer and its producing method |
-
1989
- 1989-04-16 CN CN 89102540 patent/CN1015743B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397075C (en) * | 1999-11-25 | 2008-06-25 | 三浦工业株式会社 | Hardness indicator composition for water hardness measurement and hardness measuring method |
| CN102253165A (en) * | 2011-04-18 | 2011-11-23 | 宁夏大学 | Total water hardness test indicator and preparation method thereof |
| CN102253165B (en) * | 2011-04-18 | 2014-04-16 | 宁夏大学 | Preparation method of total water hardness test indicator |
| CN102539329A (en) * | 2011-11-24 | 2012-07-04 | 沈阳理工大学 | Method for measuring total hardness of industrial water |
| CN105190289A (en) * | 2013-03-14 | 2015-12-23 | 艺康美国股份有限公司 | Water hardness monitoring via fluorescence |
| CN105190289B (en) * | 2013-03-14 | 2018-02-16 | 艺康美国股份有限公司 | Pass through the fluorescence monitoring water hardness |
| CN105388149A (en) * | 2015-10-27 | 2016-03-09 | 广东环凯微生物科技有限公司 | Reagent and method for fast detecting water quality total hardness |
| CN108241037A (en) * | 2016-12-23 | 2018-07-03 | 北京有色金属研究总院 | The rapid analysis method of molybdenum in a kind of molybdenum concntrate |
| CN107907536A (en) * | 2017-12-15 | 2018-04-13 | 大工（青岛）新能源材料技术研究院有限公司 | A kind of improved method of EDTA titration measurings calcium content |
| CN114441524A (en) * | 2022-02-14 | 2022-05-06 | 上海蓝长自动化科技有限公司 | Water hardness determination reagent combined with continuous flow analyzer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1015743B (en) | 1992-03-04 |
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