CN1015743B - Water hardness quickly measuring agent - Google Patents
Water hardness quickly measuring agentInfo
- Publication number
- CN1015743B CN1015743B CN 89102540 CN89102540A CN1015743B CN 1015743 B CN1015743 B CN 1015743B CN 89102540 CN89102540 CN 89102540 CN 89102540 A CN89102540 A CN 89102540A CN 1015743 B CN1015743 B CN 1015743B
- Authority
- CN
- China
- Prior art keywords
- agent
- indicator
- water hardness
- water
- hardness
- 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.)
- Expired
Links
Abstract
The present invention relates to a special reagent for rapidly detecting water hardness, which is suitable for the effective monitoring of effluent water softening from a sodium ion exchanger through the external treatment of boiler feedwater. A detection agent comprises EDTA disodium salt as a complex agent, an indicator, acid chrome blue K, a KB indicator, a buffering agent, lithium hydroxide-boracic acid and a neutral salt protecting agent. The hardness index can be controlled according to the requirement, and a preparation formula is regulated so as to adapt to the monitoring of different level water hardness. Compared with a traditional EDTA complexometric titration method, the method using the special reagent has the advantages that the operation is simplified and is rapid and accurate, the assay equipment is omitted, and the detecting sensitivity reaches +/-2 mu e/L.
Description
The present invention relates to the special agent of quick determination for water hardness.
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 lost efficacy, need after resin regeneration, to use.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.Be color transition point, judge that rapidly water hardness is qualified or defective.
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 p H 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 complex compound and the water.Because the latter is more stable than the former, sharp in the tested water at first just can form colored complex with indicator with the complexing agent complexing during as surplus from calcium, magnesium ion.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: the 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.
The 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.When lithium hydroxide and boric acid amount ratio were 2: 1, the pH value stabilization of scalable solution was in 10 ± 0.1 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 then and is made a kind of mixed indicator with potassium nitrate as protective agent.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 and sodium chloride or potassium nitrate etc. as indicator, with guarantee this fast measuring agent can be sensitive in 1 year to the time limit of a year and a half, effectively.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 amine-oxides 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-ammonium chloride 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.Mix, 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, with moving in 1000 milliliters of volumetric flasks behind a small amount of dissolved in distilled water.In volumetric flask, adding distil water is diluted to scale to get 150 milliliters of ammoniacal liquor (proportion=0.9, concentration are 25-28%) again, 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
Acid chrome blue K 0.0625-0.125
The KB indicator
Naphthol green B 0.125-0.25
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 Bs mix and are dissolved in 1 milliliter of ammoniacal liquor-ammonium chloride solution; Take by weighing 14 milligrams of EDTA-Na again
2, 9767.5 milligrams of 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, takes out porphyrize, mixes, and is 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, promptly≤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.Being selected little spoon of system in advance and calibrated one little spoonful of amount of reagent 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.(seeing below table)
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 running program.Softening simple and easy quick, sensitive and accurate, the economically viable good method that provides of effectively supervising for boiler feed water.
The fast measuring agent sensitivity and the EDTA complexometry table of comparisons:
Measure date consumption EDTA(0.005M) quick measurement of water hardness agent colour developing
Liquor capacity (milliliter) (equivalent parts per million) consumption (milligram) is blue purple purplish red red
86.8.30 0.29 0.029 100 √
86.10.27 0.32 0.032 100 √
86.12.19 0.33 0.033 100 √
87.1.12 0.29 0.029 100 √
87.1.14 0.29 0.029 100 √
87.1.19 0.32 0.032 100 √
Claims (1)
1, a kind of water hardness is measured agent, comprise pH value buffering agent, indicator protective agent and complexing agent is characterized in that described pH value buffering agent is anhydrous lithium hydroxide and boric acid, indicator is an acid chrome blue K, and the indicator protective agent is that neutral salt (sodium chloride or potassium nitrate) complexing agent is the EDTA sodium salt; Its compositing formula is as follows:
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
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 CN1046604A (en) | 1990-10-31 |
| CN1015743B true 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 (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 |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4168557B2 (en) * | 1999-11-25 | 2008-10-22 | 三浦工業株式会社 | Hardness measuring indicator and hardness measuring method |
| 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 |
| US8956875B2 (en) * | 2013-03-14 | 2015-02-17 | Ecolab USA, Inc. | 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 |
| 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 |
-
1989
- 1989-04-16 CN CN 89102540 patent/CN1015743B/en not_active Expired
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1046604A (en) | 1990-10-31 |
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