CN101750414A - Method for measuring chemical oxygen demand of waste water - Google Patents
Method for measuring chemical oxygen demand of waste water Download PDFInfo
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- CN101750414A CN101750414A CN200810184896A CN200810184896A CN101750414A CN 101750414 A CN101750414 A CN 101750414A CN 200810184896 A CN200810184896 A CN 200810184896A CN 200810184896 A CN200810184896 A CN 200810184896A CN 101750414 A CN101750414 A CN 101750414A
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Abstract
The invention discloses a method for measuring the chemical oxygen demand of waste water, which comprises the following steps: preparing standard solution of potassium dichromate, ferroin indicator solution, standard solution of ammonium ferrous sulfate, solution of sulfuric acid-silver sulfate and mercuric sulfate; diluting the mercuric sulfate in a water sample, adding the standard solution of potassium dichromate and a plurality of cleaned glass balls in a certain proportion; adding the solution of sulfuric acid-silver sulfate; heating the solution into an autoclave; after keeping the solution at a certain temperature and under a certain pressure for a period of time, adding water to continuously cool to room temperature; adding the ferroin indicator solution, performing titration through the standard solution of ammonium ferrous sulfate; recording the dosage of the standard solution of ammonium ferrous sulfate according to color changes; performing a blank experiment through distilled water according to the same operating steps; and recording the dosage of the standard solution of ammonium ferrous sulfate in blank titration. The method has the advantages of time conservation, and simple requirements on test conditions.
Description
Technical field
The present invention relates to a kind of method of measuring the waste water index, relate in particular to a kind of method of measuring chemical oxygen demand of waste water.
Background technology
At present, the chemical oxygen demand (COD) of waste water (COD) adopts potassium dichromate method to measure usually.This method accuracy and precision are all higher, but consuming time longer.In actual production, particularly during engineering debug, need in time to understand the data of each treatment process index sometimes, so that in time understand and control the chemical oxygen demand figureofmerit of waste water in production, the engineering debug process.Therefore, the method for researching and developing a kind of fast measuring chemical oxygen demand of waste water seems very necessary.
Summary of the invention
The objective of the invention is for but a kind of method of fast measuring chemical oxygen demand of waste water is provided.
For achieving the above object, technical scheme of the present invention is:
1, titration experiments: making concentration earlier is the potassium dichromate standard solution of 0.2500mol/L, and preparing ferroin indicator solution, iron ammonium sulfate titer, concentration again is sulfuric acid-silver sulfate solution, the mercuric sulfate of 10g/L.Earlier mercuric sulfate being diluted to concentration in water sample is 20g/L, with the mercuric sulfate liquor capacity is benchmark, add potassium dichromate titer and several washed glass balls with 2: 1 ratios, add sulfuric acid-silver sulfate with 2: 3 ratios, the above-mentioned solution for preparing is put into high-pressure sterilizing pot to be heated, pressure control is at 0.13～0.15MPa, and temperature is 123～126 ℃, reaches to finish behind the maintenance 40min behind upward pressure, the temperature conditions.After the cooling, add water and continue to be cooled to room temperature, add 3 ferroin indicator solutions, be terminal point by colour changing through blueness to bronzing, the consumption of solution in the record iron ammonium sulfate mark with iron ammonium sulfate standard solution titration to the color of solution.
When measuring water sample,, make blank assay by same operation steps with 1: 1 ratio replacement distilled water.The consumption of iron ammonium sulfate standard solution when the record titration is blank.
2, calculate
COD
Cr＝C(V
0-V
1)×8×1000/V
In the formula: C---the concentration of iron ammonium sulfate standard solution, mol/L
V
0---the volume of iron ammonium sulfate standard solution when titration is blank, mL
V
1---the volume of iron ammonium sulfate standard solution during the titration water sample, mL
The volume of V---water sample, mL
8---oxygen molal weight, g/mol
COD
Cr---chemical oxygen demand (COD), mg/L
Advantage of the present invention is: test process takes few, saves time, and the controlling index of debugging production requirement can in time be provided.This method does not reflux simultaneously, saves test water, is adapted at carrying out under the simple and easy condition.
Embodiment
Describe the present invention down in detail below in conjunction with specific embodiment.
Embodiment 1:
1, reagent preparation: earlier that the pure potassium dichromate 12.25g of top grade is soluble in water, move in the 1000mL volumetric flask, make the potassium bichromate solution of 0.2500mol/L; Take by weighing the 1.458g phenanthroline and the 0.695g ferrous sulphate is water-soluble, be diluted to 100mL, make the ferroin indicator solution and be stored in the brown bottle; It is soluble in water to take by weighing the 39.5g iron ammonium sulfate, adds the 20mL concentrated sulphuric acid, and the cooling back moves in the 1000mL volumetric flask, and thin up shakes up and makes the iron ammonium sulfate titer to graticule; In the 2500mL concentrated sulphuric acid, add the 25g silver sulfate, make sulfuric acid-silver sulfate solution.
2, titration test: add the 0.4g mercuric sulfate earlier in the 250ml conical flask, add the 20mL water sample again, accurately add 10.00mL potassium dichromate titer and several washed glass balls, measuring 30mL sulfuric acid-silver sulfate slowly adds in the conical flask, put into the high-pressure sterilizing pot heating after mixing, pressure control is at 0.13～0.15MPa, and temperature is 123～126 ℃, reaches to finish behind the maintenance 40min behind upward pressure, the temperature conditions.After the cooling, add water and continue to be cooled to room temperature, add 3 ferroin indicator solutions, be terminal point by colour changing through blueness to bronzing, the consumption of solution in the record iron ammonium sulfate mark with iron ammonium sulfate standard solution titration to the color of solution.
When measuring water sample,, make blank assay by same operation steps with 1: 1 ratio replacement distilled water.The consumption of iron ammonium sulfate standard solution when the record titration is blank.
3, chemistry oxygen demand.
Claims (3)
1. but the method for a fast measuring chemical oxygen demand of waste water, it is characterized in that: making concentration earlier is the potassium dichromate standard solution of 0.2500mol/L, and preparing ferroin indicator solution, iron ammonium sulfate titer, concentration again is sulfuric acid-silver sulfate solution, the mercuric sulfate of 10g/L.Earlier mercuric sulfate being diluted to concentration in water sample is 20g/L, with the mercuric sulfate liquor capacity is benchmark, add potassium dichromate titer and several washed glass balls with 2: 1 ratios, add sulfuric acid-silver sulfate with 2: 3 ratios, the above-mentioned solution for preparing is put into high-pressure sterilizing pot to be heated, pressure control is at 0.13～0.15MPa, and temperature is 123～126 ℃, reaches to finish behind the maintenance 40min behind upward pressure, the temperature conditions.After the cooling, add water and continue to be cooled to room temperature, add 3 ferroin indicator solutions, be terminal point by colour changing through blueness to bronzing, the consumption of solution in the record iron ammonium sulfate mark with iron ammonium sulfate standard solution titration to the color of solution.When measuring water sample,, make blank assay by same operation steps with 1: 1 ratio replacement distilled water.The consumption of iron ammonium sulfate standard solution when the record titration is blank.
2. the ferroin indicator solution described in the claim 1, phenanthroline and ferrous sulphate by 2: 1 mass ratioes mix, and make after the dilution.
3. the iron ammonium sulfate titer described in the claim 1, concentration is 0.1mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810184896A CN101750414A (en) | 2008-12-09 | 2008-12-09 | Method for measuring chemical oxygen demand of waste water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810184896A CN101750414A (en) | 2008-12-09 | 2008-12-09 | Method for measuring chemical oxygen demand of waste water |
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| CN101750414A true CN101750414A (en) | 2010-06-23 |
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| CN200810184896A Pending CN101750414A (en) | 2008-12-09 | 2008-12-09 | Method for measuring chemical oxygen demand of waste water |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507570A (en) * | 2011-10-28 | 2012-06-20 | 攀枝花鼎星钛业有限公司 | Method for determining chemical oxygen demand (COD) of titanium dioxide production waste water |
| CN104374868A (en) * | 2014-11-27 | 2015-02-25 | 中国石油天然气股份有限公司 | Detection method of movable microsphere gel content in produced fluid and application thereof |
| CN104792775A (en) * | 2015-01-16 | 2015-07-22 | 深圳市环境科学研究院 | An economical and rapid type test pack for colorimetric determination of COD in a water body and a determination method |
| CN105223200A (en) * | 2014-07-02 | 2016-01-06 | 西安航空动力股份有限公司 | A kind of method of content of hydrochloric acid in Accurate Determining iron chloride etchant solution |
| CN105445413A (en) * | 2015-12-04 | 2016-03-30 | 江阴秋毫检测有限公司 | Determination method for chemical oxygen demand in water and wastewater |
| CN106596838A (en) * | 2016-11-23 | 2017-04-26 | 深圳市朗石科学仪器有限公司 | COD measuring method |
| CN108956853A (en) * | 2018-07-16 | 2018-12-07 | 郑州市通标环境检测有限公司 | A kind of method that dichromate titration measures COD in water |
| CN109521143A (en) * | 2018-11-23 | 2019-03-26 | 绍兴市中测检测技术股份有限公司 | Organic wastewater COD online test method |
| CN110554031A (en) * | 2018-06-04 | 2019-12-10 | 财团法人交大思源基金会 | Colorimetric card, test set and method for judging chemical oxygen demand in water and wastewater |
| CN112881591A (en) * | 2021-01-15 | 2021-06-01 | 南京杰思尔环保智能科技有限公司 | Water sample COD concentration nonlinear decoupling control method based on differential geometric feedback control |
| CN114904586A (en) * | 2022-05-09 | 2022-08-16 | 洛阳莱博图电子科技有限公司 | COD prefabricated reagent for water quality sample determination and preparation method thereof |
-
2008
- 2008-12-09 CN CN200810184896A patent/CN101750414A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507570A (en) * | 2011-10-28 | 2012-06-20 | 攀枝花鼎星钛业有限公司 | Method for determining chemical oxygen demand (COD) of titanium dioxide production waste water |
| CN105223200B (en) * | 2014-07-02 | 2018-04-10 | 西安航空动力股份有限公司 | A kind of method of content of hydrochloric acid in Accurate Determining iron chloride etchant solution |
| CN105223200A (en) * | 2014-07-02 | 2016-01-06 | 西安航空动力股份有限公司 | A kind of method of content of hydrochloric acid in Accurate Determining iron chloride etchant solution |
| CN104374868A (en) * | 2014-11-27 | 2015-02-25 | 中国石油天然气股份有限公司 | Detection method of movable microsphere gel content in produced fluid and application thereof |
| CN104374868B (en) * | 2014-11-27 | 2016-04-06 | 中国石油天然气股份有限公司 | A kind of Produced Liquid microballoon shake gels detection method of content and application thereof |
| CN104792775A (en) * | 2015-01-16 | 2015-07-22 | 深圳市环境科学研究院 | An economical and rapid type test pack for colorimetric determination of COD in a water body and a determination method |
| CN105445413A (en) * | 2015-12-04 | 2016-03-30 | 江阴秋毫检测有限公司 | Determination method for chemical oxygen demand in water and wastewater |
| CN106596838A (en) * | 2016-11-23 | 2017-04-26 | 深圳市朗石科学仪器有限公司 | COD measuring method |
| CN110554031A (en) * | 2018-06-04 | 2019-12-10 | 财团法人交大思源基金会 | Colorimetric card, test set and method for judging chemical oxygen demand in water and wastewater |
| US11474091B2 (en) | 2018-06-04 | 2022-10-18 | National Yang Ming Chiao Tung University | Color chart, test kit, and method of estimating chemical oxygen demand of water |
| US11808749B2 (en) | 2018-06-04 | 2023-11-07 | National Yang Ming Chiao Tung University | Method of estimating chemical oxygen demand of water |
| CN108956853A (en) * | 2018-07-16 | 2018-12-07 | 郑州市通标环境检测有限公司 | A kind of method that dichromate titration measures COD in water |
| CN109521143A (en) * | 2018-11-23 | 2019-03-26 | 绍兴市中测检测技术股份有限公司 | Organic wastewater COD online test method |
| CN112881591A (en) * | 2021-01-15 | 2021-06-01 | 南京杰思尔环保智能科技有限公司 | Water sample COD concentration nonlinear decoupling control method based on differential geometric feedback control |
| CN114904586A (en) * | 2022-05-09 | 2022-08-16 | 洛阳莱博图电子科技有限公司 | COD prefabricated reagent for water quality sample determination and preparation method thereof |
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Open date: 20100623 |