Method and reagent composition for measuring chemical oxygen consumption in water

A chemical oxygen consumption and composition technology, applied in the field of water analysis, can solve the problems of large relative standard deviation of measurement results, poor measurement accuracy and stability, long time required, etc. Stability-enhancing effect

Inactive Publication Date: 2017-04-26
侯文婷
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  • Abstract
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Problems solved by technology

[0008] At present, with the increasingly serious pollution and the increasing emphasis on environmental protection, the requirements for the detection of chemical oxygen consumption are also increasing. Reagents are used to detect chemical oxygen demand on water quality analysis instruments. The dosage needs to be at least roughly equivalent to the sum of the injection volume of the water sample to be tested plus other main reagents. On this premise, it is difficult to further reduce the injection volume of the water sample to be tested and potassium dichromate. The injection volume of sulfuric acid is also difficult to further reduce, so the amount of concentrated sulfuric acid discharged during the chemical oxygen demand detection process is very considerable, which can bring very serious secondary pollution to the environment; (2) time efficiency is too low: Also affected by the fact that the injection volume is difficult to further reduce, the time required for the chemical oxygen demand detection process is usually longer, and the time efficiency is a very important parameter for both industrial production and water quality monitoring. The time efficiency often means the loss of thousands or even hundreds of thousands of yuan; (3) usually compared with manual analysis, the injection volume of water samples is less, and the accuracy and stability of water quality analysis instruments are poor: the existing The relative standard deviation of the measurement results is large, and as the injection volume decreases, the accuracy and stability of the measurement are getting worse

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  • Method and reagent composition for measuring chemical oxygen consumption in water
  • Method and reagent composition for measuring chemical oxygen consumption in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] test group:

[0084] (1) Preparation of reagents

[0085] Reagent I: Prepare three groups of reagent I consisting of potassium dichromate, concentrated sulfuric acid and silver sulfate, which are respectively denoted as reagent I a ~I c , specifically, reagent I a The concentration of potassium dichromate in medium is 0.54g / L, and the concentration of silver sulfate is 5.12g / L; Reagent I b The concentration of potassium dichromate in medium is 3.63g / L, and the concentration of silver sulfate is 11.04g / L; Reagent I c The concentration of potassium dichromate in the medium is 5.98g / L, and the concentration of silver sulfate is 15.96g / L.

[0086] (2) Detection of chemical oxygen consumption

[0087] The 30mg / L standard concentration chemical oxygen demand water sample is tested, and three water quality analyzers (all of which are JZ-CG01 online automatic monitors for chemical oxygen demand of Wuhan Juzheng Environmental Protection Technology Co., Ltd.) are used to per...

Embodiment 2

[0105] test group:

[0106] (1) reagent 1 uses the reagent 1 prepared by the experimental group of embodiment 1 a ~ I c .

[0107] (2) Detection of chemical oxygen consumption

[0108] The 30mg / L standard concentration chemical oxygen demand water sample was tested, and three water quality analyzers (both CQ-X / C online chemical oxygen demand monitors of Jiangxi Xiashi Chunqiu Environmental Investment Co., Ltd.) were taken, respectively. Do the same as follows:

[0109] 1) Take 1mL of 30mg / L standard concentration chemical oxygen demand water sample and 1mL of reagent I respectively a Mix in the digestion device;

[0110] 2) the resulting mixture is digested;

[0111] 3) Determination of the remaining hexavalent chromium ion concentration or the produced trivalent chromium ion concentration in the digestion product obtained in step 2), and then calculate the chemical oxygen demand in the water body, which is the 30mg / L standard concentration chemical oxygen demand water sam...

Embodiment 3

[0127] test group:

[0128] (1) Preparation of reagents

[0129] Reagent i: prepare three groups of reagent i consisting of potassium dichromate and concentrated sulfuric acid, which are respectively denoted as reagent i a ~i c , specifically, reagent i a The concentration of potassium dichromate in medium is 0.32g / L, reagent i b The concentration of potassium dichromate in medium is 3.08g / L, reagent i c The concentration of potassium dichromate in the medium is 13.32g / L.

[0130] Reagent ii: Prepare three sets of silver sulfate aqueous solutions and record them as ii a 、ii b and ii c , the concentration of silver sulfate is 6.38g / L, the concentration of silver sulfate is 14.95g / L, and the concentration of silver sulfate is 18.65g / L.

[0131] (2) Detection of chemical oxygen consumption

[0132] The 30mg / L standard concentration chemical oxygen demand water sample is tested, and three water quality analyzers (all of which are COD from Hebei Huahou Tiancheng Environmen...

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Abstract

The invention relates to the technical field of water analysis, in particular to a method and reagent composition for measuring chemical oxygen consumption in water. The method for measuring the chemical oxygen consumption in the water comprises the steps that 1, a water sample to be measured and a reagent I are mixed, the reagent I contains potassium dichromate, concentrated sulfuric acid and a catalyst, the concentration of potassium dichromate ranges from 0.062 g / L to 13.7 g / L, and the sample introduction volume of the reagent I is smaller than or equal to 5 mL; 2, the obtained mixture is decomposed at the temperature higher than 90 DEG C; 3, the chemical oxygen consumption in the water is obtained through calculation. According to the method and the reagent composition, the precision and accuracy of the chemical oxygen consumption detecting result can be effectively improved, meanwhile, the sample introduction volume, especially the sample introduction volume of concentrated sulfuric acid can be effectively reduced, and a water sample with high chemical oxygen consumption concentration can be detected. The method and the reagent composition can be especially suitable for a micro sample introduction mode, and the smaller the sample introduction volume is, the more obvious the advantages of the method and the reagent composition are.

Description

technical field [0001] The invention relates to the technical field of water analysis, in particular to a method for measuring chemical oxygen consumption in water and a reagent composition used in the method. Background technique [0002] Chemical oxygen demand refers to the amount of oxidant consumed by the oxidation of reducing substances in water by oxidants, expressed in mg / L of oxygen consumption per unit volume of water. Chemical oxygen demand, also known as chemical oxygen demand, reflects The pollution degree of reducing substances in water is a routine monitoring item in water quality testing and an important indicator for evaluating water pollution. At present, the most commonly used method for measuring chemical oxygen demand is the dichromate method. The principle of this method is used to define chemical oxygen demand as: under certain conditions, the solubility in water samples is oxidized by potassium dichromate. The mass concentration of oxygen correspondin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N1/28G01N1/44
CPCG01N33/1806G01N1/28G01N1/44
Inventor 孙诗文
Owner 侯文婷
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