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Method for rapidly detecting COD (Chemical Oxygen Demand) in industrial wastewater

An industrial wastewater, rapid technology, applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problems of long time and high cost, and achieve the effects of improving detection accuracy, accelerating decomposition, and shortening digestion time.

Pending Publication Date: 2020-01-10
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned prior art, the present invention provides a method for rapidly detecting COD in industrial wastewater to solve the problems of high cost and long time-consuming of existing detection methods

Method used

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  • Method for rapidly detecting COD (Chemical Oxygen Demand) in industrial wastewater

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Experimental program
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Effect test

Embodiment 1

[0036] A method for rapidly detecting COD in industrial wastewater, comprising the following steps:

[0037] S1: Mix concentrated phosphoric acid and concentrated sulfuric acid at a volume ratio of 1:6 to obtain a mixed acid; mix manganese dihydrogen phosphate and potassium hydrogen sulfate at a mass ratio of 5:1 to obtain a catalyst; mix the catalyst at a solid-liquid ratio of 1g / 50mL Dissolve in mixed acid to obtain catalytic solution; mix silver nitrate and bismuth nitrate at a mass ratio of 1:4 to obtain chloride ion masking agent;

[0038] S2: Add 0.1g of chloride ion masking agent into the COD digester, then add 5mL of environmental standard sample, mix well and then add 10mL of K with a concentration of 0.15mol / L 2 Cr 2 o 7 solution and 15mL of catalytic solution; then digest the mixture in a COD digester at 150°C for 10min; after cooling, rinse the wall of the condenser with 70mL of distilled water;

[0039] S3: Add 2 to 3 drops of ferrous iron indicator to the dige...

Embodiment 2

[0041] A method for rapidly detecting COD in industrial wastewater, comprising the following steps:

[0042] S1: Mix concentrated phosphoric acid and concentrated sulfuric acid at a volume ratio of 1:5 to obtain a mixed acid; mix manganese dihydrogen phosphate and potassium hydrogen sulfate at a mass ratio of 4:1 to obtain a catalyst; mix the catalyst at a solid-liquid ratio of 1g / 45mL Dissolve in mixed acid to obtain catalytic solution; mix silver nitrate and bismuth nitrate at a mass ratio of 1:5 to obtain chloride ion masking agent;

[0043] S2: Add 0.1g of chloride ion masking agent into the COD digester, then add 5mL of environmental standard sample, mix well and then add 15mL of K with a concentration of 0.15mol / L 2 Cr 2 o 7 solution and 15mL catalytic solution; then digest the mixture in a COD digester at 150°C for 5min; after cooling, wash the condenser wall with 70mL distilled water;

[0044] S3: Add 2 to 3 drops of ferrous iron indicator to the digested solution, ...

Embodiment 3

[0046] A method for rapidly detecting COD in industrial wastewater, comprising the following steps:

[0047] S1: Mix concentrated phosphoric acid and concentrated sulfuric acid at a volume ratio of 1:7 to obtain a mixed acid; mix manganese dihydrogen phosphate and potassium hydrogen sulfate at a mass ratio of 6:1 to obtain a catalyst; mix the catalyst at a solid-liquid ratio of 1g / 55mL Dissolve in mixed acid to obtain catalytic solution; mix silver nitrate and bismuth nitrate at a mass ratio of 1:4 to obtain chloride ion masking agent;

[0048] S2: Add 0.1g of chloride ion masking agent into the COD digester, then add 5mL of environmental standard sample, mix well and then add 10mL of K with a concentration of 0.15mol / L 2 Cr 2 o 7 solution and 15mL of catalytic solution; then digest the mixture in a COD digester at 170°C for 5min; after cooling, rinse the condenser wall with 70mL of distilled water;

[0049] S3: Add 2 to 3 drops of ferrous iron indicator to the digested sol...

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Abstract

The invention discloses a method for rapidly detecting COD (Chemical Oxygen Demand) in industrial wastewater. According to the method, silver nitrate and bismuth nitrate are adopted as chloride ion masking agents, so that chloride ions in a detected sample can be effectively masked, and detection precision is greatly improved; manganese dihydrogen phosphate and potassium hydrogen sulfate are usedas catalysts, so that the oxidation of organic matters in the wastewater by potassium dichromate can be accelerated, and therefore, detection time is shortened, and detection efficiency is improved. With the method provided by the invention adopted, the use of silver sulfate and mercury sulfate is avoided; detection cost can be reduced; no secondary pollution is caused to the environment; detection time can be shortened; and the green and clean determination of the COD is realized.

Description

technical field [0001] The invention belongs to the technical field of water quality monitoring, in particular to a method for quickly detecting COD in industrial wastewater. Background technique [0002] Industrial wastewater contains a variety of organic compounds. The concentration of organic compounds is determined in terms of chemical oxygen demand (COD), which is measured indirectly using the amount of oxygen required to oxidize organic pollutants in wastewater. It is an important parameter to determine the degree of water pollution. The chromium titration method based on dichromate (HJ828-2017, replacing GB11914-1989) is used as a standard method for water quality and water quality testing. Chromium titration method (HJ 828-2017) is the main method of COD monitoring in my country, also known as COD Cr method, which is equivalent to ISO 6060 "Determination of Chemical Oxygen Demand in Water Quality". This method has high oxidation rate, good reproducibility and accur...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/44
CPCG01N1/44G01N31/16
Inventor 白鸽王琛仲红艳
Owner QILU UNIV OF TECH
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