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Method for rapidly determining content of COD in chlorine-containing wastewater

A rapid determination of waste water technology, applied in the direction of measuring devices, preparation of test samples, color/spectral characteristics measurement, etc., can solve the problems of inaccurate COD data and difficulty in shielding chloride ions in high-chlorine wastewater

Pending Publication Date: 2021-12-07
赵辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned existing rapid determination technology, the present invention provides a method for rapid detection of COD in industrial wastewater to solve the problems of inaccurate COD data in high-chloride wastewater and difficulty in shielding chloride ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for quickly measuring the COD of industrial high-chlorine wastewater comprises the following steps:

[0015] 1 Dissolve 12.2577g of potassium dichromate standard reagent and 4g of mercuric sulfate in water, add 100ml of sulfuric acid to obtain c (Gr2O7 2- ) =0.5mol / L potassium dichromate standard solution. Among them, mercury sulfate is a chloride ion masking agent.

[0016] 2 Dissolve 7g of titanium sulfate in 50ml of 10% dilute sulfuric acid, and then add 950ml of concentrated sulfuric acid to obtain a titanium sulfate-sulfuric acid catalyst solution.

[0017] 3 Take 2ml of standard solution with chloride ion content of 300mg / L and COD content of 100mg / L in a test tube, add 1ml of potassium dichromate standard solution, 5ml of titanium sulfate-sulfuric acid solution and shake well.

[0018] 4. Digest at 140°C for 15 minutes, cool at room temperature for 2 minutes, add 2ml of pure water, shake well, place in a water-cooled pool to cool to room temperature,...

Embodiment 2

[0020] A method for quickly measuring the COD of industrial high-chlorine wastewater comprises the following steps:

[0021] 1 Dissolve 12.2577g of potassium dichromate standard reagent and 4g of mercuric sulfate in water, add 100ml of sulfuric acid to obtain c (Gr2O7 2- ) =0.5mol / L potassium dichromate standard solution. Among them, mercury sulfate is a chloride ion masking agent.

[0022] 2 Dissolve 7g of titanium sulfate in 50ml of 10% dilute sulfuric acid, and then add 950ml of concentrated sulfuric acid to obtain a titanium sulfate-sulfuric acid catalyst solution.

[0023] 3 Take 2ml of standard solution with chloride ion content of 600mg / L and COD content of 100mg / L in a test tube, add 1ml of potassium dichromate standard solution, 5ml of titanium sulfate-sulfuric acid solution and shake well.

[0024] 4. Digest at 140°C for 15 minutes, cool at room temperature for 2 minutes, add 2ml of pure water, shake well, place in a water-cooled pool to cool to room temperature,...

Embodiment 3

[0026] A method for quickly measuring the COD of industrial high-chlorine wastewater comprises the following steps:

[0027] 1 Dissolve 12.2577g of potassium dichromate standard reagent and 4g of mercuric sulfate in water, add 100ml of sulfuric acid to obtain c (Gr2O7 2- ) =0.5mol / L potassium dichromate standard solution. Among them, mercury sulfate is a chloride ion masking agent.

[0028] 2 Dissolve 7g of titanium sulfate in 50ml of 10% dilute sulfuric acid, and then add 950ml of concentrated sulfuric acid to obtain a titanium sulfate-sulfuric acid catalyst solution.

[0029] 3 Take 2ml of standard solution with chloride ion content of 900mg / L and COD content of 100mg / L in a test tube, add 1ml of potassium dichromate standard solution, 5ml of titanium sulfate-sulfuric acid solution and shake well.

[0030] 4. Digest at 140°C for 15 minutes, cool at room temperature for 2 minutes, add 2ml of pure water, shake well, place in a water-cooled pool to cool to room temperature,...

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Abstract

The invention discloses a method for rapidly determining the content of COD in chlorine-containing wastewater, which is characterized in that mercury sulfate is used as a chloride ion masking agent, potassium dichromate is used as an oxidizing agent, titanium sulfate is used as a catalyst, and a titanium sulfate-sulfuric acid solution is used for replacing silver sulfate-concentrated sulfuric acid, so that the influence of chloride ions on COD detection is greatly reduced. The rapid digestion temperature is 140 DEG C, and high-temperature digestion is replaced by low-temperature digestion, so that the operation safety is improved, and the requirement on an instrument is reduced.

Description

technical field [0001] The invention belongs to the technical field of water quality monitoring, in particular to a detection method for quickly measuring COD content in waste water. Background technique [0002] COD is an important indicator of wastewater treatment quality. At present, the national standard method for determining COD in my country is potassium dichromate oxidation reflux method. This method has high oxidation rate, good reproducibility, and accurate and reliable data. The determination method is an arbitration method, but the national standard method takes a long time and consumes more reagents. Enterprises often use a rapid determination method to monitor COD in sewage. The usual rapid detection method uses potassium dichromate solution as the reducing agent, sulfuric acid- Silver sulfate was used as a catalyst, and the absorbance of the solution was measured under 600nm light wave. However, the chloride ion content has a very serious impact on the rapid de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/38G01N1/44G01N21/31G01N21/78G01N31/10
CPCG01N1/2853G01N1/38G01N1/44G01N1/28G01N21/31G01N21/78G01N31/10G01N2021/786
Inventor 赵辉王瑞
Owner 赵辉
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