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Digestion solution for monitoring chemical oxygen demand in sewage

A chemical oxygen demand and digestion solution technology, which is used in material analysis by observing the effect on chemical indicators, preparation of samples for testing, and analysis by chemical reaction of materials, etc. Expensive price, environmental pollution and other problems, to achieve the effect of wide application, safe and environmentally friendly use cost, and reduce use cost

Active Publication Date: 2009-06-03
TIANJIN CAPITAL ENVIRONMENTAL PROTECTION GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mercury sulfate is a highly toxic drug. Mercury poisoning will occur if it is used for a long time without proper protection. In addition, it will also cause environmental pollution in the discharge of waste liquid.
At present, large-scale sewage treatment plants currently use closed digestion colorimetry to monitor CODcr in sewage, and the digestion solution used with the instrument not only contains mercury salts but also is expensive
In the process of measuring CODcr by the closed digestion colorimetric method, the composition of the digestion solution has always been the focus of the testers. At present, foreign large-scale laboratory equipment suppliers such as Hach and Quark also provide matching CODcr digestion solutions while launching CODcr digestion instruments. But the price is expensive, and the grassroots laboratories cannot accept it at all

Method used

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  • Digestion solution for monitoring chemical oxygen demand in sewage
  • Digestion solution for monitoring chemical oxygen demand in sewage
  • Digestion solution for monitoring chemical oxygen demand in sewage

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A digestion solution for monitoring chemical oxygen demand in sewage, low-concentration digestion solution formula with CODcr value between 0 and 150 mg / l: active ingredients by volume ratio

[0020] 0.05mol / L potassium dichromate solution 1L

[0021] Concentrated sulfuric acid with a concentration of 98% 3L,

[0022] Potassium chromate 0.1—0.2g / 1L potassium dichromate solution

[0023] Silver sulfate 10g / L concentrated sulfuric acid.

[0024] Take 1L of potassium dichromate solution with a concentration of 0.05mol / l, and add 0.1g-0.2g of potassium chromate to the solution at the same time; dissolve 10g of silver sulfate in 1000ml of concentrated sulfuric acid with a concentration of 98%. The above two solutions are mixed according to the volume ratio of 1:3, and the standard water sample with a CODcr concentration of 0-150mg / l and a chloride content below 800mg / l can be monitored.

Embodiment 2

[0026] A digestion solution for monitoring chemical oxygen demand in sewage, a high-concentration digestion solution formula with a CODcr value between 0 and 1500 mg / l: active ingredients by volume ratio

[0027] 1.0mol / L potassium dichromate solution 1L

[0028] Concentrated sulfuric acid with a concentration of 98% 3L,

[0029] Potassium chromate 0.3g / 1L Potassium dichromate solution

[0030] Silver sulfate 20g / L concentrated sulfuric acid.

[0031] Prepare a potassium dichromate solution with a concentration of 1.0mol / l, and add 0.3g of potassium chromate to the solution at the same time; dissolve 20g of silver sulfate in 1000ml of concentrated sulfuric acid with a concentration of 98%; mix the above two solutions according to the volume ratio Mixed at 1:3, it can monitor the standard water sample whose CODcr concentration is between 0 and 1500mg / l and the chloride is below 800mg / l.

[0032] The digestion solution is mainly a mixed oxidant, which is the reducing substanc...

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Abstract

The invention relates to a digestion solution for monitoring chemical oxygen demand in sewage, which is characterized in that active ingredients comprise 1L of potassium dichromate solution, 3L of 98% concentrated sulfuric acid, 0.1-0.3g of potassium chromate and 30-60g of silver sulfate, wherein, the concentration of the potassium dichromate solution is 0.05-0.07mol / l or 1.0-1.2mol / l. The invention has the beneficial effects that halogen-free digestion solution is used to determine the chemical oxygen demand in sewage, and the silver sulfate is use for eliminating the interference of chloride by replacing poisonous drug mercury sulfate. In addition, the solution can monitor standard water sample that CODcr value is between 0-150mg / l and 0-1500mg / l and the chloride is below 800mg / l. Therefore, the solution is applicable for sewage at sewage disposal factories in the majority of cities. With the wide use scope, the solution is environmental friendly and can reduce use cost. Without any mercury sulfate in the solution, the damage of the poisonous drug to operators is avoided, and the security of operation is improved.

Description

technical field [0001] The invention belongs to a method for monitoring chemical oxygen demand in sewage, in particular to a digestion solution for monitoring chemical oxygen demand in sewage using a closed digestion colorimetric method. Background technique [0002] Chemical oxygen demand (CODcr) is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample. There are many monitoring methods for CODcr, including potassium dichromate method, coulometric method, energy-saving heating method and closed digestion colorimetric method. The closed digestion colorimetric method utilizes potassium dichromate (k 2 Cr 2 o 7 ) and other special oxidants (digestion solution), digested at high temperature (150°C) for two hours, and let monochromatic light pass through the solution, and use the colorimetric method to measure the content of trivalent chromium ions in the solution, and then calculate The CODcr content in the solution can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/28
Inventor 田庆玲张爱星何树忠佟达志王硕
Owner TIANJIN CAPITAL ENVIRONMENTAL PROTECTION GRP CO LTD
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