Method for measuring chemical oxygen demand of water by rapid digestion method

A technology of water quality chemistry and determination method, which is applied in the direction of material analysis through observation of the influence of chemical indicators, analysis through chemical reaction of materials, preparation of test samples, etc., which can solve burns, improper operation of operators, etc. problems, to achieve the effect of less pollution, accurate test results, and simple and easy-to-operate determination process

Pending Publication Date: 2020-11-24
浙江越鉴检测技术有限公司
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Problems solved by technology

[0003] The Chinese invention patent with the application number CN201811405123.8 and the title of "Organic Wastewater COD Online Detection Method" proposes a water quality COD detection method. During the detection process, a return pipe needs to be connected to a high-temperature heating digester. For the above-mentioned related technologies, the inventor believes that there are defects. In the actual operation process, in order to ensure the accuracy of the experiment and the correct use of the instrument, the COD digester should be used after the heating is constant, and then the temperature is constant. Put the conical flask on the base, and then align the burr return tube with the mouth of the conical flask one by one, the operator may be burned due to improper operation

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  • Method for measuring chemical oxygen demand of water by rapid digestion method
  • Method for measuring chemical oxygen demand of water by rapid digestion method
  • Method for measuring chemical oxygen demand of water by rapid digestion method

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Experimental program
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Effect test

Embodiment 1

[0055] Reagents required:

[0056] Sulfuric acid: ρ=1.84g / ml, superior grade pure.

[0057] Sulfuric acid-mercuric sulfate solution: the concentration of mercury sulfate solution is 100g / L, weigh 10g of mercury sulfate, dissolve in 100ml of sulfuric acid solution, and mix well.

[0058] Potassium dichromate standard solution: Accurately weigh 12.258g of potassium dichromate and dissolve it in water, make it to 1000ml, c=0.25mol / L; then dilute it 10 times, c=0.025mol / L.

[0059] Sulfuric acid-silver sulfate solution: Weigh 10g of silver sulfate and add it to 1L of sulfuric acid 1.84, let it dissolve for 1-2d, and mix well.

[0060] Ferrous indicator solution: The ferrous indicator solution is 1,10-phenanthroline indicator solution, dissolve 0.7g ferrous sulfate heptahydrate in 50ml water, add 1.5g 1,10-phenanthroline, stir until dissolved , diluted to 100ml.

[0061] Ferrous ammonium sulfate standard solution: Weigh 19.5g of ferrous ammonium sulfate and dissolve it in water,...

Embodiment 2

[0098] Reagents required:

[0099] Sulfuric acid: ρ=1.84g / ml, superior grade pure.

[0100] Sulfuric acid-mercuric sulfate solution: the concentration of mercury sulfate solution is 100g / L, weigh 10g of mercury sulfate, dissolve in 100ml of sulfuric acid solution, and mix well.

[0101] Potassium dichromate standard solution: Accurately weigh 12.258g of potassium dichromate and dissolve it in water, make it to 1000ml, c=0.25mol / L; then dilute it 10 times, c=0.025mol / L.

[0102] Sulfuric acid-silver sulfate solution: Weigh 10g of silver sulfate and add it to 1L of sulfuric acid 1.84, let it dissolve for 1-2d, and mix well.

[0103] Ferrous indicator solution: The ferrous indicator solution is 1,10-phenanthroline indicator solution, dissolve 0.7g ferrous sulfate heptahydrate in 50ml water, add 1.5g 1,10-phenanthroline, stir until dissolved , diluted to 100ml.

[0104] Ferrous ammonium sulfate standard solution: Weigh 19.5g of ferrous ammonium sulfate and dissolve it in water,...

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Abstract

The invention relates to a method for measuring chemical oxygen demand of water by a rapid digestion method. The method comprises the following steps: sequentially adding a mercury sulfate solution, apotassium dichromate standard solution and explosion-boiling-resistant glass beads into a water sample, uniformly shaking, accurately placing a conical flask on a heating base before the heating baseis heated, mounting burr return pipes, and matching the conical flask with the burr return pipes one by one, clamping the conical flak on a first clamp, clamping the burr return pipe on a second clamp, allowing a lifting column to ascend through thread running fit, allowing the conical flask and the burr return pipes also to ascend while the lifting column ascends, and adding a silver sulfate-sulfuric acid solution to the upper openings of the burr return pipes; and starting the heating base for heating, starting to digest after the temperature of the heating base is constant, and calculatingthe chemical oxygen demand after the digestion is finished. The method has the advantages that the chemical oxygen demand in the water is measured through the dichromate method, the detection resultis accurate, the measurement process is simple and easy to operate, and pollution is small.

Description

technical field [0001] The present application relates to the field of water quality detection and analysis, in particular to a method for measuring water quality chemical oxygen demand rapid digestion method. Background technique [0002] With the growth of the world's population and the development of industry and agriculture, water consumption is increasing day by day. At the same time, due to human production and life, the surface and groundwater bodies are polluted, and the water quality not only deteriorates, but also makes the limited water resources more tense. Our country is In countries that lack fresh water resources, water pollution has led to various vicious incidents in the newspapers in recent years. Strengthening law enforcement and supervision of water pollution and improving the efficiency of water quality monitoring and testing by testing departments are important means to control water pollution in our country. In the field of environmental protection, ch...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/44G01N1/38
CPCG01N21/78G01N1/44G01N1/38
Inventor 孟香琳汪佳豪曾琳琳
Owner 浙江越鉴检测技术有限公司
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