A method for rapid determination of high chlorine wastewater cod
A high-chlorine wastewater, rapid determination technology, applied in material analysis by observing the effect of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of long digestion time, skin burns, easy splashing, etc. , to achieve the effect of improving operability, improving work efficiency and improving safety
Active Publication Date: 2017-10-20
NINGBO DADI CHEM ENG & ENVIRONMENTAL PROTECTION
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Disadvantages: The concentration of chloride ions in industrial wastewater is high, which has a great impact on the experimental results. Although a certain amount of masking agent has been added, the effect is not very good; sulfuric acid has strong chemical corrosion, and it is easy to splash during the addition process The potassium dichromate method needs to add sample, potassium dichromate, mercury sulfate, sulfuric acid-silver sulfate solution, and distilled water successively during digestion with potassium dichromate method. longer
The experimental results are not very satisfactory. After digestion, precipitation and turbidity will occur. After centrifugation, the supernatant is taken for testing. The experimental results have great deviations.
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[0012] The present invention will be further described in detail below in conjunction with specific embodiments: a method for quickly measuring the COD of high-chlorinated wastewater, comprising the following steps: (1), testing the chloride ion concentration of the water sample; (2), adding water to the water sample according to the chlorine content Dilute with distilled water and control the chlorine content below 2000mg / l; (3) Preparation of COD digestion solution: Take 2.65 grams of potassium dichromate dissolved in 30 ml of concentrated sulfuric acid and 60 ml of distilled water and titrate to 100 ml with distilled water, then mix with 500 ml of 1% sulfuric acid-silver sulfate solution is mixed and stored for later use; (4) Take 5 ml of the diluted water sample and add 5 ml of COD digestion solution, and take the diluted water sample and add 5 ml of distilled water to digest it for 12-25 minutes with a COD digestion apparatus respectively. Cool to room temperature; (5) Put...
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The invention discloses a method for quickly measuring the COD of high-chlorine wastewater, which comprises the following steps: 1. testing the chloride ion concentration of a water sample; 2. diluting the water sample with distilled water according to the chlorine content, and controlling the chlorine content below 2000 mg / l; 3. Preparation of COD digestion solution: Take 2.65 grams of potassium dichromate and dissolve it in a mixture of 30 milliliters of concentrated sulfuric acid and 60 milliliters of distilled water and titrate it to 100 milliliters with distilled water, then mix it with 500 milliliters of 1% sulfuric acid-silver sulfate solution and store it for later use; 4 1. Take 5ml of the diluted water sample and add 5ml of COD digestion solution, and take the diluted water sample and add 5ml of distilled water to digest with COD digestion apparatus for 12-25 minutes respectively, and cool to room temperature; 5. Put the digested solution into the titration bottle respectively Add 2-3 drops of o-phenanthroline-ferrous indicator, titrate with 0.05 mol per liter ferrous ammonium sulfate solution until the solution is reddish brown, record the titration volume V0, V1, this method can measure COD more quickly and accurately .
Description
technical field [0001] The invention belongs to the technical field of waste water COD detection, in particular to a method for quickly measuring high chlorine waste water COD. Background technique [0002] The prior art is mainly the traditional potassium dichromate method and the determination of the chemical oxygen demand of water quality rapid digestion spectrophotometry. The traditional potassium dichromate method is: add a known amount of potassium dichromate solution to the sample, use silver sulfate as a catalyst in a strong acid medium, and titrate with ferrous ammonium sulfate solution after high temperature digestion. The determination of water quality chemical oxygen demand is different from the rapid digestion spectrophotometric method in that the colorimetric method is used to measure COD after digestion. Disadvantages: The concentration of chloride ions in industrial wastewater is high, which has a great impact on the experimental results. Although a certain ...
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IPC IPC(8): G01N21/78
Inventor 汤立周金海张燝锴仇兴欢蒋奇军官徐林
Owner NINGBO DADI CHEM ENG & ENVIRONMENTAL PROTECTION