Method capable of accurately determining chemical oxygen demand in water

Abstract

The invention discloses a method capable of accurately measuring chemical oxygen demand in water. Accurately absorb 10.00mL of potassium dichromate standard solution into a 500mL conical flask, add water to dilute to about 110mL, slowly add 30mL of concentrated sulfuric acid, and add 3 drops of test Ferrous spirit indicator solution, titrate with ferrous ammonium sulfate solution, the color of the solution changes from yellow to blue-green to reddish brown as the end point; add 5g of silver sulfate to 500mL of concentrated sulfuric acid; take 20.00mL of uniformly mixed water sample and place it in 250mL Accurately add 10.00mL potassium dichromate standard solution and a few small glass beads or zeolite to the ground-mouth reflux conical flask, connect the ground-mouth reflux condenser, and slowly add 30mL sulfuric acid-silver sulfate solution from the top of the condenser Get 20.00mL double distilled water, do blank test according to the same operation steps, record the consumption of ferrous ammonium sulfate standard solution when titrating the blank, you can get the chemical oxygen demand in the water. The method can accurately measure the chemical oxygen demand in water, determine whether it meets the requirements of environmental protection, and avoid direct discharge into the environment to cause environmental pollution.

Description

technical field [0001] The invention relates to a method, in particular to a method capable of accurately measuring chemical oxygen demand in water. Background technique [0002] Drinking water refers to water that can be directly supplied to the human body for drinking without treatment. Water is the main component of body fluid, and is an important substance that constitutes cells, tissue fluid, plasma, etc. As the medium of all chemical reactions in the body, water is a platform for the transportation of various nutrients and substances. With its 40% market share, packaged drinking water has firmly ranked the top spot in the national beverage market. In the industry, pure water, natural mineral water and mineral water manufacturers account for the largest proportion. Consumers' preferences for drinking water have changed, and the strategic focus of enterprises has also shifted to natural mineral water following the market. From January to December 2011, the national o...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned existing factory etc. discharge waste water and come out, do not carry out accurate measurement to its chemical oxygen demand, cause the problem of serious environmental pollution, have designed a kind of method that can accurately measure chemical oxygen demand in water, This method can accurately measure the chemical oxygen demand in water, determine whether it meets the requirements of environmental protection, avoid direct discharge into the environment and cause environmental pollution, and solve the problem of the existing factories and other wastewater discharges without accurate chemical oxygen demand. Determination, causing serious environmental pollution problems