Method for fast measuring biochemical oxygen demand in water

Abstract

The invention discloses a method capable of rapidly measuring biochemical oxygen demand in water, which comprises dissolving anhydrous calcium chloride in water; dissolving ferric chloride in water; and dissolving glucose and glutamic acid in water after drying; Put a certain amount of water in the glass bottle, control the water temperature, aerate the water with an oil-free air compressor or membrane pump, take 100mL of neutralized water sample, add 1+1 acetic acid 10mL, 10% potassium iodide solution 1mL , using starch solution as indicator, titrate free iodine with sodium sulfite standard solution, and calculate the amount of sodium sulfite solution needed in the water sample according to the volume and concentration of sodium sulfite standard solution consumed; Inside, use the siphon method to add part of the dilution water, and then add the amount of water sample calculated according to the volume of the bottle and the dilution ratio. In the BOD5 measurement, the sodium azide correction method is used to measure the dissolved oxygen. The method has the advantages of simple and convenient measurement process, less procedures, accurate measurement results and high efficiency, and can meet the development needs of enterprises.

Description

technical field [0001] The invention relates to a method, in particular to a method capable of rapidly measuring biochemical 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 waste water for the complex detection process of this type, low efficiency, and the large error of the measurement results, easy to cause pollution, and does not meet the requirements of the environmental protection department. The method of biochemical oxygen demand has simple and convenient measurement process, fewer procedures, accurate measurement results, and high efficiency, which can meet the development needs of enterprises, reduce environmental pollution, and solve the complex detection process of this type in existing wastewater. , the efficiency is low, and the error of the measurement result is large, it is easy to cause pollution, and it does not meet the requirements of the environmental protection department.