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

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...

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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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