Permanganate index on-line monitoring automatic titration determination method and device

Abstract

The invention discloses a permanganate index on-line monitoring automatic titration determination method and device; based on an automatic measurement flow, an end point is jointly determined with cooperation of two ways of absorbance and electric potentials, and the relationships of the changes of the solution absorbance and the electric potentials with the titration volume are simultaneously used in the titration determination method, staging and selective design is performed for the entire titration process, and different titration speeds are adopted in different titration stages so as to ensure the accuracy of the titration. Two conditions of the absorbance and the electric potentials are used at the same time; when the solution not only meets conditions of photometric determination ofthe end point but also meets the conditions of electrode determination of the end point during automatic titration, the titration is determined to reach the end point; through a specific titration algorithm and the determination way, the method and device solve the problems that the electric potential generates aging and drifting because a traditional photometric method is interfered by water colors, turbidity and other factors and an ORP electrode is used for a long time.

Description

technical field [0001] The invention relates to the technical field of water body monitoring, in particular to a titration determination method for permanganate index in water body and a related device. Background technique [0002] The permanganate index refers to the potassium permanganate (KMnO 4 ) is the oxidizing agent, the amount of oxidizing agent consumed when processing the water sample, and its unit is mg / L of oxygen (O 2 , mg / L). The main function of this indicator is to determine the overall pollution of the water quality by characterizing the content of reducing substances in the water body. The country has issued an analytical method for the determination of permanganate index in water bodies. Its standard number is GB 11892-89 (determination of water quality permanganate index). The principle of the method is as follows: [0003] [0004] [0005] According to the principle of the national standard (GB 11892-89) for the measurement method of permangan...

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Problems solved by technology

[0008] Aiming at the defects of the prior art, the present invention provides a permanganate index on-line monitoring automatic titration determination method and its device which can avoid the defects of the single determination of the photometric method and the ORP electrode method, and have accurate measurement results and high long-term reliability.

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