Judgment method of orp value titration end point of permanganate index water quality analyzer

Abstract

The invention relates to a permanganate index type water quality analyzer, in particular to a permanganate index type water quality analyzer for determination of a titration endpoint in an ORP (oxidation-reduction potential) electrode method. In the titration endpoint determination method for the ORP value of the permanganate index type water quality analyzer, the maximum ORP_A of the ORP value is obtained in the first phase of each measurement, the minimum ORP_B of the ORP value is obtained in the second phase of the measurement, and ORP_K is calculated as the determined ORP value for the titration endpoint of the measurement through ORP_K = [(ORP_A) - (ORP_B)] * 30% + (ORP_B). Therefore, the ORP value for each titration endpoint is dynamically determined, errors in determination caused by ORP aging and drifting can be eliminated, and maintenance avoidance and accurate determination can be effectively achieved during the service life of the whole ORP electrode.

Description

technical field [0001] 本发明涉及高锰酸盐指数水质分析仪,尤其涉及通过ORP电极法判定滴定终点的高锰酸盐指数水质分析仪。 Background technique [0002] 由于水质中高锰酸盐指数可在一定程度上反映饮用水、水源水和地面水的水质污染状况。 因此,高锰酸盐指数是反映清洁和较清洁水体中有机和无机可氧化物质污染的常用指标。 Nitrite, ferrous salt, sulfide and other reducing inorganic substances in water and organic substances that can be oxidized under these conditions can consume potassium permanganate, so the permanganate index is often used as the surface water subject to organic pollution. This standard uses potassium permanganate to oxidize certain organic and inorganic oxidizable substances in water samples, and calculates the equivalent amount of oxygen from the amount of potassium permanganate consumed. [0003] The permanganate index is a conditional relative index that reflects the pollution of organic and reducing inorganic substances in cleaner water bodies. Because its measurement results are related to the acidity of the solution, the concentration of the potassium permanganate standard solution, the h...

AI Technical Summary

Problems solved by technology

But in practical application, as the ORP electrode ages, and the ORP electrode is polluted (dirty) during use, the titration curve will be figure 2 Situation of "Titration Curve 1, 2" shown

Therefore, using the absolute value as the basis for judging the titration end point requires frequent calibration of the OPR potential in actual use, and if there is electrode contamination in the measurement, the measurement result will be wrong

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