Titration endpoint determination method for ORP (oxidation-reduction potential) value of permanganate index type 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] The invention relates to a permanganate index water quality analyzer, in particular to a permanganate index water quality analyzer for judging the titration end point by an ORP electrode method. Background technique [0002] Because the permanganate index in water quality can reflect the water quality pollution status of drinking water, source water and surface water to a certain extent. Therefore, the permanganate index is a common indicator reflecting the pollution of organic and inorganic oxidizable substances in clean and relatively clean water bodies. 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 c...

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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