T/CAIA SH026-2025 Determination of Total Organic Carbon in Water and Drinking Water Using Automatic Titration Method for High-Manganese Oxide Index

Scope

Scope: This document describes the method for determining the permanganate index using automatic titration. This document is applicable to the determination of the permanganate index in surface water and drinking water. The method has a detection limit of 0.13 mg/L and a measurement range of 0.50 mg/L to 4.50 mg/L for water samples. The chloride ion concentration in the water samples should not exceed 300 mg/L. For other types of water samples, this document can be referenced for implementation. Main technical content: In an acidic solution, under the condition of heating in a boiling water bath, some reducing substances in the water samples and potassium permanganate undergo an oxidation reaction. The excess potassium permanganate remaining after the digestion is reduced by an excess of sodium oxalate. The excess sodium oxalate is titrated with a standard solution of potassium permanganate, and the permanganate index in the water samples is calculated accordingly.

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