| abstract |
A method for determining a substance in a sample through an oxidation-reduction reaction, which gives found values with excellent reliability. Prior to the oxidation-reduction reaction, a formazan compound is added to the sample to eliminate the influence of any reducible substances contained in the sample. Subsequently, a reduction or oxidation product derived from the substance to be assayed is caused to generate, and the amount thereof is measured by an oxidation-reduction reaction. The amount of the substance to be assayed is determined from the found value. The formazan compound may be, for example, 1-(4-iodophenyl)-3-(2,4-disulfophenyl)-5-(2,4-dinitrophenyl)formazan. |