Abstract
A method for the indirect spectrophotometric determination of H2O2 is based on its oxidation with chlorine in basic medium and measurement of the unreacted Cl2 by the colour reaction with o-tolidine at 438 nm. The effective molar absorptivity for H2O2 with o-tolidine is 5.37×104 mol−1 cm−1 at pH 1.7. The lower limit of determination is 1.85×10−7 mol/l or 6.29 ppb. Br−, I−, NO−2, Pb2+ and Sn2+ interfere even in small amounts, but are not present in commercial H2O2.
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