Polarographic Behavior of N-Bromosuccinimide at a Rotating Platinum Electrode and Amperometric Determination of Hydrazine Sulfate with N-Bromosuccinimide

Abstract

The Polarographic behavior of N-bromosuccinimide (NBS) at a rotating platinum electrode (RPE)was investigated. NBS gave a well-defined reduction wave in an electrolyte solution containing 0.1MKNO₃ and Britton-Robinson buffer at pH 5.0. The wave obtained at a RPE with the activated surface, resulting from the reduction of platinum oxide layer on the preoxidized electrode, showed the half-wave potential at +0.75V vs. SCE. The diffusion current at -0.2V was directly proportional to the concentration over the range from 10^-3 to 2×10^-5 N NBS, and its temperature coefficients was 1.8%/°C at 25°C The number of electron involved in the electrode reaction of NBS was 2. Hydrazine sulfate over the concentration range from 10^-3 to 3×10^-5 N could be determined amperometrically with NBS by use of a RPE within an error of ±2%.