Spectrophotometric determination of isoproturon or metoxuron using p-dimethylaminobenzaldehyde
Abstract
A spectrophotometric method for the determination of isoproturon (IPN) or metoxuron (MTN) based on their reaction with p-dimethylaminobenzaldehyde under acidic conditions is described. The absorption maxima of the coloured compounds formed are observed at 438 and 444 nm and the molar absorptivities are 3.09 × 104 and 3.85 × 104 l mol–1 cm–1 for IPN and MTN, respectively. The relative error is <1%. The method is simple and convenient and was applied successfully to the determination of IPN or MTN in technical-grade samples and formulations.