Kr. Raju et al., SPECTROPHOTOMETRIC DETERMINATION OF ISOPROTURON AND METOXURON USING ETHYLACETOACETATE AND APPLICATION TO TECHNICAL AND FORMULATION GRADE SAMPLES, Talanta, 43(4), 1996, pp. 577-581
A simple and rapid spectrophotometric method for the determination of
Isoproturon and Metoxuron is described based on alkaline hydrolysis of
the compounds to their corresponding primary amines, followed by diaz
otization and coupling with ethylacetoacetate in alkaline medium. The
chromogenic species obeys Beer's law up to 15 and 9 mu g ml(-1) for Is
oproturon and Metoxuron respectively. The method is successfully appli
ed for technical and formulation samples with RSD in the ranges 0.48-0
.72, 0.86-1.32 and 0.66-0.74, 0.27-0.69 for technical and formulation
grade samples of Isoproturon and Metoxuron respectively. The advantage
s over the earlier methods are discussed.