Sensitive spectrophotometric method for the determination of propoxur using 4-aminoantipyrine.

The use of 4-aminoantipyrine for the colorimetric determination of propoxur in pesticide formulations and water samples is described. The method is based on the alkaline hydrolysis of the pesticide and the resultant phenol is reacted with 4-aminoantipyrine in the presence of an oxidizing agent. The resultant colored dye is extracted into chloroform and the absorbance measured at 472 nm.