Zero-Crossing Third-Derivative Spectrophotometry for the Simultaneous Determination of Allethrin and Piperonyl Butoxide in Aerosol and Shampou

Abstract

Third-derivative spectrophotometry, with zero-crossing technique of measurement, has been used for the determination of two-component mixture of allethrin and piperonyl butoxide with overlapping spectral bands. Beer's low was followed over the concentration ranges 10–25 and 10–40 ug ml⁻¹ of allethrin and piperonyl butoxide respectively.

The method, yielding accurate and precise results, has been satisfactorily applied to laboratory mixtures and to commercial formulations.