Spectrophotometric determination of deltamethrine in pure and environmental samples

An accurate and sensitive spectrophotometric method has been developed for the determination of deltamethrine (DLM) [(S)-Cyano-(3-phenoxyphenyl)-methyl] 3-(2, 2-dibromoethenyl)-2, 2-dimethyl-cyclopropane-1-carboxylate by reduction of 2, 3, 5-triphenyltetrazolium (TET) by cyanide ion yield from methanolic alkaline hydrolysis of DLM and subsequent react with p-nitrobenzyldehyde to form a good reduction agent for TET to yield the formazan has maximum absorption at 483 nm. Maximum colour absorption was attained in 15 min in the presence of 0.5 N NaOH. In addition to the considerably high values of the molar absorptivity of the chromogen formed, ideal adherence of the colour absorption to the Beer‐Lambert law permitted a sensitive micro and nano determination of DLM in both pure and environmental samples. The Beer's law was obeyed over the concentration range of (0.1-3) µg mL⁻¹. The analytical parameters were evaluated in the proposed method and have been successfully applied for the determination of DLM in its formulations and environmental samples. The aim of this study is it to develop rapid sensitive analytical method to evaluate the micrograms of DLM in various samples. (paper)