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Three sensitive spectrophotometric methods were developed for the determination of deltamethrin as synthetic pyrethroid in its formulations and environmental samples. The proposed methods were based on the hydrolysis of deltamethrin with ethanolic KOH to form 3-phenoxy benzaldehyde which condensation with anthranilic acid (Method A), 4-aminoantipyrine (method B) and 2-chlorophenyl hydrazine (method C) to form color product having λmax at 480, 495 and 552 nm, for methods A, B and C, respectively. The color derivatives were stable for 3, 5 and 6 days for methods A, B and C, respectively. The Beer’s law was obeyed over the concentration range of 0.2–2.0, 0.5-3.0 and 0.5–4.0 μg mL −1 for methods A, B and C, respectively. The molar absorptivity and Sandell’s sensitivity, detection and quantification limits were calculated. The proposed methods have been successfully applied for the determination of deltamethrin in its formulations and environmental samples.

Sensitive Spectrophotometric Determination of Deltamethrin Insecticide in its Formulation and Environmental Samples