Abstract − Analytical Sciences, 20(12), 1707 (2004).
Sensitive Determination of Propoxur by Spectrophotometry Using 3-Aminopyridine
Abburi HEMASUNDARAM and Nutalapati Venkatasubba NAIDU
Department of Chemistry, Sri Venkateswara University, Tirupati-517 502, India
A simple spectrophotometric method for the determination of propoxur, a widely used insecticide, in various environmental samples and pesticide formulations is described. The method is based on the coupling of the hydrolysis product of propoxur with diazotized 3-aminopyridine in an alkaline medium, to form an azo-dye which has a maximum absorbance at 463 nm. Beer’s law is obeyed over the concentration range of 0.05 to 1.2 µg ml-1 of propoxur. The molar absorptivity and Sandell’s sensitivity are found to be 3.10 × 104 l mol-1 cm-1 and 0.007 µg cm-2, respectively. The important analytical parameters and optimum reaction conditions were evaluated. The method is free from the interference of other commonly used pesticides and inorganic metal ions.
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