Indirect Spectrophometric Determination of Fly-Fighter Insecticide in Agricultural & Environmental Samples.

Abstract

Indirect spectrophotometric method is developed for the determination of widely used organophosphorus insecticide Fly-Fighter. The method is based on alkaline hydrolysis of Fly-Fighter to dichloroacetaldehyde followed by benzoic acid in alkaline medium. The absorption maxima of the reddish-brown dye formed is measured at 510 nm. Beer’s law is obeyed over the concentration range of 2.3 to 25 µg in a final volume of 25 ml (0.092-1.00 ppm). The molar absorptivity, Sandell’s sensitivity and correlation coefficient were found to be 1.8x10⁴ l mole^-1cm^-1, 0.002 µg cm^-2 and 09989 respectively. The lower limit of detection is about 0.001. The standard deviation and relative standard deviation were found to be ± 0.002 and 1.98% respectively. The method is simple sensitive and free from interferences of other pesticides and diverse ions. Other organophosphorous pesticides do not interfere with the proposed method. The method is simple, fast and has been satisfactorily applied to the determination of Fly-Fighter in agricultural & environmental samples.

Key Words : Spectrophotometer, Fly-Fighter, Benzoic Acid Agricultural, Environmental Samples.