A new and highly sensitive spectrophotometric method was developed for the determination of widely used organophosphorous insecticide chiorpyriphos. The method is based on alkaline hydrolysis of chiorpyriphos to l,2,4atrichlropyridine, followed by coupling with diazotized p-aminobenzoic acid in alkaline medium. The absorption maxima of the wine red dye compound formed was measured at 520nm. Beer’s law was obeyed over the concentration range of 1.2 to 18 pg in a final solution volume of 25 ml (0.048-0.72 ppm). The mol & absorptiv ity, Sandel l’s sensitivity and correlation coefficient were found to be 1. 8x I o4 (+ 100) mole” cm”, 0.011 ,ug cth’2 and 09989, respectively. The standard deviation and relative standard deviation were found to be * 0.005 and 2.02 %, respectively. The method was simple sensitive and free, from interferences of other pesticides and diverse ions. Other organophosphorous pesticides did not interfere with the proposed method. The method was satisfactorily aplied to the determination of chiorpyriphos in environmental and biological samples.
V K GUPTA ,E K JANGHEL ,J K RAI ,S KHAN ,M K RAI ,
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