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7563101 
Journal Article 
A new method for the determination of some organophosphate insecticides 
Tiwari, AK; Dubey, BK; Shukla, IC 
2003 
Yes 
Journal of the Indian Chemical Society
ISSN: 0019-4522 
80 
7 
717-719 
WOS:000184920200016 
A quick and convenient method has been developed for milligram determination of some organophosphate insecticides. The sample is allowed to react with a calculated excess of (0.1 N) chloramine-T reagent in the presence of glacial acetic acid for 10-15 min at room temperature. After the reaction is over, Kl solution (10%) is added and the unreacted reagent is back-titrated with I N solution of sodium thiosulfate to starch end-point. The method is applied for the determination of technical preparations of malathion (95%), dimethoate (90%), ethion (95%) and phorate (97%). The results are within the error of +/- 1.0%.