The organophosphate pesticide malathion is hydrolysed in alkaline medium to dimethyl dithiophosphate (DMDSP) sodium fumarate and ethanol. The DMDSP reacts with bismuth (III) to form a complex which is extracted in methyl isobutyl ketone (MIBK). The bismuth is determined in organic phase using air acetylene ne flame atomic absorption. The concentration of bismuth is proportional to malathion in solution. The linear calibration range and detection limits for DMDSP were evaluated. Finally a commercial sample of malathion was analysed for the contents of malathion.
I A QAZI ,M Y KHUHAWAR ,A H CHANAR ,
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