Malathion in alkaline solution is hydrolysed to dimethyldithiophosphate (DDTP), which is used as a complexing reagent for the HPLC separation and quantitative determination of bismuth(III), copper (II) and palladium (II) in a mixture. The complexes extracted in chloroform are eluted from normal phase HPLC column (250 x 4 mm id) Licrosorb, Si, 100, 5 mu with chloroform:acetonitrile:1,2-dichloroethae (25:70:5 v/v/v) with a flow rate 0.8 ml/min. The detection was at 295 nm Linear calibration for each of bismuth(III), copper(II) and palladium(II) were obtained with 12.5-62.5 mu g/ml of chloroform and detection limits were 0.1-0.2 ng/injection. The method was applied for the determination of copper in copper wires and palladium in plalladium-barium sulphate.
A H CHANNAR ,S N LANJWANI ,M Y KHUHAWAR ,
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