In the present communication a sensitive spectrophotometric method is proposed for the determination of widely used pesticide endosulfan. The method is based on the liberation of sulphur dioxide from endosulfan by adding acid reagent and alcoholic potassium hydroxide. The liberated sulphur dioxide is then passed through potassium iodate solution and the iodine liberated is then reacted with N-chlorosuccinimide and leuco crystal violet. The absorbance of crystal violet dye formed is measured at 592nm. Beer's law is obeyed in the range of 0.004-0.048ppm. The molar absorptivity and Sandell's sensitivity were found to be 8.08*10~5 Lmol~(-1)cm~(-1) and 0.005 μgcm~(-2) respectively. The method has been applied for the determination of endosulfan in water, soil and vegetables.
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