A new method for the determination of dithiocarbamate fungicides using n-bromosuccinimide reagent

A simple and convenient method has been developed for the determination of Dithiocarbamate fungicides e.g. Ziram, Thiram, Ferbam, Zineb and ZDC in technical form and in their formulations. Aliquots containing 1-5 mg of the sample were taken in a 100ml conical flask and 5ml of 0.02 N,N-Bromosuccinimide (NBS), 10ml of glacial acetic acid and 5ml of 4 N HCI were added to it. The contents were shaken well and allowed to react for prescribed time at room temperature. 5 ml of 10% potassium iodide was added to it and kept for a minute. The liberated iodine was titrated against 0.02 N standardised sodium thiosulphate solution using starch as indicator. A blank experiment was also run under identical conditions using all the reagents except the sample. By the calculation of coefficient of variation (C.V.) and standard deviation (SD) values, it becomes evident that the suggested method is reproducible and precise.