The Determination of Dimexan in Crops
Abstract
Srrrrur* (Clarence House, 6, Clarence Road, Norwich, NOR 297) Residues of Dimexan on vegetables and other crops can be determined by treating the sample with ethanolic sodium hydrosulphide, then boiling with dilute sulphudc acid and absorbing the CS, evolved in a modified Viles’ reagent. The colour developed is measured spectro-photometri cally, With onions, high results were obtained in recovery tests unless the onions were fresh and examined at once. Bdtain (Dimexano in Europe) is bis-(methyl-xanthic) disulphide, CHaO-C-S-S-C-OCH3. It is used as a haulm-killer and defoliant. At ordinary summer temperatures in Britain it is a fairly volatile oil.
Citation
Journal of the Association of Public Analysts, 1968, 6, 20-24
