CHLORSULFURON EXTRACTION AND PURIFICATION FROM A COMMERCIAL FORMULATION (GLEAN 75DF)

Two methods for isolation of a sulfonylurea herbicide from a formulati on were developed. They are based on the different solubility of a.i. (active ingredient) in: a) water at different pHs and b) in Water/Dich loromethane system. The purity of the extracts was checked by melting point and HPLC analyses against two certified standards. On melting, C hlorsulfuron degrades. Strategy b) yields the purest product (about 10 2%) with a recovery rate of 75%, while a) is superior for recovery rat e (about 85%) but poorer in purity (about 90%).