Improved cleanup technique for the estimation of endosulfan and endrin residues.

An improved cleanup technique has been developed for the extraction of endosulfan and endrin from crops. The technique involves the use of Nuchar C-190N as adsorbent and a mixture of n-hexane and acetone (4+1) as the eluting solvent. The mean percentage recoveries of endosulfan (I and II) and endrin from plant tissue extracts fortified at levels of 0.5-2.0 ppm varied from 86 to 102 and 97 to 100, respectively.