Forced volatilization or sweep extraction of organochlorine pesticide from vegetable extracts

Selective partition by vapor solvent sweeping, on borosilicate wool, of organochlorine pesticides from fruit and vegetable extracts in the present apparatus and with the present technique provides sufficient cleanup for subsequent electron capture detector analysis. Amounts of organochlorine pesticides from 0.02 to 0.1 p.p.m. in fruits and vegetables are quantitatively recovered and can be analyzed by this method. This study, like those of GUNTHERet. al. (2,3) with organochlorine pesticide residues in butterfat and in alfalfa and of STORHERR and WATTS (4) with organophosphate pesticides in several fruits and vegetables confirms that forced volatilization cleanup is a promising method.