1989 Volume 5 Issue 4 Pages 415-417
Polyurethane foam, polyether type, has been recommended as an efficient collector in separating and concentrating some selected chlorinated insecticides and polychlorinated biphenyls from aqueous media. In the present work, the collection and recovery of Baythroid, CME-134 and the ethyl derivative of Sumicidine insecticides from water were examined using static and columns foam extraction modes. The extraction isotherm of the three insecticides tested exhibited a first order behavior in the low concentration. Insecticides were successfully retained on the foam column at reasonable flow rates. The collected insecticides were recovered from the foam material with 100 cm3 acetone in a Soxhlet extractor, and their concentrations were then measured spectrophotometrically. The application of the developed method for the extraction of the above mentioned insecticides in Nile river water has been evaluated.
