DETERMINATION OF TRACE ORGANOCHLORINATED PESTICIDES AND POLYCHLORINATED-BIPHENYLS IN WATER

A modified steam distillation liquid-liquid extraction (SDE) device is developed for the enrichment of trace organochlorinated pesticides (O CPs) and polychlorinated biphenyls (PCBs) in up to one litre of water samples. One ml of n-hexane is sufficient to extract the analytes. The extract can be analysed directly by a capillary gas chromatography-el ectron capture detector. The recoveries range from 84.6 to 102.3% for OCPs and 80.5 to 105.2% for PCBs, respectively. Matrice materials such as lipids and humic substances were removed by the SDE method from th e extract and no further cleanup and concentration steps were needed.