Temporal and spatial distributions of Organophosphorus pesticides in the seawater and sediment of Sanggou Bay
桑沟湾水体及沉积物中有机磷农残时空分布特征

Six cruises were completed in the period from April 2009 to February 2010 to investigate the concentrations of eight Organophosphorus pesticides (OPPs) in Sanggou Bay. With GC-MS with external standard quantitative method, the temporal and spatial distributions and the composition of OPPs were analyzed. The results showed that six compounds of OPPs in seawater from the Sanggou Bay were detected, and methyl-parathion, malathion and parathion were detected in every cruise. The horizontal distribution of OPPs in the sediment showed that the concentration decreased gradually from bay mouth to inner area. The seasonal distribution of OPPs showed that the concentration of OPPs reached its maximum in October, and was the intermediate level in April, June and August, and hit lowest level in December and February. Compared with other waters at home and abroad, the total concentration of OPPs was at the lower level in Sanggou Bay, and the concentration of OPPs such as methyl-parathion, malathion was also at the lower level.