[Contents of organochlorine pesticides in water, pore water and sediment in Minjiang River Estuary of China].

The concentrations of 18 organochlorine pesticides in water, pore water and surface sediment from Minjiang River Estuary were analyzed by GC-ECD, and confirmed by GC-MSD. The range of organochlorine pesticides was 0.532-1.82 micrograms/L at water, 4.54-13.7 micrograms/L at pore water, and 28.79-52.07 micrograms/kg at sediment. Compared with the results of other estuaries and gulfs (Pearl River Estuary, Jiulong River Estuary and so on), it showed that the pollution of organochlorines in Minjiang was some moderate. The concentration difference in surface water, middle water, bottom water, pore water and sediment, due to the higher affinity of these hydrophobic compound for sedimentary phase than to water and a potential flux of pollutants from sediment to overlying water. The predominance of beta-HCH, DDE, Heptachlor, Endosulfan II and Methoxychlor in all water, pore water and sediment were clearly observed. On average, DDE, beta-HCH, Endosulfan II occupied the most part of total DDTs, HCHs and Endosulfans respectively, indicated the fate of these parent compounds or congeners. At the same time, it was found that the positive relationship among the individual organochlorine components (HCHs, DDTs and Endosulfans), which indicated that the similar of the source and behavior for organochlorine pesticides.