A study on OCPs distribution,sources and risk in the sediment from Guanhe Estuary
HE Xin-ran1,2, DENG He-tian3, WANG Hua1, PANG Yong1, SONG Xiao-juan2, CAO Ya-li4
1. College of Environment, Hohai University, Nanjing 210098, China;
2. Lianyungang Environmental Monitoring Central Station, Lianyungang 222001, China;
3. School of the Environment, Nanjing University, Nanjing 210046, China;
4. Jiangsu Province Communications Planning and Design Institute Limited Company, Nanjing 210005, China
Abstract：In this study,OCPs (Organochlorine Pesticides) in surface and column sediments from Guanhe Estuary(taken in April,2011) were analyzed by GC-ECD and 210Pb methods.The results showed that OCPs concentrations in surface sediments ranged from nd (Not Detected) to 58.3×10-9 (dry weight),and the concentrations range among three sampled regions are,from highest to the lowest,intertidal zone,estuary area and Guanhe River.However,concentrations of O,P'-DDT were highest in the sediment from estuary area,compare to those from interidal zone or Guanhe River.Based on the studies in other areas in China,DDTs and HCHs concentrations around Guanhe estuary were average.OCPs concentrations in column sediments ranged from 2.0×10-9 to 850.0×10-9,with an average of 210.0×10-9,and the results also indicated that the OCPs were relatively low in 1990s and increased in 2000.These results were validated by the studies around the area,that there were new inputs of DDTs sources in this region during the study period.Meanwhile,the ecological risks were also evaluated according to Sediment Quality Guidelines (SQCs) applied in Canada.According to SQCs,the adverse effects of OCPs in this area mainly originated from contaminations of DDD and DDT,which could occur frequently.The study suggested that more research on risk assessment of OCPs need to be conducted in this area,and feasible solutions to restore sediment environments need to be formulated for Guanhe estuary.
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