Residue and risk assessment of DDTs in surface sediment and cultured shellfish along the Fujian coast, China
We measured the residual levels, distribution, and composition of dichloro-diphenyl-trichloroethane (DDTs) in areas containing cultured shellfish along the Fujian coast, China. In addition, we evaluated the risk posed by exposure to DDTs in this region. We collected 20 samples of surface sediment and 46 samples of cultured shellfish from 20 sites in August 2005 and 2006. We measured the residual DDT in each sample using gas chromatography. The residue ranged from 1.93 to 56.6 μg/kg (net weight, mean 15.8 μg/kg) in the surface sediment. Forty percent of samples' pollution indexes for the DDTs was between 0.697 and 2.83, which suggested there was a potential ecological risk for DDTs pollution on some extent. The DDT residues ranged from 2.04 Hg/kg to 107 μg/kg (net weight, mean: 21.7 Hg/kg) in the shellfish samples. These levels were below the Maximum Residual Limits published by the European Community, USA, and Japan, and met the sea food safety index set by the Chinese government. Assuming a person ingested a maximum of 50 g/(person-day) cultured shellfish, their intake of DDT would be well below the TDI regulated by WHO and RfD and suggested by US EPA, indicating that the health risk arising from exposure to DDTs is low. DDT residues in the surface sediment and shellfish were within the middle of the range reported in nearby domestic water sources, but were relatively high when compared with those reported in water within the Asia-Pacific region. The relative composition of DDT isomers suggested that there has been input into this area in recent years.
国家科技期刊平台
NSTL
万方数据
维普
