Jan 10, 2009

Vertical fluxes and accumulation of organochlorine pesticides in sediments of Haihe River, Tianjin, China

Bulletin of Environmental Contamination and Toxicology
Jie Chi

Abstract

Organochlorine pesticides (OCPs) concentrations in sediments and sediment trap fluxes of particulate organic carbon and OCPs were measured from October 2006 to May 2008 in the urban reach of Haihe River, Tianjin, China, in order to investigate vertical fluxes and accumulation of OCPs in sediments. The concentrations of OCPs in sediments (dry weight basis) were in the range of 2.08-10.07 ng/g (mean 4.70 ng/g) for HCHs (alpha-, beta-, gamma-, delta-HCH), 5.82-43.39 ng/g (mean 17.43 ng/g) for DDTs (p,p'-DDE, p,p'-DDD, o,p'-DDT, p,p'-DDT). Compared with data reported in Haihe River 2003, the levels of OCPs showed a significant decrease between 2003 and 2008. This is mainly attributed to significant decrease of production and usage of HCHs and DDTs and biodegradation of HCHs and DDTs in sediment. Concentrations of HCHs and DDTs in sediments were well correlated with sediment organic carbon contents. Concentrations of OCPs in settling particles (dry weight basis) ranged from 21.2 to 138.4 ng/g (mean 52.6 ng/g) for HCHs, 30.0-245.7 ng/g (mean 87.1 ng/g) for DDTs, which were 2.2-48.2-fold higher than those associated with sediments. beta-HCH was the dominant HCH isomer in both sediments and settling particles. Among DDTs, p,p'-DDE was ...Continue Reading

Mentioned in this Paper

Hydrocarbons, Chlorinated
Sediments, Marine
Water Movements
DDT (Insecticide)
Gamma-666
Streams
Landfill Leachate
Dichlorodiphenyl Dichloroethylene
Sedimentation Procedure
Bioremediation

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