title: Contamination characteristics of organochlorine pesticides in multimatrix sampling of the Hanjiang River Basin, southeast China.
abstract: Hanjiang River, the second largest river in Guangdong Province, Southern China, is the primary source of drinking water for the cities of Chaozhou and Shantou. Our previous studies indicated that soils from an upstream catchment area of the Hanjiang River are moderately contaminated with organochlorine pesticides (OCPs), which can easily enter the river system via soil runoff. Therefore, OCPs, especially downstream drinking water sources, may pose harmful health and environmental risks. On the basis of this hypothesis, we measured the OCP concentrations in dissolved phase (DP), suspended particle matter (SPM), and surface sediment (SS) samples collected along the Hanjiang River Basin in Fujian and Guangdong provinces. OCP residue levels were quantified through electron capture detector gas chromatography to identify the OCP sources and deposits. The concentration ranges of OCPs in DP, SPM, and SS, respectively, were 2.11-12.04 (ng/L), 6.60-64.77 (ng/g), and 0.60-4.71 (ng/g) for hexachlorocyclohexanes (HCHs), and 2.49-4.77 (ng/L), 6.75-80.19 (ng/g), and 0.89-252.27 (ng/g) for dichloro-diphenyl-trichloroethanes (DDTs). Results revealed that DDTs represent an ecotoxicological risk to the Hanjiang River Basin, as indicated by international sediment guidelines. This study serves as a basis for the future management of OCP concentrations in the Hanjiang River Basin, and exemplifies a pattern of OCP movement (like OCP partition among multimedia) from upstream to downstream. This pattern may be observed in similar rivers in China.
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People's Republic of China; School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors: Jia
authors: J
authors: Liu
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People's Republic of China. Electronic address: shihuaqi@cug.edu.cn.
authors: Shihua
authors: S
authors: Qi
authors: School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
authors: Jun
authors: J
authors: Yao
authors: Faculty of Engineering, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors: Dan
authors: D
authors: Yang
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People's Republic of China.
authors: Xinli
authors: X
authors: Xing
authors: Hubei Key Laboratory of Mine Environmental Pollution Control & Remediation, School of Environmental Science and Engineering, Hubei Polytechnic University, Huangshi 435003, People's Republic of China.
authors: Hongxia
authors: H
authors: Liu
authors: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People's Republic of China; Department of Earth, Environment and Resources Sciences, University of Naples Federico II, 80134 Naples, Italy.
authors: Chengkai
authors: C
authors: Qu
mesh_terms: D002681:China; D002849:Chromatography, Gas; D060766:Drinking Water / Q000032:analysis*; D004784:Environmental Monitoring; D006801:Humans; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D060766:Drinking Water; D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical
keywords: Hanjiang River Basin; Organochlorine pesticide; Partition coefficient; Risk assessment; Sediment–water exchange