title: Distribution, speciation, environmental risk, and source identification of heavy metals in surface sediments from the karst aquatic environment of the Lijiang River, Southwest China.
abstract: The distribution and speciation of several heavy metals, i.e., As, Cd, Cr, Cu, Hg, Pb, and Zn, in surface sediments from the karst aquatic environment of the Lijiang River, Southwest China, were studied comparatively. The mean contents of Cd, Cu, Hg, Pb, and Zn were 1.72, 38.07, 0.18, 51.54, and 142.16 mg/kg, respectively, which were about 1.5-6 times higher than their corresponding regional sediment background values. Metal speciation obtained by the optimized BCR protocol highlighted the bioavailable threats of Cd, Cu, and Zn, which were highly associated with the exchangeable fraction (the labile phase). Hierarchical cluster analysis indicated that in sediments, As and Cr were mainly derived from natural and industrial sources, whereas fertilizer application might lead to the elevated level of Cd. Besides, Cu, Hg, Pb, and Zn were related to traffic activities. The effects-based sediment quality guidelines (SQGs) showed that Hg, Pb, and Zn could pose occasional adverse effects on sediment-dwelling organisms. However, based on the potential ecological risk assessment (PER) and risk assessment code (RAC), Cd was the most outstanding pollutant and posed the highest ecological hazard and bioavailable risk among the selected metals. Moreover, the metal partitioning between water and sediments was quantified through the calculation of the pseudo-partitioning coefficient (K P), and result implied that the sediments in this karst aquatic environment cannot be used as stable repositories for the metal pollutants.
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|College of Environmental Science and Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Daoquan
authors.initials: D
authors.lastname: Xu
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China. wyh@gxu.edu.cn.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China. wyh@gxu.edu.cn.
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Ruijie
authors.initials: R
authors.lastname: Zhang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|College of Environmental Science and Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Guo
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|College of Environmental Science and Engineering, Guangxi University, Nanning, 530004, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China. kefuyu@scsio.ac.cn.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China. kefuyu@scsio.ac.cn.
authors.forename: Kefu
authors.initials: K
authors.lastname: Yu
mesh_terms: D002681:China; D004463:Ecology; D004784:Environmental Monitoring / Q000379:methods; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry*; D008628:Mercury / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D018570:Risk Assessment; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Environmental risk; Heavy metal; Karst river; Metal partitioning; Sediment analysis; Source identification
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