title: Spatial and temporal variation of heavy metal risk and source in sediments of Dongting Lake wetland, mid-south China.
abstract: Surface sediments of Dongting Lake wetland were collected from ten sites to investigate variation trend, risk and sources of heavy metal distribution in dry seasons of 2011∼2013. The three-year mean concentrations (mg/kg) of Cr, Cu, Pb, Cd, Hg and As were 91.33, 36.27, 54.82, 4.39, 0.19 and 25.67, respectively, which were all higher than the corresponding background values. Sediment quality guidelines (SQGs) and Geo-accumulation index (Igeo) were used for the assessment of pollution level of heavy metals. The pollution risk of Cd, Hg and As were great and that of Cr needed urgent attention because of its obvious increase. Pollution load index (PLI) and geographic information system (GIS) methods were conducted to assess spatial and temporal variation of heavy metal contamination. Results confirmed an increased contamination contribution inflow from Xiang River. Multivariate statistical analyses were applied to identify contribution sources of heavy metal, which showed anthropogenic origin mainly from mining, smelting, chemical industry and agricultural activity.
authors.affiliation: a College of Environmental Science and Engineering , Hunan University , Changsha , P.R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liang
authors.forename: Jiayu
authors.initials: J
authors.lastname: Liu
authors.forename: Xingzhong
authors.initials: X
authors.lastname: Yuan
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.forename: Xu
authors.initials: X
authors.lastname: Lai
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
authors.forename: Haipeng
authors.initials: H
authors.lastname: Wu
authors.forename: Yujie
authors.initials: Y
authors.lastname: Yuan
authors.forename: Fei
authors.initials: F
authors.lastname: Li
mesh_terms: D000383:Agriculture; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis*; D015999:Multivariate Analysis; D018570:Risk Assessment; D045483:Rivers / Q000737:chemistry; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical
keywords: Heavy metal; risk; sediment; source apportionment; spatial and temporal variation