Occurrence and risk assessment of heavy metals in sediments of the Xiangjiang River, China.
Sediment samples were collected from 22 typical metal-polluted sections along the Xiangjiang River (XJR). Spatial distribution and speciation characteristics of heavy metals in sediments of XJR were determined. Furthermore, ecological risk and enrichment degree of metals were assessed by different indices. The results showed that combined metal pollution occurred in sediments of XJR, with content range of Cd, Pb, Zn, Cu, As, Mn, Cr, and Hg reaching 2.95-29.15, 30.93-235.83, 61.50-3771.11, 9.56-81.81, 3.93-46.28, 774.83-8700.72, 10.64-65.16, and 0.13-5.09 mg kg-1, respectively. Pollution levels increased in period of industrialization but decreased after thousands of pollution enterprises were banned. Sections with serious pollution and higher risk were mainly located at Hengyang and Chang-Zhu-Tan regions (Changsha, Zhuzhou, and Xiangtan) for contaminations of Cd, As, Pb, and Hg. Values of both enrichment factor and geo-accumulation index followed the order Cd > Hg > Zn > Mn > Pb > Cu > As > Cr. Bioavailable fractions followed the order Cd (66.93 %), Zn (33.80 %), Pb (30.81 %), Mn (18.38 %), Hg (17.58 %), Cu (10.20 %), As (9.81 %), and Cr (7.65 %). Considering their bioavailability, biotoxicity, or abundance, contamination of Cd was the most dominant, and pollution of other metals should not be ignored.
College of Environment and Resource, Xiangtan University, Xiangtan, 411105, China.|Hunan Research Academy of Environmental Science, Changsha, 410004, China.
Jinjun
J
Liu
Hunan Research Academy of Environmental Science, Changsha, 410004, China.
Youze
Y
Xu
Hunan Research Academy of Environmental Science, Changsha, 410004, China.
Yingxiang
Y
Cheng
Hunan Research Academy of Environmental Science, Changsha, 410004, China.
Yuanyuan
Y
Zhao
Hunan Research Academy of Environmental Science, Changsha, 410004, China.|College of Resources and Environmental Science, Hunan Normal University, Changsha, 410004, China.
Yanan
Y
Pan
Hunan Research Academy of Environmental Science, Changsha, 410004, China.
Guangyi
G
Fu
College of Environment and Resource, Xiangtan University, Xiangtan, 411105, China. 393756597@qq.com.
Youzhi
Y
Dai
D002681:China; D004463:Ecology; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution; D019015:Geologic Sediments; D008628:Mercury; D019216:Metals, Heavy / Q000032:analysis*; D018570:Risk Assessment; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis*
D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D008628:Mercury
Distribution; Heavy metals; Risk assessment; Sediments; Xiangjiang River