title: Metal pollution in Huayuan River in Hunan Province in China by manganese sulphate waste residue.
abstract: The Huayuan River in Hunan Province in China is subject to ongoing mining activity with Mn extraction. In this study, the level and environmental significance of metals (including Mn, Cd, Pb, Cu, Zn, Ni and Fe) concentrations in the surface water and river sediments have been investigated along a 187 km reach of the Huayuan River. Using the X-ray fluorescence (XRF) analysis, we analyzed the characterization of metals in manganese sulphate waste residue (MSWR) deposited along the bank of Huayuan River. The speciation of metals in both sediment and MSWR was established using the BCR-three step sequential extraction procedure. In the water samples, the average concentrations of Mn, Cd and Pb exceeded the acceptable concentrations for drinking water in the WHO Guidelines for drinking water quality, Vol. 1, Recommendations, Geneva (2004) and Chinese (GB 5749-2006) guidelines, respectively. The average concentrations of Mn, Cd, Pb and Zn in the river sediments were found to be considerably higher than the corresponding world average shale values. The percentages of Cd (31.4%), Mn (31.1%), Zn (12.8%) and Pb (8.1%) associated with exchangeable and weak acid fraction in the sediments were higher than other metals. Mn (5.81%), Zn (0.208%), Pb (0.0292%) and Cd (0.0113%) were identified in MSWR by XRF analysis. The percentages of Mn, Cd, Zn and Pb associated with the exchangeable and weak acid soluble fraction in MSWR were 41.9%, 31.1%, 23.8% and 9.8%, respectively. The peak solute and sediment-bound metal concentrations were found at the sites of MSWR deposited along the bank of Huayuan River. The results suggested that MSWR deposited along the bank may have a closely relation with the metal pollution of Huayuan River. The results obtained may be useful to assess both short and long-term environmental impact of the MSWR deposited activities and support decisions for a future remediation of this river.
authors: Key Discipline Laboratory for National Defense for Biology Technology in Uranium Mining and Hydrometallurgy, University of South China, 421001 Hengyang, Hunan, People's Republic of China.
authors: Nan
authors: N
authors: Hu
authors: Ji-Fang
authors: JF
authors: Zheng
authors: De-Xin
authors: DX
authors: Ding
authors: Jun
authors: J
authors: Liu
authors: Lu-Qing
authors: LQ
authors: Yang
authors: Jie
authors: J
authors: Yin
authors: Guang-Yue
authors: GY
authors: Li
authors: Yong-Dong
authors: YD
authors: Wang
authors: Yu-Long
authors: YL
authors: Liu
mesh_terms: D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis*; D045483:Rivers; D014873:Water Pollutants / Q000032:analysis*; D014881:Water Supply / Q000592:standards
chemical_list: D019216:Metals, Heavy; D014873:Water Pollutants