Historical records, distribution characteristics and sources of heavy metals from sediment core in Honghu Lake, China
ZHENG Huang1, YANG Dan2, XING Xin-li1,3, ZHANG Ze-zhou3, SHU Quan-lai1
1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;
2. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
3. State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences, Wuhan 430074, China
In order to understand the historical level of heavy metals concentrations of Honghu Lake, a sediment core was collected in December 2014. The concentrations of 4 heavy metals (Cu, Cd, Zn, Pb) were determined and the chronology was dated by 137Cs and 210Pb. The total concentrations of 4heavy metals ranged from 67.86mg/kg to 189.57mg/kg and the concentrations of individual heavy metals ranked as Pb>Zn>Cu>Cd. The geoaccumulation index indicated that the concentrations of Cu and Zn were uncontaminated, while level of Pb was uncontaminated to moderately contaminated and Cd was moderately contaminated to strongly contaminated. The concentrations of heavy metals in sediments were affected by the flood events and reclamations. Before the construction of Xintan sluice, the tendency of heavy metal concentrations caused by floods decreased at first, then increased. However, the concentrations increased due to the waterlogging caused by floods after the sluice's built. Reclamations contributed to increasing of heavy metals concentrations in sediments. Source diagnosis results suggested that heavy metals in sediment were from non-point agriculture source, transportation activities and industrial and domestic wastewater.
郑煌, 杨丹, 邢新丽, 张泽洲, 舒全来. 洪湖沉积柱中重金属的历史分布特征及来源[J]. 中国环境科学, 2016, 36(7): 2139-2145.
ZHENG Huang, YANG Dan, XING Xin-li, ZHANG Ze-zhou, SHU Quan-lai. Historical records, distribution characteristics and sources of heavy metals from sediment core in Honghu Lake, China. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(7): 2139-2145.
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