洪湖沉积柱中重金属的历史分布特征及来源

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Abstract

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.

Key words： Honghu Lake sediments core heavy metal chorology pollution history source analysis

Received: 02 December 2015

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	Articles by authors
	ZHENG Huang
	YANG Dan
	XING Xin-li
	ZHANG Ze-zhou
	SHU Quan-lai

Cite this article:

ZHENG Huang,YANG Dan,XING Xin-li等. Historical records, distribution characteristics and sources of heavy metals from sediment core in Honghu Lake, China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(7): 2139-2145.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I7/2139

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