珠江三角洲冲积平原土壤重金属元素含量和来源解析

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Abstract

Forty-four alluvial samples were collected at 22locations in the Pearl River Delta to study the distribution and sources of 8heavy metals with factor analysis, enrichment factor and lead isotopic tracing methods. The study showed that the concentrations of all heavy metals were enriched relative to the background value of soil of China and Guangdong Province. The concentrations of Cr and Ni were similar in top and deep soils, while the concentration of As, Cu, Zn, Cd, Pb in top soils were slightly elevated to deep soils, while the concentration of Hg was significantly enriched in the top soils. Factor analysis indicated that the concentration of Cu, Cr, Ni was mainly controlled by the natural conditions, and the anomalies of As, Pb, Hg were caused by anthropogenic contamination. In some cases, the high concentrations of Cd and Zn were controlled by both geological background and anthropogenic contamination. The results of enrichment factor analysis indicated that the pollution levels of 8heavy metals were Hg > As > Cd > Cu > Pb > Zn > Cr > Ni. The enrichment factor values would be low if the elements were enriched in deep soils. The scatter plot showed there was significantly negative correlation between Pb concentration and ²⁰⁶Pb/²⁰⁷Pb ratio. A binary comprehensive model show that at least 30% Pb in the top soils were derived from anthropogenic contamination. In conclusion, the study found that enhanced levels of Hg, Cd, As, Pb were due to contamination.

Key words： alluvial soil heavy metals enrichment factor lead isotopic tracing factor analysis Pearl River Delta region

Received: 05 February 2018

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	Articles by authors
	HAN Zhi-xuan
	WANG Xue-qiu
	CHI Qing-hua
	ZHANG Bi-min
	LIU Dong-sheng
	WU Hui
	TIAN Mi

Cite this article:

HAN Zhi-xuan,WANG Xue-qiu,CHI Qing-hua等. Occurrence and source identification of heavy metals in the alluvial soils of Pearl River Delta region, south China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3455-3463.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3455

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