基于稳定同位素与多元素的土壤铅污染源解析

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Abstract Farmlands near electroplating factories and mining areas were selected as the research objects in this study, the single factor index method and Nemero index method were used to evaluate the pollution status of soil heavy metals, and the source of soil Pb was investigated based on the Pb stable isotope and multi element characteristics analysis combined with principal component analysis and cluster analysis. The contribution rate of each pollution source was further quantitatively identified. The results indicated that the farmland soil samples near the electroplating factories and mining areas were seriously polluted by heavy metals, and the lead pollution in both areas reached the severe pollution degree. According to the Pb isotope ratios (²⁰⁷Pb/²⁰⁶Pb、²⁰⁸Pb/²⁰⁶Pb) in samples from different pollution sources and the farmland soil, the contribution rates of each pollution source were calculated by Isosource software. The results showed that the cumulative contribution rates of electroplating waste effluents and solid waste to the Pb pollution in farmland soil nearby was 70.5%, the corresponding contribution rate of ore and tailings piled up in mining area was 71.7%. To further identify the sources of lead pollution in soil, the contents of 28 multi-element in samples from different pollution sources and the farmland soil were studied by principal component analysis and cluster analysis. The results revealed that the multi-element composition of different sources was quite different. The multi-element composition of farmland soil near electroplating factory had the highest similarity with electroplating waste effluents and solid waste, and the multi-element composition of farmland soil near mining areas had the highest similarity with the ore and tailings. Therefore, it could be concluded that the waste effluents and solid waste discharged from the electroplating factory, and ore and tailings piled up in the mining area were the major sources of Pb pollution in farmland soils nearby, respectively. Our analysis also suggested that source apportionment of Pb based on Pb stable isotope ratio and multi-element composition combined with principal component analysis and cluster analysis had the high accuracy and reliability.

Key words： lead stable isotope multi-element source apportionment principal component analysis cluster analysis soil

Received: 29 September 2020

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	XIAO Wen-dan
	YE Xue-zhu
	ZHANG Qi
	ZHAO Shou-ping
	CHEN De
	HUANG Miao-jie
	HU Jing
	GAO Na

Cite this article:

XIAO Wen-dan,YE Xue-zhu,ZHANG Qi等. Source apportionment of lead pollution in soil based on the stable isotope and multi element characteristics[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2319-2328.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I5/2319

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