苏南典型工农业交错区土壤铅富集特征及源解析——基于PCA-PMF方法

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Abstract On the basis of chemical sequential extraction, statistics, principal component analysis (PCA) and positive matrix factorization (PMF), we identified the characteristics of Pb distribution, pollution and sources in cropland soils of Renyang district of Changshu city, a typical industry-based peri-urban area in China. Pb presented significantly enrichment in the topsoil, and the mean concentration of topsoil Pb exceeded approximately one time of the local background value. The exogenous Pb in the topsoil was mainly bound to Fe/Mn oxides and residual fractions. Compared to the topsoil, the deeper soils presented the higher proportions of Pb bound to carbonates and residual Pb, but the lower proportions of Pb bound to Fe/Mn oxides and Pb bound to humus acid, respectively. PCA and PMF revealed four primary factors with the following contribution rates to Pb in the soil: natural geologic process (42.8%), exhaust from vehicle (leaded petrol) and combustion of fossil fuel which were delivered by atmospheric deposition (15.5%), industrial emissions involved the nonferrous metals such as electroplating (21.6%), and other mixed sources in the terrestrial geochemical process (20.1%). The results of the PCA and PMF methods used for source apportionment of Pb were in good agreement.

Key words： heavy metals Yangtze River Delta pollution source soil profile sequential extraction

Received: 28 June 2020

PACS:	X53
	S15

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	WANG Cheng
	ZHAO Yan-ping
	XIE Ming-jie

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WANG Cheng,ZHAO Yan-ping,XIE Ming-jie. Characteristics of lead enrichment in the soil from a typical peri-urban agricultural area of the southern Jiangsu and source appointment based on the PCA-PMF method[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 279-287.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/279

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