电子废物拆解区典型用地土壤重金属分布特征

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Abstract

Heavy metal contaminations in soils caused by improper electronic-waste (e-waste) recycling activities have been attracted wide attentions. However, the studies on the enrichment and migration of heavy metals with respect to land uses were scarce. In the study, Longtang, a town located in Qingyuan City, Guangdong Province was selected as the representative region, and soil samples from five land uses, including abandoned e-waste recycling site (ERS), paddy field (PAF), vegetable field (VEF), dry field (DRF), and forest field (FOF) were collected to analyze the distributions of eight heavy metals and their relations with soil physicochemical properties. The results showed that the mean concentrations of heavy metals in soils associated with land uses were generally ranged in the decreasing order as ERS > VEF > PAF > DRF > FOF. In special, concentrations of As, Cd, Cu, Hg, Pb, and Zn in ERS exceeded the maximum allowable concentrations (CEPA, 1995). Cd, Cu, Pb, and Zn were identified as the major pollutants. Additionally, soils from VEF and PAF were also contaminated by Cd and Cu, which were probably originated from ERS via irrigation. While the concentrations of heavy metals in soils from DRF and FOF were comparable with the corresponding background values of Guangdong Province. On the other hand, the concentrations of heavy metals in soils influenced by e-waste recycling activities (e.g., ERS) were significantly decreased against with vertical depth, however, less variation was observed for FOF and DRF. These above-mentioned distribution patterns might be ascribed to the factors including soil pH value, organic matters content, and total phosphorus content. Furthermore, the potential ecological risk of heavy metals ranged from low to serious degree, in special of Cd and Cu. The ecological risk index in soils with respect to land uses ranged from 93 (in FOF) to 4750 (in ERS), with an average value of 1187, which was classified as higher ecological risk. Accordingly, this study provides fundamental data to strongly support the management of e-waste recycling activities and land uses.

Key words： electronic waste land use heavy metal distribution pattern ecological risk

Received: 08 December 2017

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	Articles by authors
	WU Wen-cheng
	SONG Qing-mei
	LIU Xu-cheng
	WU Jia-hui
	CAI Xin-de

Cite this article:

WU Wen-cheng,SONG Qing-mei,LIU Xu-cheng等. Distribution pattern of heavy metals in soils with respect to typical land uses in electronic waste recycling region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2632-2638.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I7/2632

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