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Accumulation status, sources and phytoavailability of metals in greenhouse vegetable production systems in Beijing, China

文献类型： 外文期刊

作者： Xu, Li 1 ; Lu, Anxiang 1 ; Wang, Jihua 1 ; Ma, Zhihong 1 ; Pan, Ligang 1 ; Feng, Xiaoyuan 1 ; Luan, Yunxia 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Agr Stand & Testing, Beijing 100097, Peoples R China

2.Beijing Municipal Key Lab Agr Environm Monitoring, Beijing 100097, Peoples R China

3.Beijing Municipal Key Lab Agr Environm Monitoring,

关键词： Transfer factor;Principal component analysis;Cluster analysis;Empirical models;Hazard index

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

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收录情况： SCI

摘要： The accumulation status, sources and phytoavailability of selected metals in greenhouse vegetable production systems in pen-urban areas of Beijing were investigated. The mean concentrations of As, Cd, Cr, Hg and Pb in greenhouse soils were 8.44, 0.25, 69.0, 0.09 and 22.0 mg kg(-1), dw, respectively. According to principal component analysis, As, Cd, Cr and Hg are mainly from anthropogenic source, but Pb is likely from natural source. Metal concentrations in all vegetable samples were decreased in the order of Cr > As > Pb > Cd > Hg. Compared with root and fruit vegetables, leaf vegetables had relatively high concentrations and transfer factors of heavy metals, except for Cd. By including soil pH, OM and greenhouse soil metals, 10 empirical models were derived using stepwise multiple linear regression analysis to predict heavy metal concentrations in the edible parts of different vegetables. Among the different vegetable groups, the highest intakes of metals occurred through consumption of leaf vegetables for the two age groups, except for Cd. The HI value of the studied metals were all below 1, indicating that consumption of vegetables grown in greenhouse soils was of low risk to consumers in our study area. (C) 2015 Elsevier Inc. All rights reserved.

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