Spatial distribution of heavy metal concentrations in urban, suburban and agricultural soils in a Mediterranean city of Algeria
Spatial distribution of heavy metal concentrations in urban, suburban and agricultural soils in a Mediterranean city of Algeria
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DOI：
10.1016/j.envpol.2010.02.001
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发表时间：
2010-06-01
影响因子：
8.9
通讯作者：
Giraudoux, P.
中科院分区：
文献类型：
--
作者：
Maas, S.;Scheifler, R.;Giraudoux, P.
作为一个旨在评估金属在食物网中的迁移和影响的大型项目的一部分，这项工作研究了阿尔及利亚第四大人口城市安纳巴周边大片区域内101个次表层土壤中镉（Cd）、铬（Cr）、铜（Cu）、铅（Pb）和锌（Zn）的空间分布，这些土壤是按（1×1千米规则网格）系统采样的。镉和铬仅出现一个异常高值，其他所有浓度都接近土壤地质背景值。城市中心的一些地方受到铅污染（高达823毫克/千克），可能是由于汽油尾气的大气沉降。在整个采样区域内，锌从未超过规定限值。铜是唯一出现空间自相关的元素。通过协同克里金法进行空间插值，确定农业活动是铜污染的主要来源。我们的方法揭示了各种人为污染源，对于大规模污染模式的揭示比对于局部异常情况更为有效。2010爱思唯尔有限公司。保留所有权利。
As part of a larger program aiming at assessing transfer and effects of metals in food webs, this work studied the spatial distribution of Cd, Cr, Cu, Pb, and Zn in 101 sub-surface soils, systematically sampled (1 x 1 km regular grid) over a large area around Annaba, the fourth most-populated city of Algeria. Cd and Cr exhibited only one abnormally high value, with all other concentrations being close to pedo-geological background. Some places in the centre of the city were polluted by Pb (up to 823 mg kg(-1)), probably due to aerial deposition from gasoline exhausts. Zn never exceeded regulatory limits over the whole sampling area. Cu was the only element for which a spatial autocorrelation occurred. A spatial interpolation by cokriging allowed the identification of agricultural activities as the main Cu pollution source. Our approach revealed various anthropogenic pollution sources, more efficiently for large-scale patterns than for local abnormalities. (C) 2010 Elsevier Ltd. All rights reserved.