Heavy meals in urban roadside soils, part 1: effect of particle size fractions on heavy metals partitioning
Heavy meals in urban roadside soils, part 1: effect of particle size fractions on heavy metals partitioning
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DOI：
10.1007/s00254-006-0278-1
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
Xue-song Wang;Yong Qin;Yong-kang Chen
中科院分区：
文献类型：
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作者：
Xue-song Wang;Yong Qin;Yong-kang Chen
城市道路土壤是评价城市环境重金属浓度的重要环境介质。然而，除其他因素外，重金属浓度受土壤颗粒大小的控制。本研究选取徐州(中国)市区内的两个路旁地块，以反映其土地利用的差异。收集了大量土壤样品，然后按颗粒直径将其分为5个物理尺寸组分，即500-250、250-125、125-74、74-45和45μm。测定了每个组分的金属含量(钛、铬、铝、镓、铅、钡、镉、钴、铜、锰、镍、钒、锌、钼、砷、锑、硒、汞、铋、银)。根据富集系数的大小，这些金属大致可分为两类：人为元素(铅、钡、镉、铜、锌、钼、砷、锑、硒、汞、铋、银)和亲石元素(钛、铬、铝、镓、钴、锰、镍、钒)。正如预期的那样，在最细的粒度分数(即45μm)中观察到较高浓度的人为重金属(铜、锌、钼、砷、汞、铋、银)。然而，重金属Se、Sb和Ba的行为与所选的颗粒大小无关。从质量负荷的角度来看，在1号站位，30%以上的人为重金属浓度是由45-74μm粒级贡献的，在2号站位，超过70%的重金属浓度是由45-74和74-125mμm粒级粒级浓度贡献的。这些结果对于土壤结合重金属的迁移和各种补救措施的污染控制具有重要意义。
Urban roadside soils are important environmental media for assessing heavy metal concentrations in urban environment. However, among other things, heavy metal concentrations are controlled by soil particle grain size fractions. In this study, two roadside sites were chosen within the city of Xuzhou (China) to reflect differences in land use. Bulk soil samples were collected and then divided by particle diameter into five physical size fractions, 500–250, 250–125, 125–74, 74–45, < 45 μm. Concentrations of metals (Ti, Cr, Al, Ga, Pb, Ba, Cd, Co, Cu, Mn, Ni, V, Zn, Mo, As, Sb, Se, Hg, Bi, Ag) were determined for each individual fraction. These metals could be roughly classified into two groups: anthropogenic element (Pb, Ba, Cd, Cu, Zn, Mo, As, Sb, Se, Hg, Bi, Ag) and lithophile element (Ti, Cr, Al, Ga, Co, Mn, Ni, V) in terms of values of enrichment factor. As expected, higher concentrations of anthropogenic heavy metals (Cu, Zn, Mo, As, Hg, Bi, Ag) are observed in the finest particle grain size fraction (i.e. < 45 μm). However, heavy metals Se, Sb and Ba behave independently of selected grain size fractions. From the viewpoint of mass loading, more than 30% of the concentrations for all anthropogenic heavy metals are contributed by the particle grain size fractions of 45–74 μm at site 1 and more than 70% of the concentrations for all heavy metals are contributed by the particle grain size fractions of 45–74 and 74–125 μm at site 2. These results are important for transport of soil-bound heavy metals and pollution control by various remedial options.