Distribution, bioavailability, and leachability of heavy metals in soil particle size fractions of urban soils (northeastern China)
Distribution, bioavailability, and leachability of heavy metals in soil particle size fractions of urban soils (northeastern China)
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城市土壤粒径部分重金属的分布、生物有效性和浸出率（中国东北地区）
DOI：
10.1007/s11356-016-6652-y
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发表时间：
2016-04
影响因子：
5.8
通讯作者：
Lu Shenggao
中科院分区：
文献类型：
--
作者：
Zong Yutong;Xiao Qing;Lu Shenggao
本研究探讨了城市土壤中重金属的分布，移动性和潜在的环境风险，在不同粒径的部分。选取辽宁省鞍山市10个代表性城市表层土壤，将其分为6个粒径级，测定其重金属（Cr、Cu、Cd、Pb和Zn）含量。采用毒性特征浸出法（TCLP）和乙二胺四乙酸（EDTA）萃取法分别评价了不同粒径组分中重金属的生物可利用性和可吸附性。结果表明，随着粒径的减小，粒级中镉、铬、铜、铅和锌五种重金属的含量逐渐增加。<2 μm粒级粘粒重金属含量最高，说明城市表层土壤粘粒重金属污染较其他粒级严重。Cr还富集在2000-1000 μm的粗粒级中，表明有成岩作用。而对重金属富集起主导作用的粒径级似乎是50-2 μm的颗粒级。重金属在2000 ~ 1000 μm粒级中的分配系数最低，而在粘粒级中的分配系数最高。土壤粘粒中重金属的富集系数依次为Zn（3.22）> Cu（2.84）> Pb（2.61）> Cr（2.19）> Cd（2.05）。富集因子表明，随着粒径的减小，重金属的富集程度增加，尤其是Cd和Zn。重金属的TCLP-和EDTA-提取的粘土馏分中的浓度相对高于那些在粗颗粒。土壤粘粒中Cd的生物有效性高于其它组分或全土。相比之下，铬表现出类似的生物可接受性在六个大小级的土壤。结果表明，细颗粒物是城市土壤中潜在有毒金属的主要来源。在环境评价中应考虑重金属在不同粒级中的变化。
This study examines the distribution, mobility, and potential environmental risks of heavy metals in various particle size fractions of urban soils. Representative urban topsoils (ten) collected from Anshan, Liaoning (northeastern China), were separated into six particle size fractions and their heavy metal contents (Cr, Cu, Cd, Pb, and Zn) were determined. The bioaccessibility and leachability of heavy metals in particle size fractions were evaluated using the toxicity characteristic leaching procedure (TCLP) and ethylenediaminetetraacetic acid (EDTA) extraction, respectively. The results indicated that the contents of five heavy metals (Cd, Cr, Cu, Pb and Zn) in the size fractions increased with the decrease of particle size. The clay fraction of <2 μm had the highest content of heavy metals, indicating that the clay fraction was polluted by heavy metals more seriously than the other size fractions in urban topsoils. Cr also concentrated in the coarse fraction of 2000–1000 μm, indicating a lithogenic contribution. However, the dominant size fraction responsible for heavy metal accumulation appeared to belong to particle fraction of 50–2 μm. The lowest distribution factors (DFs) of heavy metals were recorded in the 2000- to 1000-μm size fraction, while the highest in the clay fraction. The DFs of heavy metals in the clay fraction followed Zn (3.22) > Cu (2.84) > Pb (2.61) > Cr (2.19) > Cd (2.05). The enrichment factor suggested that the enrichment degree of heavy metal increased with the decrease of the particle size, especially for Cd and Zn. The TCLP- and EDTA-extractable concentrations of heavy metals in the clay fraction were relatively higher than those in coarse particles. Cd bioavailability was higher in the clay fraction than in other fractions or whole soils. In contrast, Cr exhibits similar bioaccessibilities in the six size fractions of soils. The results suggested that fine particles were the main sources of potentially toxic metals in urban soils. The variation of heavy metals in various size fractions should be taken into account in environment assessments.
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影响因子：
6.8
作者：
Gülşen Yıldırım;Ş. Tokalıoğlu
通讯作者：
Gülşen Yıldırım;Ş. Tokalıoğlu
影响因子：
8.8
作者：
Izquierdo, M.;De Miguel, E.;Mingot, J.
通讯作者：
Mingot, J.
DOI：
10.1007/s00254-006-0278-1
发表时间：
2006-04
期刊：
Environmental Geology
影响因子：
--
作者：
Xue-song Wang;Yong Qin;Yong-kang Chen
通讯作者：
Xue-song Wang;Yong Qin;Yong-kang Chen
影响因子：
3.9
作者：
C. Gong;Lingling Ma;Hangxin Cheng;Ying-han Liu;Deru Xu;Bo-Gang Li;Fei Liu;Ya-Ge Ren;Z. Liu-Z
通讯作者：
C. Gong;Lingling Ma;Hangxin Cheng;Ying-han Liu;Deru Xu;Bo-Gang Li;Fei Liu;Ya-Ge Ren;Z. Liu-Z
影响因子：
8.9
作者：
Sutherland, RA
通讯作者：
Sutherland, RA