Department of Inorganic Technology and Environmental Protection, "Politehnica" University of Bucharest, Bucharest, Romania.
Chemosphere. 2013 Jan;90(2):820-6. doi: 10.1016/j.chemosphere.2012.09.091. Epub 2012 Nov 3.
Determination of total concentration of potentially toxic elements (PTEs) in soil is not a reliable tool for evaluating potential exposure risk for humans. PTE lability (EDTA, SBET and solution extraction) and chemical speciation (BCR sequential extraction) were investigated for Pb, Cd, Cu, and Zn, as well as how these could be affected by flooding in soils polluted by smelting activities. The flooding experiment was performed in pots from which soil solution was extracted at different time intervals using Rhizon Moisture Samplers. After experiments, the soil was again subjected to the previous extractions (EDTA, SBET, and BCR) in order to reveal the changes which occurred during anoxia. From the results we can conclude that PTE lability is very high and flooding caused the increase in their mobility up to 100% (for bioaccessible Pb). The experiment demonstrated that temporary reducing conditions can increase the risk of contaminants passing to other environmental compartments and the food chain.
测定土壤中潜在有毒元素（PTE）的总量并不是评估人类潜在暴露风险的可靠工具。本文研究了 EDTA、SBET 和溶液提取法对 Pb、Cd、Cu 和 Zn 的可提取性，以及 BCR 连续提取法对其化学形态的影响，并探讨了这些因素在受冶炼活动污染的土壤中受淹时可能发生的变化。通过在盆中进行淹水实验，使用 Rhizon 水分采样器在不同时间间隔提取土壤溶液。实验结束后，再次对土壤进行之前的提取（EDTA、SBET 和 BCR），以揭示缺氧过程中发生的变化。结果表明，PTE 的可提取性非常高，淹水会导致其移动性增加高达 100%（对生物可利用性 Pb 而言）。该实验表明，临时的还原条件可能会增加污染物转移到其他环境部分和食物链的风险。
