ATC Building, Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), University of Newcastle, Callaghan, NSW, 2308, Australia.
ATC Building, Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), University of Newcastle, Callaghan, NSW, 2308, Australia; School of Space and Environment, Beihang University, Beijing, China.
Environ Pollut. 2019 Mar;246:53-59. doi: 10.1016/j.envpol.2018.11.104. Epub 2018 Nov 30.
Lead (Pb) contaminated soil is of particular concern for infants and children due to their susceptibility to exposure, fast metabolic rates and rapidly developing neuronal systems. Determining the bioaccessibility of Pb in soils is critical in human health risk assessments, which can vary due to different soil properties and sources of Pb contamination. In this study, the potential relationships between soil properties and Pb bioaccessibility from various Pb sources including Pb contamination from mining (specifically, Broken Hill), three shooting ranges, a smelter and two industry sites (pottery and battery), were investigated using the Relative Bioavailability Leaching Procedure (RBALP). We found the following: (1) CEC, TOC, sand and silt content, and total Pb were significantly different (p < 0.05) between the two particle size fractions of < 2 mm and < 250 μm; (2) EC, CEC and total Pb were significantly correlated to Pb bioaccessibility (p < 0.05); and (3) soil analyses based on source of Pb demonstrated a strongly significant relationship between Pb bioaccessibility and soil properties (CEC, EC, clay content and total Pb) for mining soils from Broken Hill (r = 0.86, p < 0.05, n = 18). These results demonstrated the influences of Pb contamination sources, soil properties and particle size fractions on Pb bioaccessibility as well as the prediction of Pb bioaccessibility using soil properties. The findings documented here will help in developing a predictive tool for human health risk assessment and the remediation of Pb contaminated soils.
铅（Pb）污染土壤尤其值得关注，因为婴儿和儿童易受到暴露，新陈代谢率高，神经元系统发育迅速。确定土壤中 Pb 的生物可给性对于人类健康风险评估至关重要，而生物可给性会因不同的土壤特性和 Pb 污染来源而有所差异。在这项研究中，使用相对生物有效性浸出程序（RBALP）研究了来自不同 Pb 污染源（包括采矿污染（具体为 Broken Hill）、三个射击场、一家冶炼厂和两家工业场地（陶器和电池））的土壤特性与 Pb 生物可给性之间的潜在关系。我们发现：（1）CEC、TOC、砂和粉土含量以及总 Pb 在<2mm 和<250μm 的两个粒径分数之间存在显著差异（p<0.05）；（2）EC、CEC 和总 Pb 与 Pb 生物可给性显著相关（p<0.05）；（3）基于 Pb 来源的土壤分析表明，Broken Hill 采矿土壤的 Pb 生物可给性与土壤特性（CEC、EC、粘土含量和总 Pb）之间存在强烈的显著关系（r=0.86，p<0.05，n=18）。这些结果表明，Pb 污染来源、土壤特性和粒径分数会影响 Pb 的生物可给性，以及利用土壤特性预测 Pb 的生物可给性。本文的研究结果将有助于开发用于人类健康风险评估和 Pb 污染土壤修复的预测工具。
