污染土壤（人为污染和地质污染）中砷生物可及性的体外评估
In vitro assessment of arsenic bioaccessibility in contaminated (anthropogenic and geogenic) soils.
作者信息
Juhasz Albert L, Smith Euan, Weber John, Rees Matthew, Rofe Allan, Kuchel Tim, Sansom Lloyd, Naidu Ravi
机构信息
Centre for Environmental Risk Assessment and Remediation, Division of Information Technology, Engineering and the Environment, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia.
出版信息
Chemosphere. 2007 Aug;69(1):69-78. doi: 10.1016/j.chemosphere.2007.04.046. Epub 2007 May 29.
Arsenic (As) bioaccessibility in contaminated soils (n=50) was assessed using the simplified bioaccessibility extraction test (SBET). Soils used in the study were collected from sites where As was used as an herbicide (railway corridor) or pesticide (cattle dip sites), from former gold mines and from highly mineralised locations containing geogenic As sources (gossans). In all but three soils, As bioaccessibility was less than 50% indicating that a significant proportion of the total As concentration may not be available for absorption in the gastrointestinal tract following incidental soil ingestion. When regression models were developed based on soil properties, the descriptive variables best able to describe As bioaccessibility in railway corridor, dip site and mine site soils were total As and total or dithionite-citrate extractable (free) iron (Fe). While As bioaccessibility could be predicted (r(2)=0.955, n=50) in these contaminated soils, As bioaccessibility for gossan soils was a poor fit using linear or multivariate regression analysis.
采用简化生物可及性提取试验（SBET）评估了50份受污染土壤中砷（As）的生物可及性。研究中使用的土壤采集自以下地点：将砷用作除草剂的地方（铁路走廊）、用作杀虫剂的地方（牲畜药浴池场地）、 former金矿以及含有地质成因砷源（铁帽）的高矿化地区。除三份土壤外，其他所有土壤中砷的生物可及性均低于50%，这表明在偶然摄入土壤后，胃肠道中可吸收的总砷浓度中只有一大部分不可用。当基于土壤性质建立回归模型时，最能描述铁路走廊、药浴池场地和矿场土壤中砷生物可及性的描述变量是总砷以及总或连二亚硫酸盐-柠檬酸盐可提取（游离）铁（Fe）。虽然在这些受污染土壤中可以预测砷的生物可及性（r² = 0.955，n = 50），但使用线性或多变量回归分析时，铁帽土壤的砷生物可及性拟合效果较差。
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