利用体外方法评估不同淋洗剂对土壤中砷的淋洗效果及其健康风险  

In vitro assessment of the effectiveness and health risks of using different washing reagents in arsenic removal from soil

作　　者：岳昌盛[1,2] 都慧丽 彭犇 崔岩山[1] YUE Changsheng;DU Huili;PENG Ben;CUI Yanshan(Central Research Institute of Building and Construction,MCC Group Co,Ltd.,Beijing 100088,China;Energy Saving and Environmental Protection,MCC Group Co,Ltd.,Beijing 100088,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]中冶节能环保有限责任公司,北京100088 [3]中国科学院大学资源与环境学院,北京101408 [4]中国科学院生态环境研究中心,北京100085

出　　处：《地学前缘》2019年第6期42-48,共7页Earth Science Frontiers

基　　金：钢铁工业环境保护国家重点实验室开放基金项目(YZC2017Ky01);国家重点研发计划项目(2018YFC1802400)

摘　　要：土壤砷污染已成为我国严重的环境问题,淋洗法是修复土壤砷污染较为有效的手段之一。文中以砷污染土壤为研究对象,运用2种环境友好的淋洗剂KH2PO4和草酸进行振荡淋洗实验,探究两种淋洗剂对不同砷污染土壤的淋洗效果,在此基础上,通过2种不同的体外方法(physiologically based extraction test,PBET;in vitro gastrointestinal,IVG),探索其生物可给性及对人体的健康风险。结果显示,KH2PO4和草酸对土壤中砷有不同程度的去除,草酸对土壤砷的去除率较高,平均去除率为54.3%。运用PBET方法得到的土壤砷的生物可给性高于IVG方法,KH2PO4淋洗后土壤砷的生物可给性高于草酸。与草酸相比,KH2PO4淋洗会在一定程度上增加土壤砷的健康风险。不同in vitro方法对不同淋洗剂修复后效果有不同的评估结果,应该根据不同的淋洗剂选择较为保守的体外方法来评估淋洗后土壤的生物可给性及健康风险。Arsenic(As)pollution in soil has become a serious environmental issue in China.Soil washing is an effective way to remediate soil As pollution.In this paper,we selected three As contaminated soils and two environmentally friendly washing regents(KH2PO4 and oxalic acid)to explore the effectiveness of different washing regents on As contaminated soils.We then conducted two in vitro experiments(by the physiologically based extraction test(PBET)and in vitro gastrointestinal(IVG)methods)to explore soil As bioaccessibility.The results showed that both KH2PO4 and oxalic acid had various soil As removal capacities,and oxalic acid had a higher As removal rate of 54.3%on average.The soil As bioaccessibility determined by PBET was higher than that by the IVG method,and higher after KH2PO4 than oxalic washing.Therefore,compared with oxalic acid,KH2PO4 washing may increase human health risk from As contaminated soil.Our study showed that different in vitro methods can yield different assessments of different washing regents.Therefore,a conservative in vitro method should be selected for each washing regent to evaluate the bioaccessibility of soil As and its associated health risks from washing.

关 键 词：砷土壤 KH2PO4和草酸淋洗 生物可给性 健康风险 

分 类 号：X53[环境科学与工程—环境工程] X592