摘要
采集我国红壤、棕壤、褐土和黑土等4种典型土壤,制备成镉含量为180 mg·kg^(-1)的人工污染土,基于in vitro试验方法分析土壤镉在人体消化道不同阶段的生物可给性并评估健康风险,之后结合对土壤基本理化特性和镉赋存形态的全面测定,阐释镉的生物可给性的影响因素以及土壤间差异的原因.结果表明,镉在胃阶段的生物可给性(94.36%—96.54%)显著高于小肠阶段(50.46%—80.07%);各土壤镉经口部摄入的致癌风险均超过可接受限值2个数量级,而非致癌风险未超限.此外,土壤镉的生物可给性与氯化钙提取态镉含量、迁移系数以及土壤有机质含量存在相关性,而影响土壤镉在胃阶段生物可给性的主导因子为迁移系数,小肠阶段则为土壤有机质含量.本研究体现了in vitro试验方法的优越性,其成果将为大规模污染土壤风险评估工作的精准化做出积极贡献.
In this study, four typical Chinese soils(i.e., red soil, brown soil, cinnamon soil and black soil) were artificially contaminated with a Cd concentration of 180 mg·kg^(-1). The bioaccessibility of soil Cd was then studied using in vitro test, and the relevant health risk was assessed. Besides, the influencing factors on Cd bioaccessibility, together with the causes for differences between soils,were investigated from the aspects of physicochemical properties and Cd fractionation of the soils.Results showed that the bioaccessibility of Cd in the gastric phase(94.36% —96.54%) was significantly higher than that in the small intestinal phase(50.46%—80.07%). The carcinogenic risk of Cd in all soils was two orders of magnitude higher than the acceptable limit, while the noncarcinogenic risk did not exceed it. In addition, the bioaccessibility of soil Cd was found closely correlated with the content of CaCl2 extractable-Cd, the mobility factor and the content of soil organic matter. The latter two were determined to be the dominant factors of soil Cd bioaccessibility in the gastric phase and the small intestinal phase, respectively. The superiority of in vitro test was showed in this study, and the results make contributions to the accurate health risk assessment of contaminated soils in large scale.
作者
陈晓晨
黄艺佳
赵桐
陈冠霖
王俊杰
袁梓芮
张剑宇
尹乃毅
刁国旺
徐开钦
CHEN Xiaochen;HUANG Yijia;ZHAO Tong;CHEN Guanlin;WANG Junjie;YUANZirui;ZHANG Jianyu;YIN Naiyi;DIAO Guowang;XU Kaiqin(Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology,College of Environment and Safety Engineering,Fuzhou University,Fuzhou,350108,China;Key Laboratory of Groundwater Resources and Environment(Ministry of Education),Jilin University,Changchun,130021,China;Jiangsu Longchang Chemical Co.,Ltd.,Rugao,226532,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing,101408,China;School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,225002,China;Center for Material Cycles and Waste Management Research,National Institute for Environmental Studies,Tsukuba,305–8506,Japan)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第10期3015-3023,共9页
Environmental Chemistry
基金
国家自然科学基金(41807116)
福建省自然科学基金(2019J05035)
江苏省博士后科研资助计划项目(A类)(2020Z025)
福建省级大学生创新创业训练计划项目(S202010386067)资助。
