研究报告

  • 郭莹莹,张弛,段志鹏,陈璐西,肖小芹,陶澳敏,何云峰.基于形态与in vitro方法的铬污染土壤生物可给性研究[J].环境科学学报,2022,42(10):430-440

  • 基于形态与in vitro方法的铬污染土壤生物可给性研究
  • Bioaccessibility of chromium contaminated soil based on speciation and in vitro methods
  • 基金项目:国家重点研发计划(No.2018YFC1802203)
  • 作者
  • 单位
  • 郭莹莹
  • 浙江大学环境与资源学院,杭州 310058
  • 张弛
  • 浙江大学环境与资源学院,杭州 310058
  • 段志鹏
  • 浙江大学环境与资源学院,杭州 310058
  • 陈璐西
  • 浙江大学环境与资源学院,杭州 310058
  • 肖小芹
  • 浙江大学环境与资源学院,杭州 310058
  • 陶澳敏
  • 浙江大学环境与资源学院,杭州 310058
  • 何云峰
  • 浙江大学环境与资源学院,杭州 310058
  • 摘要:铬(Cr)是电镀类场地的主要污染物.开展土壤中Cr(III)和Cr(VI)的生物可给性研究对于准确评估Cr污染场地风险,克服污染场地过度修复问题十分关键.本研究采集我国栗钙土、红壤、潮土3种典型土壤,通过添加相同浓度污染物的方式制备成Cr(III)或Cr(VI)污染土壤.随后利用5种体外方法(in vitro),对3种土壤经口摄入的Cr生物可给性进行比较与健康风险评估.进而从土壤理化性质、Cr赋存形态、土壤矿物组成方面,对不同土壤在溶解度生物可给性研究联盟(SBRC)方法中的生物可给性差异进行分析.结果表明,基于生物可给性的Cr污染土壤健康风险评估能够显著降低风险水平,提高风险控制值,其中,SBRC方法在评估中更具有保守性.3种土壤在相同的Cr(III)和Cr(VI)污染浓度下,栗钙土相较于红壤和潮土在肠期具有更高的生物可给性和健康风险.此外,土壤黏粒、有机质含量及迁移系数能够影响土壤Cr的生物可给性,土壤矿物种类赋存不同也是造成Cr(III)和Cr(VI)在不同土壤中生物可给性差异的重要因素.
  • Abstract:Chromium(Cr) is the main pollutant in electroplating sites. Investigation on the bioaccessibility of Cr(III) and Cr(VI) in soils is critical to accurately assess the risk of Cr contaminated sites, which can overcome the problem of excessive restoration of contaminated sites. In this study, three typical Chinese soils (chestnut soil, red soil and fluvo-aquic soil) were collected as Cr(III) contaminated soil or by spiking the same concentration contaminant. Afterwards, five in vitro methods were used to compare the bioaccessibility of oral ingestion of Cr in these soils, and health risk assessment was also carried out. Furthermore, using Solubility/Bioaccessibility Research Consortium(SBRC) method, differences in the bioaccessibility of these soils were analyzed from the aspects of soil physicochemical properties, Cr fractionations and mineral compositions. Results showed that, the health risk assessment of Cr in contaminated soil based on bioaccessibility could significantly reduce the risk value and increase the risk control value, and SBRC method was more conservative in evaluation. Under the same Cr(III) and Cr(VI) pollution concentrations of the three soils, chestnut soil had higher bioaccessibility and health risk than red soil and fluvo-aquic soil in intestinal phase. In addition, soil clay, organic matter content and migration coefficient of Cr could influence the bioaccessibility of Cr in soils. different occurrence of Cr minerals species in soils was also an important factor affecting the bioaccessibility of Cr(III) and Cr(VI).

  • 摘要点击次数: 151 全文下载次数: 200