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土壤铁砷形态互作对砷生物可给性和生物有效性的影响：范围综述。

Interconnected soil iron and arsenic speciation effects on arsenic bioaccessibility and bioavailability: a scoping review.

机构信息

Center of Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC, US.

BGC Scientific, Austin, TX, US.

出版信息

J Toxicol Environ Health B Crit Rev. 2022 Jan 2;25(1):1-22. doi: 10.1080/10937404.2021.1996499. Epub 2021 Oct 27.

DOI:10.1080/10937404.2021.1996499
PMID:34706629
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9850428/
Abstract

Extensive research has examined arsenic (As) bioavailability in contaminated soils and is routinely assessed using bioaccessibility (IVBA) assays. Analysis of differences in bioaccessibility measurements across IVBA assays and phases is expected to provide valuable insights into geochemical mechanisms controlling soil As bioaccessibility and bioavailability. Soil iron (Fe) content and As speciation are expected to significantly influence IVBA gastric and intestinal phases due to fluctuations in precipitation-dissolution chemistry and sorption reactivity as pH and assay chemical complexity changes. The aim of this review was to examine these relationships by 1) conducting a meta-analysis (n = 47 soils) determining the influence of total Fe on As bioaccessibility measurements and 5 IVBA assays and 2) investigating the effect of As speciation on gastric/intestinal phase IVBA and correlations. Our findings indicate that soil Fe content and As speciation heterogeneity are important in elucidating variability of bioaccessibility measurements across IVBA assays and gastrointestinal phases. Greater focus on coupled As speciation and Fe precipitation chemistry may (1) improve our understanding of soil geochemical factors and assay constituents that influence As correlations and (2) resolve variability in the precision of oral relative bioavailability (RBA) estimated using IVBA assays for soils possessing heterogenous As speciation and Fe composition.

摘要

大量研究已经考察了污染土壤中的砷（As）生物可利用性，并通常使用生物可及性（IVBA）测定法进行评估。预计对 IVBA 测定法和各阶段生物可及性测量值的差异进行分析，将为控制土壤 As 生物可及性和生物有效性的地球化学机制提供有价值的见解。由于 pH 值和测定化学复杂性的变化引起沉淀-溶解化学和吸附反应性的波动，土壤铁（Fe）含量和 As 形态预计会对 IVBA 胃和肠阶段产生重大影响。本综述的目的是通过 1）进行荟萃分析（n = 47 种土壤）来确定总 Fe 对 As 生物可及性测量值和 5 种 IVBA 测定法的影响，以及 2）研究 As 形态对胃/肠相 IVBA 和相关性的影响，来检验这些关系。我们的研究结果表明，土壤 Fe 含量和 As 形态异质性对于阐明 IVBA 测定法和胃肠道阶段生物可及性测量值的变异性很重要。更注重耦合的 As 形态和 Fe 沉淀化学可能会 1）提高我们对影响 As 相关性的土壤地球化学因素和测定成分的理解，2）解决使用具有异质 As 形态和 Fe 组成的 IVBA 测定法估计口服相对生物有效性（RBA）的精度变异性。

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