砷在澳大利亚新南威尔士州选定矿区废弃土壤中的生物可给性和形态分析及人体健康风险评估。
Arsenic bioaccessibility and fractionation in abandoned mine soils from selected sites in New South Wales, Australia and human health risk assessment.
机构信息
Global Centre for Environmental Remediation (GCER), College of Engineering, Science and Environment, The University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC-CARE), The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia; Department of Soil Science, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh.
Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria, 3000, Australia.
出版信息
Ecotoxicol Environ Saf. 2021 Oct 15;223:112611. doi: 10.1016/j.ecoenv.2021.112611. Epub 2021 Aug 9.
Understanding the transport behaviour of arsenic (As) from soils to humans is critical when undertaking human health risk assessment and contamination control. This research examined As bioaccessibility in different As fractions and particle size fractions of As-enriched mine soils using different extractions. Bioaccessibility of As ranged from 0.24% to 32% for Solubility Bioaccessibility Research Consortium (SBRC) and Physiologically Based Extraction Test (PBET) methods, with extractable As (using 0.43 M HNO) being 1.3-24.9%. The highest As bioaccessibility (19-32%) was consistently observed in the fine particle size fraction (< 53 µm) of all three extractions. Sequential extractions revealed that As fractions were mostly associated with crystalline (30-73%) and amorphous (9-59%) Fe/Al oxyhydroxides. The bioaccessibility of As in the gastric phase of SBRC and PBET methods highlighted a positive correlation (R = 0.83-0.88, p < 0.01) with exchangeable, surface and amorphous- bound As fractions, while the intestinal phase showed a strong positive correlation (R = 0.85-0.89, p < 0.01) with exchangeable and surface bound fractions. The study revealed that As bioaccessibility in soils can potentially be determined using the 0.43 M HNO extraction procedure. Health risk assessment confirmed that there was a strong increase in chronic daily intake, hazard quotient and cancer risk, with a reduction in particle size.
了解砷（As）从土壤到人体的迁移行为对于进行人体健康风险评估和污染控制至关重要。本研究使用不同的提取方法，考察了富砷矿区土壤中不同 As 形态和颗粒大小分级的 As 生物可给性。使用溶解度生物可给性研究协会（SBRC）和基于生理学的提取测试（PBET）方法，As 的生物可给性范围为 0.24%至 32%，可提取的 As（使用 0.43 M HNO3）为 1.3-24.9%。所有三种提取方法中，最细颗粒分级（<53 μm）的 As 生物可给性（19-32%）始终最高。连续提取表明，As 形态主要与结晶态（30-73%）和非晶态（9-59%）Fe/Al 水合氧化物有关。SBRC 和 PBET 方法中 As 的生物可给性与可交换、表面和非晶态结合的 As 形态呈正相关（R = 0.83-0.88，p < 0.01），而肠相则与可交换和表面结合的形态呈强正相关（R = 0.85-0.89，p < 0.01）。该研究表明，可使用 0.43 M HNO3 提取程序来确定土壤中 As 的生物可给性。健康风险评估证实，随着粒径的减小，慢性日摄入量、危害系数和癌症风险都有显著增加。
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