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微量元素的生物可访问性和可用性与替代铁氧化物共同沉

Daniel Kroehling¹, Renato Welmer Veloso², Jaime Wilson Vargas de Mello¹

¹Soils Department, Universidade Federal de Viçosa (UFV), Peter Henry Rolfs Avenue, Viçosa, MG, Brazil.

Environmental geochemistry and health

|June 26, 2025

概括

土壤中的铁氧化物强烈地结合,和,但不那么强烈地结合,和. 替代增强了和的稳定性,对的生物可访问性构成健康风险.

科学领域:

环境科学环境科学
地质化学地质化学
土壤科学土壤科学

背景情况:

铁氧化物纳米颗粒是土壤和沉积物中微量元素的关键储库.
微量元素可以通过表面复合或固体相合并被氧化铁隔离.
了解氧化铁中微量元素的行为对于环境风险评估至关重要.

研究的目的:

为了评估与氧化铁共降的微量元素的吸附稳定性和生物可访问性.
评估 (Al) 替代和 (Hg) 存在对微量元素环境流动性的影响.
为了研究微量元素度对吸附稳定性的影响.

主要方法:

铁氧化物与 (As), (Pb), (Sb), (Cd), (La), (Yb) 和 (Hg) 在 (Al) 存在或不存在的情况下沉.
使用顺序提取程序 (BCR和SBET) 评估吸附稳定性.
通过口服摄入生物可访问性分析进行人类风险评估.

主要成果:

,和的提取百分比较低 (<10%),表明铁氧化物对的保留很强.
兰,和的提取百分比更高 (高达86%),表明吸附能力较弱,并有限的合并.
和的吸附稳定性在较高度下降. 与Al-goethite共同降落的和比与Lepidocrocite或Al-free-goethite相比更稳定.
在所有样本中,高生物可访问含量对儿童 (HQ>1) 构成健康风险.

结论:

铁氧化物对微量元素具有选择性吸附,对As,Cd和Sb具有强烈的保留,对La,Pb和Yb则较弱.
的替代影响了微量元素的稳定性,通过Al-goethite增强了As和Cd的稳定性.
氧化铁中的生物可获得性对人类健康构成重大风险,特别是对儿童来说.

关键词:

,,等物质的使用.哥斯提人哥斯提人是一个哥斯提人.危害健康的风险健康风险稀土元素稀土元素是一种稀土元素.

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