控制土壤中的地质分布的过程是由富含铁的沉积岩形成的土壤
Aubry Vandeuren1, Benoît Pereira1, Clélia Van de Casteele1
1Environmental Sciences, Earth and Life Institute, UCLouvain, Croix du Sud 2/L7.05.10, B-1348 Louvain-la-Neuve, Belgium.
Journal of hazardous materials
|December 1, 2024
概括
富含铁的土壤中的 (As) 与母岩有关,但其分布和流动性尚不清楚. 尽管含量很高,但其在奥班日土壤中的低生物可获得性,由于与氧化氧化铁的强度结合,造成的风险很小.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 来自富含铁 (Fe) 沉积岩的土壤可以呈现高 (As) 度.
- 亚斯的地质起源是已知的,但它的土壤配置分布和地表土壤流动性仍然不明确.
- 这限制了对人类和生态系统健康具有潜在危险的As水平的土壤的准确识别.
研究的目的:
- 调查As在由As和Fe丰富的母体材料形成的土壤概况中的分布和协会.
- 评估控制这些土壤中As流动性和生物可访问性的因素.
- 了解在类似的地质背景下对土壤质量评估的影响.
主要方法:
- 分析了来自比利时洛林的奥班格形成的10个土壤样本 (0-85厘米).
- 使用化学分析和扫描电子显微镜进行As分布的详细评估.
- 通过X射线衍射识别矿物相,包括石.
主要成果:
- 始终与来自原材料的富含K,Ca,Al和Si的Fe氧化结合.
- 由于含量在样板和表层土壤 (29-165 mg·kg-1) 之间存在很大差异 (23-753 mg·kg-1),这反映了母材料的异质性.
- 随机运输也影响了亚洲的分布.
- 尽管超出了标准,但由于与Fe氧化水氧化物有很强的关联,在上层土壤中As的生物可访问性很低 (3-6%).
结论:
- 由于与稳定的Fe氧化的强烈关联,在古气候变化过程中形成,限制了其移动性.
- 父母物质异质性和外源性过程显著影响As分布.
- 为了准确的风险评估,土壤质量准则应适应当地的土壤地质条件.
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