样品制备 - - 区分金属和离子金形式以及它们在土壤中的移动性的关键步骤
Joanna Kowalska1, Kamil Bortka1, Monika Sadowska1
1Faculty of Chemistry, University of Warsaw, Ul. Pasteura 1, 02-093, Warsaw, Poland.
Chemosphere
|January 31, 2024
概括
这项研究将离子与土壤中的纳米颗粒 (Pt-NPs) 区分开来,发现这两种形式的移动性都很低,并通过有机复合保留. 用氧化铁丰富土壤可以增强初始吸收.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 区分技术关键元素 (TCE) 的离子和纳米粒子形式,如 (Pt),对于理解它们的环境命运至关重要.
- 评估土壤的吸附能力对于预测金属的流动性和生物可用性至关重要.
- 纳米粒子 (Pt-NPs) 和离子 (Pt II) 在土壤环境中可能表现出不同的行为.
研究的目的:
- 量化确定离子,并间接评估土壤和植物中的纳米粒子 (Pt-NP).
- 在有机土壤中评估离子和Pt-NPs的吸附能力和流动性.
- 为了研究土壤修饰 (Fe2O3丰富,生物碳添加) 对固定化的影响.
主要方法:
- 固体-液体提取与两种测定技术和两种分解方法的交叉比较相结合.
- 用缩的酸 (HNO3) 消化样本,通过阳极剥离电压计 (AdSV) 来确定离子形式.
- 用缩HNO3和缩盐酸 (HCl) 混合物消化后确定总含量.
主要成果:
- 对于离子和纳米粒子形式,实现了高回收率 (99-110%).
- 两种Pt-NP和Pt (II) 显示出低流动性 (<1%),即使在2个月后有酸盐的存在.
- 在有机土壤中的保留与有机复合物的形成有关,在2天内达到平衡. 氧化铁缩暂时增加了吸附,而生物碳对固定不动没有显著影响.
结论:
- 开发了一种强大的方法,用于在土壤中区分和量化离子和Pt-NPs.
- 这两种形式都表现出低流动性和在有机土壤中显著保留,主要是通过复杂化.
- 铁氧化物等土壤修正物可以影响短期吸附,但长期固定机制是复杂的.
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