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Sorption mechanism of cadmium on soils: A combination of batch experiment, path analysis, and EXAFS techniques
Geoderma ( IF 6.1 ) Pub Date : 2022-05-25 , DOI: 10.1016/j.geoderma.2022.115950
Ting-Ting Fan, Qian Sun, Pei-Xin Cui, Liang Xuan, Yu-Jun Wang

Soil cadmium (Cd) contamination has emerged as an alarming environmental issue worldwide. Chemical reactivity and bioavailability of Cd in soils are highly dependent on soil properties. However, the sorption mechanism of Cd(II) on soils is not yet fully explored. For this purpose, batch sorption experiments, statistical analysis, and extended X-ray absorption fine structure (EXAFS) spectroscopy were integrated to elucidate the Cd(II) sorption mechanism by investigating the Cd(II) sorption behaviors in 49 soils with contrasting physicochemical characteristics and to figure out the influence of soil properties on Cd(II) sorption in soils. The outcomes of this study revealed that the soils from different areas had large differences in their abilities to adsorb Cd(II), while the differences were closely related to the physicochemical properties of soils. Cd(II) sorption capacities were controlled together by pH, metal (hydro)oxides, organic matter, and cation exchange capacity. The soil pH was the most critical factor in connecting Qmax with soil properties. EXAFS results indicated that Cd(II) adsorbed on soils was mainly bound with metal (hydro)oxides or existed as CdCO3 precipitate. The findings of this study provide a theoretical basis for predicting the risk of soil Cd contamination.



中文翻译:

土壤对镉的吸附机制:批量实验、路径分析和 EXAFS 技术的结合

土壤镉 (Cd) 污染已成为世界范围内令人担忧的环境问题。土壤中 Cd 的化学反应性和生物有效性高度依赖于土壤性质。然而,Cd(II) 在土壤上的吸附机制尚未完全探索。为此,将批量吸附实验、统计分析和扩展 X 射线吸收精细结构 (EXAFS) 光谱结合起来,通过研究 49 种具有对比物理化学特性的土壤中的 Cd(II) 吸附行为来阐明 Cd(II) 吸附机制并确定土壤性质对土壤中 Cd(II) 吸附的影响。本研究结果表明,不同地区的土壤对 Cd(II) 的吸附能力存在较大差异,而这些差异与土壤的理化性质密切相关。Cd(II) 吸附容量由 pH、金属(氢)氧化物、有机物和阳离子交换容量共同控制。土壤 pH 值是连接的最关键因素Q max与土壤特性。EXAFS结果表明吸附在土壤上的Cd(II)主要与金属(氢)氧化物结合或以CdCO 3沉淀物的形式存在。本研究结果为预测土壤镉污染风险提供了理论依据。

更新日期:2022-05-25
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