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Mineral-organic interactions drive the aging and stabilization of exogenous Pb in soils

文献类型： 外文期刊

作者： Hu, Xiping 1 ; Qu, Chenchen 1 ; Shi, Hanzhi 4 ; Cai, Peng 1 ; Chen, Wenli 1 ; Huang, Qiaoyun 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Resources & Environm, Natl Key Lab Agr Microbiol, Wuhan 430070, Peoples R China

2.Huazhong Agr Univ, Hubei Key Lab Soil Environm & Pollut Remediat, Wuhan 430070, Peoples R China

3.State Environm Protect Key Lab Soil Hlth & Green R, Wuhan 430070, Peoples R China

4.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China

关键词： Interfacial reaction; Heavy metal contamination; Pb Modeling; Soil organic matter; Metal oxides

期刊名称：GEODERMA （ 影响因子：6.1； 五年影响因子：7.0 ）

ISSN： 0016-7061

年卷期： 2023 年 437 卷

页码：

收录情况： SCI

摘要： The interactions of soil components have profound impacts on the speciation, bioavailability and transformation of heavy metals. However, these interactions have not been well included in multi-surface model (MSM) as most of the models adopt component additive method. Here, an incubation experiment was conducted with three contrasting soils spiked with 200 mg/kg Pb and rice straw to investigate the impact of mineral-organic in-teractions on Pb speciation and to validate the MSM for Pb in soils. With the aid of chemical extraction and instrumental analysis (XANES and SEM-EDS), the results show that metal oxides and soil organic matter are the main scavengers for Pb, accounting for the stabilization of exogenous Pb by -40% -80% and -13% -30%, respectively. The accumulation of the most stable residual Pb was driven by Fe/Al oxides, which was fostered by organic matter through the formation of amorphous Fe/Al oxides. Unexpectedly, the introduction of straw promoted the activation of metal oxides and the competition from Fe/Al/Ca ions reduced the binding of Pb by soil organic matter. Simulation of organic-Fe/Al/Ca interactions largely improved the accuracy of the MSM model results for the prediction of Pb speciation distribution. Overall, this study highlights that mineral-organic interactions play important role in the stabilization of exogenous Pb in soils, while incorporate of these in-teractions into MSM is recommended in future heavy metal studies.

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