A semi-mechanistic aging model of Pb added to soil by a modified stable isotope dilution technique

文献类型： 外文期刊

第一作者： Ji, Xuezhi

作者： Ji, Xuezhi;Li, Jumei;Sun, Shuo;Ma, Yibing;Ma, Yibing;Zhong, Ying

作者机构：

关键词： Lead; Stable isotope dilution; E-value; Aging model; Soil

期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.8； 五年影响因子：4.3 ）

ISSN： 2045-2322

年卷期： 2024 年 14 卷 1 期

页码：

收录情况： SCI

摘要： The aging of Pb added to soils has not been studied by the isotopic technology because of difficulties in determination of isotopically exchangeable Pb in soil, so that a set of 10 typical agricultural soils in China and a one-year aging experiment with the addition of water-soluble Pb to the soils were carried out. A modified stable isotope dilution technique to determine isotopically exchangeable Pb in soil was developed where 0.2 mM EDTA (ethylenediaminetetraacetic acid) as the extractant. When water-soluble Pb was added to soil, the isotopically exchangeable Pb (E-add%, the percentage of isotopically exchangeable Pb to total Pb added to soil) initially decreased rapidly and gradually slowly. A semi-mechanistic aging model of Pb added to soils, including precipitation/nucleation (Y-1), micropore diffusion (Y-2), and organic matter encapsulation processes (Y-3) was developed with the root mean square error 8.3% where Y-1, Y-2, and Y-3 accounted for 0.02 similar to 26.9%, 1.4 similar to 21.8% and 3.8 similar to 11.3%, respectively, when the pH 4.0 similar to 8.0 and organic matter 2.0 similar to 6.0%. Soil pH was a vital factor affecting the aging rate. When the pH increased by 1 unit, the E-add value decreased by approximately 9%. The model could be used to scale ecotoxicological data of Pb in soil generated in different aging times.

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