Extension of a biotic ligand model for predicting the toxicity of neodymium to wheat: The effects of pH, Ca2+and Mg2+

文献类型： 外文期刊

第一作者： Li, Shaojing

作者： Li, Shaojing;Wang, Xue Xia;Li, Mengjia;Wang, Fangli;Zong, Haiying;Song, Ningning;Liu, Jun;Wang, Chengming;Wang, Bin;Lv, Zefei

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关键词： Neodymium; Biotic ligand model (BLM); Wheat; Toxicity; Root elongation

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2024 年 271 卷

页码：

收录情况： SCI

摘要： The damage excessive neodymium (Nd) causes to animals and plants should not be underestimated. However, there is little research on the impact of pH and associated ions on the toxicity of Nd. Here, a biotic ligand model (BLM) was expanded to predict the effects of pH and chief anions on the toxic impact of Nd on wheat root elongation in a simulated soil solution. The results suggested that Nd3+ and NdOH2+ were the major ions causing phytotoxicity to wheat roots at pH values of 4.5-7.0. The Nd toxicity decreased as the activities of H+, Ca2+, and Mg2+ increased but not when the activities of K+ and Na+ increased. The results indicated that H+, Ca2+, and Mg2+ competed with Nd for binding sites. An extended BLM was developed to consider the effects of pH, H+, Ca2+, and Mg2+, and the following stability constants were obtained: logKNdBL = 2.51, logKNdOHBL = 3.90, logKHBL = 4.01, logKCaBL = 2.43, and logKMgBL = 2.70. The results demonstrated that the BLM could predict the Nd toxicity well while considering the competition of H+, Ca2+, Mg2+ and the toxic species Nd3+ and NdOH2+ for binding sites.

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