College of Environmental and Safety Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, China.
Liaoning Engineering Research Center for Treatment and Recycling of Industrially Discharged Heavy Metals, Shenyang University of Chemical Technology, Shenyang, 110142, Liaoning, China.
Environ Sci Pollut Res Int. 2021 Sep;28(33):45199-45211. doi: 10.1007/s11356-021-13874-x. Epub 2021 Apr 16.
The trace element of As and Sb have resulted in serious threats to ecological sustainability and human health in the Xijiang River basin, China. The geoaccumulation index (I) results showed the sediment of Xijiang River was heavily contaminated by Sb as well as moderately contaminated by As. The effect of inorganic anions on the released As and Sb from the sediment increases in the following sequence: Cl < SO < CO < PO. The presence of PO and CO had the greater effect over As mobility from the sediment compared to Sb. The effect of Ca(II), Al(III), and Mg(II) on the released amount of Sb from the sediment is negligible. Meanwhile, in the case of As, Ca(II) and Mg(II) had small impacts, but the released amount of As increased slightly with an increase of Al(III) concentration. The stability of As and Sb in the sediment was found to be the best at pH 5. The effect of organic compounds (≤ 0.05 mol/L) on the dissolved As percentages from the sediment increased in the following sequence: ethylenediaminetetraacetate (EDTA) < oxalate < citrate, and the effect on Sb release was oxalate < EDTA < citrate at concentrations (≤ 0.025 mol/L). This study provides the basic theoretical basis to manage the mobilization of co-contamination of sediments with As and Sb under the influence of external perturbations.
在中国西江流域，砷（As）和锑（Sb）微量元素对生态可持续性和人类健康造成了严重威胁。地球化学积累指数（I）的结果表明，西江流域的沉积物受到 Sb 的严重污染，以及受到 As 的中度污染。无机阴离子对从沉积物中释放的 As 和 Sb 的影响按以下顺序增加：Cl < SO < CO < PO。PO 和 CO 的存在对 As 从沉积物中的迁移性的影响大于 Sb。Ca(II)、Al(III)和 Mg(II)对 Sb 从沉积物中释放量的影响可以忽略不计。同时，对于 As，Ca(II)和 Mg(II)的影响较小，但随着 Al(III)浓度的增加，As 的释放量略有增加。在 pH 5 时，沉积物中 As 和 Sb 的稳定性被认为是最佳的。在浓度（≤ 0.025 mol/L）下，有机化合物（≤ 0.05 mol/L）对从沉积物中溶解的 As 百分比的影响按以下顺序增加：乙二胺四乙酸（EDTA）<草酸盐<柠檬酸盐，对 Sb 释放的影响是草酸盐<EDTA<柠檬酸盐。本研究为在外部干扰影响下管理沉积物中 As 和 Sb 的共污染的迁移提供了基本的理论基础。
