Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel.
Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel.
J Hazard Mater. 2019 Feb 5;363:394-400. doi: 10.1016/j.jhazmat.2018.09.079. Epub 2018 Oct 6.
Transport of indium and gallium is reported in laboratory column experiments using quartz sand as a model porous medium representative of a groundwater system. With increased use of indium and gallium in recent years, mainly in the semiconductor industry, concerns arise regarding their environmental effects. The transport and retention behavior of these two metals were quantified via batch and column experiments, and numerical modeling. The effect of natural organic matter on indium and gallium mobility was studied by addition of humic acid (HA). Measured breakthrough curves from column experiments demonstrated different binding capacities between indium and gallium, stronger for indium, with the presence of HA affecting retention dynamics. For indium, the binding capacity on quartz decreases significantly in the presence of HA, leading to enhanced mobility. In contrast, gallium exhibits slightly higher retention and lower mobility in the presence of HA. In all cases, the binding capacity of gallium to quartz is much weaker than that of indium. These results are consistent with the assumption that indium and gallium form different types of complexes with organic ligands, with gallium complexes appearing more stable than indium complexes. Quantitative modeling confirmed that metal retention is controlled by complex stability.
使用石英砂作为代表地下水系统的模型多孔介质，在实验室柱实验中报告了铟和镓的传输。近年来，由于半导体工业中对铟和镓的需求增加，人们对它们的环境影响产生了担忧。通过批量和柱实验以及数值模拟，量化了这两种金属的迁移和保留行为。通过添加腐殖酸（HA）研究了天然有机物对铟和镓迁移性的影响。柱实验测量的穿透曲线表明，铟和镓之间的结合能力不同，铟的结合能力更强，HA 的存在会影响保留动力学。对于铟，HA 的存在会显著降低其在石英上的结合能力，从而增强其迁移性。相比之下，镓在存在 HA 的情况下表现出更高的保留性和更低的迁移性。在所有情况下，镓与石英的结合能力都远弱于铟。这些结果与铟和镓与有机配体形成不同类型配合物的假设一致，其中镓配合物似乎比铟配合物更稳定。定量模型证实，金属保留受配合物稳定性的控制。
