Department of Chemistry, University of Girona, C/Maria Aurèlia Capmany 69, 17003 Girona, Spain.
Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain.
J Hazard Mater. 2019 Jun 5;371:316-322. doi: 10.1016/j.jhazmat.2019.03.017. Epub 2019 Mar 5.
In this study, we have evaluated two different ionic liquids (IL) as extractants based on the same cation (trioctylmethylammonium) but bearing the anion thiosalicylate (TOMATS) or salicylate (TOMAS). Both IL have been incorporated as carriers in polymer inclusion membranes (PIMs), and mercury (Hg) has been preconcentrated using a special device. Results show that among the tested IL, TOMATS has given better results. A PIM made of 50% cellulose triacetate, 30% TOMATS and 20% nitrophenyl octyl ether as a plasticizer enabled the effective transport of Hg to a 10M cysteine solution used as a stripping phase. This novel and simple PIM-device system allows the transport of Hg at low concentration levels in different types of natural waters such as rivers, groundwater and seawater without any previous treatment. Since no matrix effect was observed on Hg transport efficiency with different waters, this newly developed PIM-system could be used as a global detection system for this metal. The effect of biofilm growth on the surface of PIMs has been investigated for the first time, and no significant differences on Hg transport have been found when using a fresh PIM and a PIM deployed for 7 days in a pond.
在这项研究中，我们评估了两种不同的离子液体（IL）作为萃取剂，它们基于相同的阳离子（三辛基甲基铵），但带有阴离子硫代水杨酸（TOMATS）或水杨酸（TOMAS）。这两种 IL 都被用作聚合物整体膜（PIM）的载体，汞（Hg）使用特殊装置进行预浓缩。结果表明，在测试的 IL 中，TOMATS 给出了更好的结果。由 50%的三醋酸纤维素、30%的 TOMATS 和 20%的硝基苯辛醚组成的 PIM 作为增塑剂，能够有效地将 Hg 输送到用作洗脱相的 10M 半胱氨酸溶液中。这种新颖简单的 PIM-装置系统允许在无需任何预处理的情况下，在不同类型的天然水中（如河流、地下水和海水）以低浓度水平输送 Hg。由于不同水样对 Hg 传输效率没有基质效应，因此新开发的 PIM 系统可以用作该金属的全球检测系统。首次研究了生物膜生长对 PIM 表面的影响，在池塘中使用新鲜的 PIM 和已使用 7 天的 PIM 时，Hg 的传输没有明显差异。
