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.
Anal Chem. 2018 Apr 3;90(7):4756-4763. doi: 10.1021/acs.analchem.7b05430. Epub 2018 Mar 14.
A novel and simple method is presented for the preconcentration and determination of mercury (Hg) from natural waters through its extraction into a polymer inclusion membrane (PIM) containing the task-specific ionic liquid trioctylmethylammonium thiosalicylate (TOMATS) followed by Energy Dispersive X-ray fluorescence (EDXRF) analysis. The determination was made directly on the membrane without any treatment or elution step, and due to the characteristics of the PIM no matrix or thickness corrections were required in EDXRF analysis. Under the best extracting and EDXRF operating conditions, a Hg limit of detection of 0.2 μg Hg L was obtained. Moreover, no water matrix effect was observed when Hg was extracted from different types of water such as river, seawater, groundwater, and tap water, showing this extraction system as a global solution when dealing with natural waters. Interestingly, this Hg collected in the PIM has shown to be stable for at least 6 months without the use of any preservative. This fact is of prime importance taking into account the usual stability problems of Hg during sample storage.
提出了一种新颖而简单的方法，通过将含有任务特异性离子液体三辛基甲基铵硫代水杨酸酯（TOMATS）的聚合物整体膜（PIM）萃取，用于从天然水中预浓缩和测定汞（Hg），然后进行能量色散 X 射线荧光（EDXRF）分析。测定直接在膜上进行，无需任何处理或洗脱步骤，并且由于 PIM 的特性，在 EDXRF 分析中不需要进行基质或厚度校正。在最佳萃取和 EDXRF 操作条件下，Hg 的检出限为 0.2μgHgL。此外，当从不同类型的水（如河水、海水、地下水和自来水）中萃取 Hg 时，未观察到水基质效应，表明该萃取系统在处理天然水时是一种通用解决方案。有趣的是，这种在 PIM 中收集的 Hg 无需使用任何防腐剂即可稳定至少 6 个月。考虑到 Hg 在样品储存过程中通常存在的稳定性问题，这一事实非常重要。
