Laboratory of Analytical Chemistry for Research and Development (QUIANID), Instituto de Ciencias Básicas, Universidad Nacional de Cuyo, Padre J. Contreras 1300, Parque Gral. San Martín, M5502JMA Mendoza, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina; Instituto de Química de San Luis, Universidad Nacional de San Luis (INQUISAL-UNSL), San Luis, Argentina.
Talanta. 2013 Nov 15;116:133-40. doi: 10.1016/j.talanta.2013.05.001. Epub 2013 May 9.
A simple and green technique named polymer-supported ionic liquid solid phase extraction (PSIL-SPE) was developed for mercury (Hg) species determination. Inorganic Hg (InHg) species was complexed with chloride ions followed by its introduction into a flow injection on-line system to quantitatively retain the anionic chlorocomplex (HgCl4(2-)) in a column packed with CYPHOS(®) IL 101-impregnated resin. The trapped InHg was then reduced with stannous chloride (SnCl2) and eluted with the same flow of reducing agent followed by cold vapor atomic absorption spectrometry (CV-AAS) detection. Organic mercury species (OrgHg) did not interact with the impregnated resin and were not retained into the column. Total concentration of OrgHg was evaluated by difference between total Hg and InHg concentration. A 95% extraction efficiency was achieved for InHg when the procedure was developed under optimal experimental conditions. The limit of detection obtained for preconcentration of 40 mL of sample was 2.4 ng L(-1) InHg. The relative standard deviation (RSD) was 2.7% (at 1 µg L(-1) InHg and n=10) calculated from the peak height of absorbance signals (Gaussian-shape and reproducible peaks). This work reports the first polymer-supported IL solid phase extraction approach implemented in a flow injection on-line system for determination of Hg species in mineral, tap and river water samples.
一种名为聚合物支撑离子液体固相萃取（PSIL-SPE）的简单绿色技术被开发用于汞（Hg）形态的测定。无机汞（InHg）形态与氯离子络合，然后将其引入流动注射在线系统，以定量保留填充有 CYPHOS（®）IL 101 浸渍树脂的柱中阴离子氯络合物（HgCl4（2-））。然后用氯化亚锡（SnCl2）还原捕获的 InHg，并以相同的还原剂流量洗脱，随后用冷原子吸收光谱法（CV-AAS）检测。有机汞形态（OrgHg）不与浸渍树脂相互作用，也不被保留在柱中。总 OrgHg 浓度通过总 Hg 与 InHg 浓度的差值来评估。在最佳实验条件下开发该程序时，InHg 的萃取效率达到 95%。对 40 mL 样品进行预浓缩时，检测限为 2.4 ng L（-1）InHg。从吸光度信号的峰高（高斯形状和可重现的峰）计算，相对标准偏差（RSD）为 2.7%（在 1 µg L（-1）InHg 和 n=10 时）。本工作报道了在流动注射在线系统中首次用于测定矿物、自来水和河水样品中 Hg 形态的聚合物支撑 IL 固相萃取方法。
