Martinis Estefanía M, Bertón Paula, Olsina Roberto A, Altamirano Jorgelina C, Wuilloud Rodolfo G
Laboratory of Environmental Research and Services of Mendoza, CCT-CONICET-Mendoza, Av. Ruiz Leal s/n, Parque General San Martín, Mendoza, Argentina.
J Hazard Mater. 2009 Aug 15;167(1-3):475-81. doi: 10.1016/j.jhazmat.2009.01.007. Epub 2009 Jan 15.
A liquid-liquid extraction procedure (L-L) based on room temperature ionic liquid (RTIL) was developed for the preconcentration and determination of mercury in different water samples. The analyte was quantitatively extracted with 1-butyl-3-methylimidazolium hexafluorophosphate ([C(4)mim][PF(6)]) under the form of Hg-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Hg-5-Br-PADAP) complex. A volume of 500 microl of 9.0 mol L(-1) hydrochloric acid was used to back-extract the analyte from the RTIL phase into an aqueous media prior to its analysis by flow injection-cold vapor atomic absorption spectrometry (FI-CV-AAS). A preconcentration factor of 36 was achieved upon preconcentration of 20 mL of sample. The limit of detection (LOD) obtained under the optimal conditions was 2.3ngL(-1) and the relative standard deviation (RSD) for 10 replicates at 1 microg L(-1) Hg(2+) was 2.8%, calculated with peaks height. The method was successfully applied to the determination of mercury in river, sea, mineral and tap water samples and a certified reference material (CRM).
建立了一种基于室温离子液体（RTIL）的液-液萃取方法（L-L），用于不同水样中汞的预富集和测定。分析物以Hg-2-（5-溴-2-吡啶偶氮）-5-二乙氨基苯酚（Hg-5-Br-PADAP）络合物的形式，用1-丁基-3-甲基咪唑六氟磷酸盐（[C(4)mim][PF(6)]）进行定量萃取。在通过流动注射-冷蒸气原子吸收光谱法（FI-CV-AAS）分析之前，用500微升9.0 mol L(-1)盐酸将分析物从RTIL相反萃取到水相中。对20 mL样品进行预富集时，预富集因子达到36。在最佳条件下获得的检测限（LOD）为2.3 ng L(-1)，以峰高计算，1 μg L(-1) Hg(2+)进行10次重复测定的相对标准偏差（RSD）为2.8%。该方法成功应用于河水、海水、矿泉水和自来水样品以及一种有证标准物质（CRM）中汞的测定。
