期刊
TALANTA
卷 78, 期 2, 页码 537-541出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2008.12.003
关键词
Mercury speciation; Ionic liquid; Single-drop microextraction; Liquid chromatography
资金
- Xunta de Galicia
- Universidade de Vigo
- Spanish Government [PET2006-706-00, CTQ2005-09079-C03-01/BQU, CTQ2006-0411/BQU]
- Regional Governments of Comunidad Valenciana and Galicia [ACOMP07/053, ARVIV/2007/062, PGIDIT05PXIB31401PR]
- EU
Room temperature ionic liquids can be considered as environmentally benign solvents with unique physicochemical properties. Ionic liquids can be used as extractant phases in SDME being compatible, with chromatographic systems. A single-drop microextraction method was developed for separation and preconcentration of mercury species (MeHg+, EtHg+, PhHg+ and Hg2+), which relies on the formation of the corresponding dithizonates and microextraction of these neutral chelates onto a microdrop of an ionic liquid. Afterwards, the separation and determination were carried out by high-performance liquid chromatography with a photodiode array detector. Variables affecting the formation and extraction of mercury dithizonates were optimized. The optimum conditions found were: microextraction time, 20 min; stirring rate, 900 rpm: pH, 11; ionic liquid type, 1-hexyl-3-methylimidazolium hexafluorophosphate ([C6MIM][PF6]); drop volume, 4 mu L; and no sodium chloride addition. Limits of detection were between 1.0 and 22.8 mu g L-1 for the four species of mercury, while the repeatability of the method, expressed as relative standard deviation, was between 3.7 and 11.6% (n=8). The method was finally applied to the determination of mercury species in different water samples. (C) 2008 Elsevier B.V. All rights reserved.
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