Journal
MICROCHEMICAL JOURNAL
Volume 110, Issue -, Pages 28-35Publisher
ELSEVIER
DOI: 10.1016/j.microc.2013.01.006
Keywords
Task specific ionic liquids; Mercury; Methylmercury; Dispersive liquid-liquid microextraction; CV AAS
Categories
Funding
- Poznan University of Technology [31-244/2012 DS-MK]
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Task specific ionic liquid-based ultrasound-assisted dispersive liquid-liquid microextraction (TSIL USA DLLME) combined with cold vapour atomic absorption spectrometry (CV AAS) for determination of mercury species in water and biological samples was developed. The proposed procedure was free of volatile organic solvents, and there was no need to use any dispersive solvents and complexing agents, in contrast to standard DLLME. Analytical signals were obtained without the back-extraction of the mercury species from the TSIL phase into an aqueous phase prior to their determination by CV AAS. The reducing agent Sn2+ could reduce Hg2+ and CH3Hg+ for determination of total mercury. Some essential parameters of the microextraction and cold vapour generation, such as the pH of sample solution, volume of the ionic liquid, ultrasonication time, cooling time, centrifugation time, matrix interferences and salt effect have been studied. Under optimal conditions, high extraction efficiency was achieved for the extraction of 1.0 ng mL(-1) of Hg2+ and 5 ng mL(-1) CH3Hg+ in 10.0 mL of water solution employing 30 mu L of methyltrioctylammonium thiosalicylate as the extraction solvent. The enrichment factor for the method was 310 for Hg2+ and 200 for CH3Hg+. The detection limits were 0.03 ng mL(-1) for Hg2+ and 0.4 ng mL(-1) for CH3Hg+ respectively. The accuracy of the proposed method was evaluated by analysis of the Certified Reference Materials (NRCC DOLT-2, NIST 1643e). The method was applied to analysis of the tap, river, lake and sea water samples. The recoveries for reference materials and spiked samples were in the range of 95-103%. (C) 2013 Elsevier B.V. All rights reserved.
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