Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 64, Issue 3, Pages 208-214Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2008.12.002
Keywords
Headspace single-drop microextraction; Hydride sequestration; Pd(II) trapping agent; ETV-ICP-MS; Multielement determination
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Funding
- Spanish Education and Science Ministry [CTQ2006-04111/BQU]
- Galician government (Xunta de Galicia)
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A headspace single-drop microextraction (HS-SDME) method has been developed in combination with electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS) for the simultaneous determination of As, Sb, Bi, Pb, Sn and Hg in aqueous Solutions. Vapor generation is carried out in a 40 mL volume closed-vial containing a solution with the target analytes in hydrochloric acid and potassium ferricyanide Medium. Hydrides (As, Sb, Bi, Pb, Sn) and Hg vapor are trapped onto an aqueous single drop (3 mu L Volume) containing Pd(II), followed by the Subsequent injection in the ETV. Experimental variables Such as medium composition, sodium tetrahydroborate (III) volume and concentration, stirring rate, extraction time, sample Volume, ascorbic acid concentration and palladium amount in the drop were fully optimized. The limits of detection (LOD) (3 sigma criterion) of the proposed method for As, Sb, Bi, Pb, Sn and Hg were 0.2, 0.04, 0.01, 0.07, 0.09 and 0.8 mu g/L, respectively. Enrichment factors of 9, 85, 138. 130, 37 and 72 for As, Sb, Bi, Pb, Sn and Hg, respectively, were achieved in 210 s. The relative standard deviations (N = 5) ranged from 4 to 8%. The proposed HS-SDME-ETV-ICP-MS method has been applied for the determination of As, Sb, Bi, Ph, Sn and Hg in NWRI TM-28.3 certified reference material. (C) 2008 Elsevier B.V. All rights reserved.
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