Journal
ANALYTICA CHIMICA ACTA
Volume 743, Issue -, Pages 69-74Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.07.015
Keywords
Liquid-phase microextraction; Hollow fiber microextraction; Mercury; Electrothermal atomic absorption spectrometry; Waters
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Funding
- Comunidad Autonoma de la Region de Murcia (CARM, Fundacion Seneca) [11796/PI/09]
- Spanish MICINN [CTQ2009-08267/BQU]
- Universidad CentroOccidental Lisandro Alvarado (UCLA), Venezuela
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A three-phase liquid microextraction procedure for the determination of mercury at low concentrations is discussed. To the aqueous sample placed at pH 7 by means of a phosphate buffer, 0.002% (m/v) 1-(2-pyridylazo)-2-naphthol (PAN) is incorporated, and the mixture submitted to microextraction with a hollow-fiber impregnated with toluene and whose lumen contains a 0.05 mol L-1 ammonium iodide solution. The final measurement of the extract is carried out by electrothermal atomic absorption spectrometry (300 degrees C and 1100 degrees C for the calcination and atomization temperatures, respectively). The pyrolytic graphite atomizer is coated electrolytically with palladium. An enrichment factor of 270, which results in a 0.06 mu g L-1 mercury for the detection limit is obtained. The relative standard deviation at the 1 mu g L-1 mercury level is 3.2% (n = 5). The reliability of the procedure is verified by analyzing waters as well as six certified reference materials. (C) 2012 Elsevier B.V. All rights reserved.
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