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Methylmercury Determination in Biota by Solid-phase Microextraction by Luis Carrasco; Sergi Díez; Josep M. Bayona is a Chemistry article available to read on EtoBox.

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Aqueous-phase alkylation followed by, headspace solid-phase microextraction (SPME) for mercury speciation in biota, was developed a decade ago. Despite this, matrix effects in this technique have not yet been addressed. In this paper, the importance of these effects has been assessed and overcome by standard addition calibration. Furthermore, improvements were made in the extraction of methylmercury (MeHg) from biological matrixes by optimizing the matrix digestion procedure (temperature and digestion time) and the SPME parameters (aliquot volume of digested samples, extraction temperature and fibre coating), which aimed to minimize the matrix effects. Accordingly, samples were alkaline digested (KOH, 25%, w/v, 60 • C, 180 min) and an aliquot was propylated using an aqueous NaBPr 4 solution, headspace SPME sampling and, finally, by using GC-pyrolysis (Py)-atomic fluorescence spectrometry (AFS) determination. The procedure developed was validated using dogfish muscle reference material NRCC DORM-2.

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Author

Luis Carrasco; Sergi Díez; Josep M. Bayona

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)