Determination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species

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DOIResolve DOI: http://doi.org/10.1039/b000883o
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TypeArticle
Journal titleJournal of Analytical Atomic Spectrometry
ISSN0267-9477
Volume15
Issue7
Pages837842; # of pages: 6
AbstractDirect coupling of solid-phase microextraction (SPME) with inductively coupled plasma mass spectrometry (ICP-MS) is described for methylmercury speciation. A thermal desorption interface, consisting of a heated, glass-lined splitless-type GC injector, was placed directly at the base of the torch to minimize the length of transfer line. This arrangement provides for fast desorption and high sample introduction efficiency. Direct liquid immersion and headspace extraction of methylmercury was studied, including the effect of temperature and time on the extraction efficiency. For clean solutions, immersion sampling SPME provided good sensitivity that was linear over two orders of magnitude whereas headspace sampling showed 15% lower sensitivity, but a linear range of more than three orders of magnitude. The detection limit for headspace methylmercury sampling was 0.2 ng ml−1. Calibration by the method of additions using direct extraction revealed a severe matrix effect with biological tissue samples, diminishing the methylmercury response 70-fold, whereas that obtained by headspace extraction was statistically indistinguishable from signals generated using matrix free standards. Analytical results showed good agreement between certified and measured values for analysis of NRCC DORM-2, (Dogfish muscle) and DOLT-2 (Dogfish liver) reference materials.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedNo
Identifier10391186
NRC number140
NPARC number8900155
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Record identifiera3ed0575-8ca3-4107-b87a-2ab80a0ebd7d
Record created2009-04-22
Record modified2016-05-09
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