TITLE

Mercury speciation in thawed out and refrozen fish samples by gas chromatography coupled to inductively coupled plasma mass spectrometry and atomic fluorescence spectroscopy

AUTHOR(S)
Krystek, Petra; Ritsema, Rob
PUB. DATE
January 2005
SOURCE
Analytical & Bioanalytical Chemistry;Jan2005, Vol. 381 Issue 2, p354
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Different sub-sampling procedures were applied for the determination of mercury species (as total mercury Hg, methylmercury MeHg+ and inorganic mercury Hg2+) in frozen fish meat. Analyses were carried out by two different techniques. After the sample material was pre-treated by microwave digestion, atomic fluorescence spectroscopy (AFS) was used for the determination of total Hg. Speciation analysis was performed according to the following procedure: dissolution of sample material in tetramethylammonium hydroxide (TMAH), derivatisation with sodium tetraethylborate (NaBEt4), extraction into isooctane and measurement with gas chromatography inductively coupled plasma mass spectrometry (GC-ICPMS) for the identification and quantification of methylmercury (MeHg+) and inorganic mercury (Hg2+). The concentration range of total Hg measured in the shark fillets is between 0.9 and 3.6 µg g-1 thawed out shark fillet. Speciation analysis leads to =94% Hg present as MeHg+. Homogeneity, storage conditions and stability of analytical species and sample materials have great influence on analytical results. Sub-sampling of half-frozen/partly thawed out fish and analysis lead to significantly different concentrations, which are on average a factor of two lower.
ACCESSION #
16004489

 

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