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Issue 3, 2005
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Determination of inorganic mercury and methylmercury in zooplankton and fish samples by speciated isotopic dilution GC-ICP-MS after alkaline digestion

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Abstract

Species-specific isotope dilution (ID) in combination with gas chromatography-inductively coupled plasma-mass spectrometry (GC-ICP-MS) for separation and determination of methylmercury (MeHg) and inorganic mercury (Hg) in fish tissue and zooplankton is described. Samples were digested with methanolic potassium hydroxide. Analytes were derivatized with sodium tetraethylborate and absorbed in an isooctane trap. ID analysis was performed using an enriched spike of 201Hg and a laboratory synthesized enriched spike of Me201Hg. The precision of repeated measurements was always less than 5%. The absolute detection limits obtained with GC-ICP-MS for MeHg and Hg were 2.8 ng and 4.6 ng, respectively. Analytical precision was typically better than 5% over ten repeated measurements. The accuracy of the method has been validated with certified reference materials (DORM-2 and BCR 414). The total mercury concentration results of the real samples as well as the CRM have been compared with those obtained by cold vapor-high resolution ICP-MS using ID approach.

Graphical abstract: Determination of inorganic mercury and methylmercury in zooplankton and fish samples by speciated isotopic dilution GC-ICP-MS after alkaline digestion

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Publication details

The article was received on 12 Jul 2004, accepted on 21 Jan 2005 and first published on 01 Feb 2005


Article type: Technical Note
DOI: 10.1039/B410545A
Citation: J. Anal. At. Spectrom., 2005,20, 236-238
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    Determination of inorganic mercury and methylmercury in zooplankton and fish samples by speciated isotopic dilution GC-ICP-MS after alkaline digestion

    L. Perna, A. LaCroix-Fralish and S. Stürup, J. Anal. At. Spectrom., 2005, 20, 236
    DOI: 10.1039/B410545A

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