ANALYTICAL PROCEDURE FOR THE DETERMINATION OF TOTAL MERCURY IN FISH
Journal Title: Българско списание за обществено здраве (Bulgarian Journal of Public Health) - Year 2013, Vol 0, Issue 1
Abstract
Mercury is a toxic element that overaccumulates selectively in the kidneys, brain, pituitary, etc. This requires a strict control of its levels in the environment and food as well as reliable analytical procedures for accurate determination to be developed. Due to the high volatility of mercury compounds and the potential losses during sample preparation, the determination of total mercury by traditional cold vapor atomic absorption or atomic fluorescent spectrometry is a difficult analytical task. The implementation of EPA’s 7473 “Method for direct determination of mercury in solid and liquid samples” through DMA-80, Milestone provides accurate results in a short time and without prior sample preparation. The method for determining total Hg in fish was validated by analyzing a certified reference material “Tuna” (IMEP20). Drying time and decomposition time were optimized. The specific parameters of analytical procedure were as follows: detection limit 0,0005 mg.kg-1, determination limit 0,0008 mg.kg-1, working range from 0,0008 to 6,00 mg.kg-1, analytical yield range 100,9% - 109,3% (n = 9) and within-laboratory reproducibility (RSD) 3,5%. The estimated expanded uncertainty was 0,139 mg.kg-1. Validated analytical procedure was applied to determine total mercury in five species of fish (fillets) from a dam in Northwestern Bulgaria. The total Hg concentrations ranged from 0,030 mg.kg-1 to 0,187 mg.kg-1.
Authors and Affiliations
Lydia Metchkueva, Daniela Stankova, Irina Karadjova, Rositsa Georgieva, Ginka Paunova
Keywords
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