Validation and application of an analytical method for monomethylmercury quantification in aquatic plant tissues |
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Authors: | Canário João Caetano Miguel Vale Carlos |
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Institution: | aNational Institute for Agronomy and Fisheries Research, IPIMAR, Av. Brasília, 1449-006 Lisboa, Portugal |
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Abstract: | An analytical methodology for monomethylmercury (MMHg) determination in aquatic plant tissues with low detection limit (346 pg g−1) is proposed. It consists of acid digestion (HBr/CuSO4), cleanup step with a Na2S solution, pre-concentration procedure using a dithizone solution in toluene and quantification by GC–ECD. The performance of the methodology has been tested by determining the MMHg concentrations in the certified reference material Fucus Sea Plant Homogenate—IAEA-140/TM (CRM) and in leaves, stems and roots of the salt marsh plants Sarcocornia fruticosa and Halimione portulacoides. The results obtained for CRM were not statistically different ( = 0.056) from the certified value and repeatability was lower than 2.5% for the plant samples analyzed. This coefficient of variation was similar to those obtained in the externally quality control using within-batch and between-batch (<1.4%). |
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Keywords: | Monomethylmercury Aquatic plant tissues Gas chromatography–electron capture detection |
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