Validation and application of an analytical method for monomethylmercury quantification in aquatic plant tissues [An article from: Analytica Chimica Acta]

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Description:
An analytical methodology for monomethylmercury (MMHg) determination in aquatic plant tissues with low detection limit (346pgg^-^1) is proposed. It consists of acid digestion (HBr/CuSO"4), cleanup step with a Na"2S 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 (@a=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 (