Total Mercury, Inorganic Mercury and Methyl Mercury Determination in Red Wine |
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Authors: | Valderi Luiz Dressler Clarissa Marques Moreira Santos Fabiane Goldschmidt Antes Fabrina Regia Stum Bentlin Dirce Pozebon and Erico Marlon Moraes Flores |
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Affiliation: | (1) Departamento de Qu?mica, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil;(2) Instituto de Qu?mica, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, Brazil |
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Abstract: | This study deals with the development of a method for total Hg, inorganic Hg and methylmercury (MeHg) determination in red
wine by using flow injection-cold vapour generation–inductively coupled plasma mass spectrometry (FI-CVG-ICP-MS) and gas chromatography-ICP-MS
(GC-ICP-MS). For Hg speciation analysis, a derivatization step was carried out using a 1% (m/v) sodium tetraphenylborate (NaBPh4) solution, followed by extraction of Hg species and their quantification by GC-ICP-MS. The main parameters evaluated were
the make-up gas flow rate, volume of the NaBPh4 solution, time for derivatization reaction/analyte extraction and solvent used for Hg species extraction. Accuracy was evaluated
by analyte recovery, whereas recoveries ranged from 99% to 104% for Hg(II) and MeHg. The limits of detection (LODs) for Hg(II)
and MeHg were 0.77 and 0.80 μg L−1, respectively. Wine from Argentina, Brazil, Chile and Uruguay were analysed. The wine samples were also acid digested for
total Hg determination by FI-CVG-ICP-MS. The LOD of the method used for total Hg determination was 0.01 μg L−1. The concentrations of Hg species in red wine measured by GC-ICP-MS were lower than the respective LODs. Only total Hg was
detected in the analysed samples, where the highest concentration of Hg found was 0.55 ± 0.02 μg L−1. |
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