Título:	Feasibility of Using AAS for the Characterization of a Tuna Fish Candidate Reference Material for Total Hg and Methyl-Hg Measurement
Autoria:	CHELEGAO, R. CARIONI, V. M. O. NAOZUKA, J. NOMURA, C. S.
Afiliação:	RODRIGO CHELEGAO, CPAMT; VIVIAN M. O. CARIONI, USP; JULIANA NAOZUKA, UNIFESP; CASSIANA S. NOMURA, USP.
Ano de publicação:	2016
Referência:	Journal of the Brazilian Chemical Society, vol. 27, N. 4, p. 712-718, abr. 2016.
Conteúdo:	This work describes the evaluation of several parameters for preparing a tuna fish candidate reference material (RM) in order to measure its total Hg and methyl-Hg mass fractions by cold vapor atomic absorption spectrometry (CV-AAS) and solid sampling graphite furnace atomic absorption spectrometry (SS-GF AAS). Best results were acquired after extraction with toluene and L-cysteine for 15 min at 80 °C. The parameters investigated were stability of chemical composition during production, homogeneity and analyte segregation. No analyte segregation was observed and the material was shown to be stable even when stored at 50 °C for 10 months. Total Hg mass fraction was 3.03 ± 0.22 μg g-1 by CV AAS, 2.99 ± 0.43 μg g-1 by SS-GF AAS and 2.95 ± 0.15 μg g-1 by direct mercury analyser (DMA). Methyl-Hg mass fraction was 2.49 ± 0.13 μg g-1 by CV AAS and 2.44 ± 0.46 μg g-1 by SS-GF AAS.
NAL Thesaurus:	Atomic absorption spectrometry
Palavras-chave:	Reference material Tuna fish Total Hg Methyl-Hg
ISSN:	0103-5053
Digital Object Identifier:	http://dx.doi.org/10.5935/0103-5053.20150320
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAMT)