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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/14330
Tipo: Artigo de Periódico
Título: Method development for the determination of manganese, cobalt and copper in green coffee comparing direct solid sampling electrothermal atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry
Título(s) alternativo(s): Talanta
Autor(es): Oleszczuk, Nédio
Castro, Jacira T.
Silva, Márcia M. da
Korn, Maria das Graças Andrade
Welz, Bernhard
Vale, Maria Goreti R.
Autor(es): Oleszczuk, Nédio
Castro, Jacira T.
Silva, Márcia M. da
Korn, Maria das Graças Andrade
Welz, Bernhard
Vale, Maria Goreti R.
Abstract: A method has been developed for the determination of cobalt, copper and manganese in green coffee using direct solid sampling electrothermal atomic absorption spectrometry (SS-ET AAS). The motivation for the study was that only a few elements might be suitable to determine the origin of green coffee so that the multi-element techniques usually applied for this purpose might not be necessary. The three elements have been chosen as test elements as they were found to be significant in previous investigations. A number of botanical certified reference materials (CRM) and pre-analyzed samples of green coffee have been used for method validation, and inductively coupled plasma optical emission spectrometry (ICP OES) after microwave-assisted acid digestion of the samples as reference method. Calibration against aqueous standards could be used for the determination of Mn and Co by SS-ET AAS, but calibration against solid CRM was necessary for the determination of Cu. No significant difference was found between the results obtained with the proposed method and certified or independently determined values. The limits of detection for Mn, Cu and Co were 0.012, 0.006 and 0.004 μg g−1 using SS-ET AAS and 0.015, 0.13 and 0.10 μg g−1 using ICP OES. Seven samples of Brazilian green coffee have been analyzed, and there was no significant difference between the values obtained with SS-ET AAS and ICP OES for Mn and Cu. ICP OES could not be used as a reference method for Co, as essentially all values were below the limit of quantification of this technique.
Palavras-chave: Electrothermal atomic absorption spectrometry
Inductively coupled plasma optical emission spectrometry
Solid sampling
Coffee
Cobalt
Copper
Manganese
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/14330
Data do documento: 2007
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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