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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/14495
Tipo: Artigo de Periódico
Título: Investigation of phosphorus atomization using high-resolution continuum source electrothermal atomic absorption spectrometry
Título(s) alternativo(s): Spectrochimica Acta Part B: Atomic Spectroscopy
Autor(es): Dessuy, Morgana B.
Vale, Maria Goreti R.
Lepri, Fábio G.
Welz, Bernhard
Heitmann, Uwe
Autor(es): Dessuy, Morgana B.
Vale, Maria Goreti R.
Lepri, Fábio G.
Welz, Bernhard
Heitmann, Uwe
Abstract: The atomization of phosphorus in electrothermal atomic absorption spectrometry has been investigated using a high-resolution continuum source atomic absorption spectrometer and atomization from a graphite platform as well as from a tantalum boat inserted in a graphite tube. A two-step atomization mechanism is proposed for phosphorus, where the first step is a thermal dissociation, resulting in a fast atomization signal early in the atomization stage, and the second step is a slow release of phosphorus atoms from the graphite tube surface following the adsorption of molecular phosphorus at active sites of the graphite surface. Depending on experimental conditions only one of the mechanisms or both might be active. In the absence of a modifier and with atomization from a graphite or tantalum platform the second mechanism appears to be dominant, whereas in the presence of sodium fluoride as a modifier both mechanisms are observed. Intercalation of phosphorus into the graphite platform in the condensed phase has also been observed; this phosphorus, however, appears to be permanently trapped in the structure of the graphite and does not contribute to the absorption signal.
Palavras-chave: High-resolution continuum source atomic absorption spectrometry
Electrothermal atomization
Phosphorus
Atomization mechanism
Tantalum boat
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/14495
Data do documento: 2007
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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