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Fully automatic on-line separation preconcentration system for electrothermal atomic absorption spectrometry: determination of cadmium and lead in sea-water.
Fernández, F M; Stripeikis, J D; Tudino, M B; Troccoli, O E.
Afiliação
  • Fernández FM; Departamento de Química Inorgánica, Analítica y Química Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
Analyst ; 122(7): 679-84, 1997 Jul.
Article em En | MEDLINE | ID: mdl-9330038
An automatic separation preconcentration system coupled to an electrothermal (graphite furnace) atomic absorption spectrometer is described. The preconcentration step is performed on a chelating resin microcolumn (Chelex-100) placed in the injection tip of the autosampler. A time based manifold with two- and three-way solenoid valves commanded by an eight channel microcomputer programmable controller is used for column conditioning, preconcentration and washing steps; no manual operations are involved. Elution is performed by the programmable graphite furnace autosampler and achieved in only one step. Operations involving complete and partial injection of the eluate into the graphite furnace are also discussed. The system was applied to the determination of Cd and Pb in near shore sea-water from Patagonia, Argentina. Detection limits of 1 and 8 ng l-1 were obtained for Cd and Pb respectively. Analysis of a certified reference material (CASS-3) showed good agreement with the certified values.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água do Mar / Cádmio / Chumbo Tipo de estudo: Diagnostic_studies Idioma: En Revista: Analyst Ano de publicação: 1997 Tipo de documento: Article País de afiliação: Argentina País de publicação: Reino Unido
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água do Mar / Cádmio / Chumbo Tipo de estudo: Diagnostic_studies Idioma: En Revista: Analyst Ano de publicação: 1997 Tipo de documento: Article País de afiliação: Argentina País de publicação: Reino Unido