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metadata.dc.type: | Artigo de Periódico |
Title: | Application of multivariate technique in method development for the direct determination of copper in petroleum condensate using graphite furnace atomic absorption spectrometry |
Other Titles: | Journal of Analytical Atomic Spectrometry |
Authors: | Santos, Walter Nei Lopes dos Dias, Fábio de Souza Fernandes, M. S. Rebouças, Márcio das Virgens Vale, Maria Goreti Rodrigues Welz, Bernhard Ferreira, Sergio Luis Costa |
metadata.dc.creator: | Santos, Walter Nei Lopes dos Dias, Fábio de Souza Fernandes, M. S. Rebouças, Márcio das Virgens Vale, Maria Goreti Rodrigues Welz, Bernhard Ferreira, Sergio Luis Costa |
Abstract: | A method has been developed for the direct determination of copper in petroleum condensate using detergentless micro-emulsions (three-component solutions) and graphite furnace atomic absorption spectrometry. The optimization was performed using a three-level full factorial design, resulting in pyrolysis and atomization temperatures of 920 °C and 2600 °C, respectively. Using the secondary copper line at 327.4 nm, which is less affected by the magnetic field of the Zeeman-effect background correction system, a characteristic mass of 39 pg, and detection limit of 0.4 μg l−1 was obtained using 20 μl of micro-emulsion, which corresponds to 1.2 μg l−1 in petroleum condensate. The precision, expressed as relative standard deviation, was 2.0% or 2.8% for copper concentrations of 30 μg l−1 and 5.0 μg l−1, respectively. The spike recovery of 105% for copper added to a petroleum condensate sample proved that this procedure could be applied satisfactorily to a determination in this matrix. |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/14001 |
Issue Date: | 2005 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
Files in This Item:
File | Description | Size | Format | |
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W. N. L. dos Santos.pdf | 563,08 kB | Adobe PDF | View/Open |
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