https://repositorio.ufba.br/handle/ri/8645
Tipo: | Artigo de Periódico |
Título: | Adsorptive preconcentration for voltammetric measurements of trace levels of vanadium in the presence of copper |
Título(s) alternativo(s): | Analytica Chimica Acta |
Autor(es): | Farias, Pércio Augusto Mardini Ohara, Aniy K. Takase, Iracema Ferreira, Sergio Luis Costa Gold, Jon S. |
Autor(es): | Farias, Pércio Augusto Mardini Ohara, Aniy K. Takase, Iracema Ferreira, Sergio Luis Costa Gold, Jon S. |
Abstract: | An electrochemical stripping procedure for trace measurements of vanadium is described in which preconcentration is achieved by the adsorption of a vanadium-2-(2′-thiazolylaloz)-p-cresol complex on a static mercury drop electrode. Cyclic voltammetry was used to characterize the interfacial and redox behavior. Optimum experimental conditions were found to be the use of a stirred acetate buffer (pH 4.2) solution with a 2-(2′-thiazolylazo)-p-cresol concentration of 1.0 × 10−5 M, a preconcentration potential of 0.00 V, a scan rate of 100 mV s−1 and a linear scan mode. The response is linear over the concentration range 5–30 μg V5+ 1−1. For a 5-min preconcentration time, the detection limit is 3.9 nM. Possible interferences by anions and other trace metals were investigated. Sequential determination of copper with vanadium is possible. The method was applied to the analysis of mineral water. |
Palavras-chave: | Stripping voltammetry Voltammetry Adsorption Copper Preconcentration Vanachum Waters |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/8645 |
Data do documento: | 1993 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
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Farias 01.pdf Restricted Access | 590,58 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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