https://repositorio.ufba.br/handle/ri/7857
Tipo: | Artigo de Periódico |
Título: | Nickel and zinc determination by flow-injection solid-phase spectrophotometry exploiting different sorption rates |
Título(s) alternativo(s): | Talanta |
Autor(es): | Teixeira, Leonardo Sena Gomes Rocha, Fábio Rodrigo Piovezani Korn, Mauro Reis, Boaventura F. Ferreira, Sergio Luis Costa Costa, Antonio Celso Spinola |
Autor(es): | Teixeira, Leonardo Sena Gomes Rocha, Fábio Rodrigo Piovezani Korn, Mauro Reis, Boaventura F. Ferreira, Sergio Luis Costa Costa, Antonio Celso Spinola |
Abstract: | Flow-injection solid-phase spectrophotometry is applied for sequential determination of nickel and zinc, exploiting their different sorption rates on 1-(2-thiazolylazo)-2-naphthol (TAN) immobilized on C18-bonded silica. The Zn(II) sorption rate on the solid support is constant for flow rates ranging from 0.70 to 2.2 ml min−1, but for Ni(II) the sorption rate decreases with increasing flow rate. A flow system was designed to perform sequential measurements at two different flow rates (0.85 and 1.9 ml min−1). The absorbance was measured at 595 nm, where both TAN-immobilized complexes showed maximum absorption. The coefficients of variation were estimated (n=10) as 1.1 and 1.7% (at 1.9 ml min−1) and 1.2 and 2.1% (at 0.85 ml min−1) for zinc and nickel, respectively. This strategy was applied to determine zinc and nickel in copper-based alloys and the results agreed with certified values at the 95% confidence level. The sample throughput was estimated as 36 h−1. |
Palavras-chave: | Solid-phase spectrophotometry Sorption rates Flow-injection analysis Nickel Zinc Copper-based alloys |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/7857 |
Data do documento: | 2000 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivo | Descrição | Tamanho | Formato | |
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Teixeira.pdf Restricted Access | 109,77 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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