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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/7857

Title: Nickel and zinc determination by flow-injection solid-phase spectrophotometry exploiting different sorption rates
Other Titles: Talanta
Authors: Teixeira, Leonardo Sena Gomes
Rocha, Fábio Rodrigo Piovezani
Korn, Mauro
Reis, Boaventura F.
Ferreira, Sergio Luis Costa
Costa, Antonio Celso Spinola
Keywords: Solid-phase spectrophotometry;Sorption rates;Flow-injection analysis;Nickel;Zinc;Copper-based alloys
Issue Date: 2000
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.
Description: Texto completo: acesso restrito. p. 1027–1033
URI: http://www.repositorio.ufba.br/ri/handle/ri/7857
ISSN: 0039-9140
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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