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Type: Artigo de periódico
Title: Sequential Spectrophotometric Determination Of Chromium(iii) And Chromium(vi) Using Flow Injection Analysis
Author: De Andrade J.C.
Rochat J.C.
Baccan N.
Abstract: A flow injection analysis (FIA) procedure for the speciation of Cr(III) and Cr(VI) using the 1,5-diphenylcarbazide (DPC) method is presented. As Cr(III) does not interfere in the Cr(VI) - DPC reaction, both Cr(VI) and total chromium [after the on-line oxidation of Cr(III) by Ce(IV)] are sequentially determined. Cr(III) is obtained by difference. Under the experimental conditions described, the calibration graphs are linear up to 2 μg mh1 of Cr(VI) and 4 μg ml-1 of Cr(III). The detection limits found were 18 ng ml -1 for Cr(VI) and 55 ng ml-1 for Cr(III), at a signal to noise ratio of 3. The common interfering elements in the Cr(VI) - DPC reaction were investigated under dynamic FIA conditions. The FIA method was also compared with the conventional spectrophotometric procedure.
Citation: The Analyst. , v. 110, n. 2, p. 197 - 199, 1985.
Rights: aberto
Date Issue: 1985
Appears in Collections:Unicamp - Artigos e Outros Documentos

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