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Type: Artigo de periódico
Title: Polarographic study about the determination of Fe(III) using the technique of differencial pulse polarography.
Author: Aleixo, LM
Sitton, M
Ribeiro, FADL
Abstract: A differential pulse polarographic study with the objective to determine iron (III) in presense of copper (II) in a supporting electrolyte based on citrate EDTA was made. The best experimental conditions found were a supporting electrolyte of citrate 0.25 mol L-1, EDTA 0.050 mol L-1 and KNO3 0.50 mol L-1, pH 5.00. In this media iron (III) showed a polarographic peak in -0.08 V and the copper (II) in -0.34 V, both vs. Ag/AgCI (saturated KCl). Thus, a analytical method was developed and applied to determine iron (III) in brass alloy, a matrix were copper is in large excess over iron. The results obtained showed no interference of copper in the iron determination. The value of 0.21% of iron in the sample alloy composition was obtained and the method was validated by atomic absortion and recovery test, and the results exhibited a good agreement with the proposed method.
Subject: iron (III) determination
differential pulse polarography
brass analysis
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Quimica Nova. Soc Brasileira Quimica, v. 24, n. 6, n. 790, n. 794, 2001.
Rights: aberto
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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