Flow injection potentiometric determination of Fe(III) using a fluoride-selective electrode as detector

M. Bralic; N. Radic

doi:doi:10.1051/analusis:1999106

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Volume 27 / No 1 (January/February 1999)

Analusis, 27 1 (1999) 57-60

Abstract

Free Access

Issue		Analusis Volume 27, Number 1, January/February 1999 Importance de la lipophilie en modélisation moléculaire


Page(s)		57 - 60
Section		Original articles
DOI		https://doi.org/10.1051/analusis:1999106

Analusis 27, 57-60 (1999)
DOI: 10.1051/analusis:1999106

Flow injection potentiometric determination of Fe(III) using a fluoride-selective electrode as detector

M. Bralic and N. Radic

Department of Chemistry and Environmental Chemistry, Faculty of Chemical Technology, University of Split, 21000 Split, Croatia

Abstract
Flow injection analysis (FIA) system incorporating a fluoride ion-selective electrode (FISE) as detector is described. Laboratory-built cascade flow cell equipped with FISE and reference electrode is used for flow injection potentiometric determination of Fe(III) based on monitoring of the formation of FeF₂⁺ in acid solution. Under optimized flow conditions (4.0 mL min^-1, 300 $\mu$ samples, 10^-5 mol L^-1 sodium fluoride in the carrier stream) a rectilinear calibration graph is obtained by plotting the peak height versus concentration of iron in the range of Fe(III) concentration from $1 \times 10^{-4}$ to $1 \times 10^{-1}$ mol L^-1 in a 0.01 mol L^-1 perchloric acid or acetate buffers (pH 2.8; 3.4).