engleski

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

Flow injection analysis (FIA) system incorporating a fluoride ion-selective electrode (FISE) as detector is described. Laboratory-build 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 mL 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× 10-4 to 1× 10-1 mol L-1 in a 0.01 mol L-1 perchloric acid or acetate buffers (pH 2.8; 3.4).

Flow-injection analysis; iron(III); fluoride ion-selective electrode

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