Original scientific paper

Kinetic-Potentiometric Determination of Fe(III) using a Fluoride Ion-Selective Electrode

Njegomir Radić ; Laboratory for Analytical Chemistry, Faculty of Technology, University of Split, 58000 Split, Croatia
Josipa Komljenović ; Laboratory for Analytical Chemistry, Faculty of Technology, University of Split, 58000 Split, Croatia

Abstract

A kinetic-potentiometric method is described for the determination of Fe(III), based on monitoring of the formation of FeF2+ in acid solution, using a fluoride ion-selective electrode. The influence of pH and fluoride concentration in cell solution on the kinetics of iron - fluoride reaction was studied. The initial rate of the complex formation reaction, or change in potential during fixed time interval (1 minute), was used to construct calibration graphs. There is a linear relationship between the calculated initial rate or (AEhmin and the concentration of iron in the cell solution. Good linearity (r = 0.9979) was achieved in the range of iron concentration from 3.5 x 10-5 M to 1.4 x MT3 M.

Keywords

Hrčak ID:

137281

URI

https://hrcak.srce.hr/137281

Publication date:

29.2.1992.

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