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 Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.


Voltammetric study of FeS layer on the Hg electrode in supersaturated FeS chloride solution

Damir Krznarić, Irena Ciglenečki

Abstract

Cyclic voltammetry at the Hg electrode was used for the study of FeS layer formed on the electrode surface during scanning potential in the saturated FeS suspension containing FeS nanoparticles in chloride electrolyte. Newly presented results as a part of comprehensive study on FeS electrochemistry in model and natural samples confirm that voltammetric peak at -1.1 V, which can often be recorded in anoxic waters containing Fe and sulphide species, represents reduction of Fe2+ on the Hg electrode surface modified by the FeS layer. Fe(0) deposited on such modified Hg surface is reoxidizable, often producing two oxidation peaks situated between -0.8 and -0.6 V (vs. Ag/AgCl). These peaks represent two different Fe(0) oxidation products, free Fe2+ and Fe2+ chloro complexes, FeCl+. By scanning potential from -0.75 V in positive direction, an oxidation exchange peak of Hg and FeS at around -0.45 V occurs, which can be taken as a measure for FeS nanoparticles from bulk solution.

EN14016  Accepted 10 May 2014
 
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