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Electrochemical Reduction of Europium(3+) at Increasing Concentrations of Different Salts. Part I. Voltammetric Measurements

Under the influence of spectroscopic results, which seem to indicate an increase of the hydration number at decreased water activity in perchlorate and (some) chloride solutions, the reinvestigation of europium(+3) electrochemical reduction in different electrolytes was performed. The influences of the mentioned anions on the electrode response in square wave voltammetry are really similar if peak potential shift and peak height decrease are followed in dependence on the electrolyte concentration. In nitrate, bromide and iodide media, results differ significantly due to europium(+3) inner sphere complexation or change of the electrode kinetics in the presence of adsorbed anions. It stays questionable if the corresponding results (together with those arising from dc polarography) could be used for diagnostic purposes in solutions of europium(+3) and less common electrolytes, i.e. for distinguishing of the processes which include “ inert” , surface active or complex forming anions.

europium; hydration; square wave voltammetry; electrolyte; complex formation; adsorption

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