Adsorptive Stripping Voltammetric Determination of Nanomolar Concentration of Cerium(III) at a Carbon Paste Electrode Modified by N′-[(2-Hydroxyphenyl)Methylidene]-2-Furohydrazide

The aim of this work was to obtain an adsorptive stripping voltammetric method for the Ce(III) determination at a carbon paste electrode, chemically modified with N'-[(2-hydroxyphenyl)methylidene]-2-furohydrazide (NHMF). The electroanalytical procedure comprised two steps: the Ce(III) chemical accumulation at −200 mV followed by the electrochemical detection of the Ce(III)/NHMF complex, using anodic stripping voltammetry. The factors, influencing the adsorptive stripping performance, were optimized including the modifier quantity in the paste, the electrolyte concentrations, the solution pH and the accumulation potential or time. The resulting electrode demonstrated a linear response over a wide range of Ce(III) concentration (5.0–90 nmol dm−3). The detection limit was found to be 0.8 nmol dm−3 on the basis of a signal to noise ratio of 3. The precision for six determinations of 10 and 55 nmol dm−3 Ce(III) was 5.6% and 2.1% (relative standard deviation), respectively. Application of the procedure to the determination of cerium in phosphate rock and wastewater samples gave good results.

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