DANA ELENA POPA, MIHAELA BULEANDRA, MIHAELA MURESEANU, MARCEL IONICA, ION GH. TANASE<br>Carbon Paste Electrode Modified with Organofunctionalized Mesoporous Silica for Electrochemical  Detection and Quantitative Determination of Cadmium(II) using Square Wave Anodic Stripping Voltametry

DANA ELENA POPA, MIHAELA BULEANDRA, MIHAELA MURESEANU, MARCEL IONICA, ION GH. TANASE
Carbon Paste Electrode Modified with Organofunctionalized Mesoporous Silica for Electrochemical Detection and Quantitative Determination of Cadmium(II) using Square Wave Anodic Stripping Voltametry

Abstract:

A carbon paste electrode modified with mesoporous silica functionalized with acetyl-acetone (AcAcNH2-HMS) was prepared, characterized and used for cadmium (II) quantitative determination in aqueous media. The measurements were made using square wave anodic stripping voltammetry, which implies two steps: an open circuit analyte accumulation on the electrode and the electrolysis of the accumulated cadmium and its determination. The influence of some experimental variables such as carbon paste composition, working solution pH, the supporting electrolyte concentration, accumulation potential and accumulation time were studied. The prepared and characterized modified carbon paste electrode demonstrated a linear response over the concentration range between 80 and 2000 ppb cadmium, with an accumulation time of 120 s and an accumulation potential of -1.4 V vs. ESC. The effects of potential interfering ions were studied. The prepared electrode was used for cadmium determination in natural and residual water samples and spiked samples, with good results in accuracy and precision studies. Keywords: modified carbon paste electrode, organofunctionalized silica, cadmium, square wave anodic stripping voltammetry

Issue: 2010, Volume 61, Issue 2

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