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The variables affecting determination of ultra trace
levels of uranium (VI) in aqueous samples by differential pulse cathodic
stripping voltammetry were examined in detail using Hg-thin film modified
carbon paste and multiwall carbon nanotube (MWCNT) incorporated carbon paste
electrode. Carbon paste electrode prepared in the laboratory was modified
with Hg thin film and used as the working electrode. MWCNT was incorporated
into the carbon paste for enhancement in sensitivity of the measurements.
Electrochemical response for the uranium (VI) reduction peak was found to be
well resolved on the thin mercury film modified carbon paste surface and also
with the MWCNT modification. Characteristics of the adsorption preconcentration
process were investigated using electrochemical impedance measurements.
Electrochemical signals were observed to be enhanced on MWCNT modification of the