Abstract
An electrocatalytic amperometric detector for the ion chromatographic determination of CN − is described. A conducting composite that is based on a graphite-loaded sol–gel material comprises the working electrode. The composite is doped with a Ru II metallodendrimer which is demonstrated to promote the electrochemical oxidation of CN − at potentials positive of 0.5 V vs. Ag/AgCl. In 6 mM NaOH, 0.05 M NaCl flowed at 1.0 ml min −1, a 5-point calibration curve with the following linear least squares parameters is obtained over the range, 1.0–30 M CN −: slope, 24.2±0.1 nA M −1; intercept, −6±2 nA; and r, 0.9997. The detection limit, 0.7 μM CN −, compares favorably to that obtained by amperometry at a silver electrode, 0.5 μM CN −, under comparable experimental conditions. A 60-min preconcentration by Donnan dialysis increases the sensitivity by a factor of 23.6.
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