Abstract
The electrochemical oxidation of dissolved azide anion has been investigated at the basal plane of highly oriented pyrolytic graphite. Cyclic and linear sweep voltammetry and differential pulse voltammetry were employed to study the oxidation reaction mechanism in neutral pH as a function of the potential sweep rate, analyte concentration, and electrolyte composition and in the presence of adsorbed anthraquinone-2,6-disulfonate (2,6-AQDS). The linear dynamic range in the differential pulse voltammetric measurements was 4 orders of magnitude and the estimated limit of detection (SNR = 3) was ∼2.3 × 10-7 M (9.7 ppb). The electron-transfer kinetics for azide oxidation appear rapid at this surface, and the voltammetric features are independent of the fraction of exposed edge plane, the presence of surface oxides, the electrolyte composition, and the adsorption of 2,6-AQDS. The reaction is shown to proceed by an EC(dim) mechanism. Amperometric detection results for flow injection analysis (FIA) and ion chromat...
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