The electrochemical oxidation reaction of nitrogen dioxide (NO 2 ) using boron doped diamond (BDD) electrodes is presented. Cyclic voltammetry of NO 2 in a 0.1 M KClO 4 solution exhibits oxidation peaks at + 1.1 V and + 1.5 V (vs. Ag/AgCl) which are attributable to oxidation of HONO and NO 2 À , respectively. Moreover, the pH and scan rate dependences were investigated to study the oxidation mechanism. A linear calibration curve was observed in the concentration range of ~1 to 5 mM (R 2 = 0.99) with a detection limit of 11.1 ppb (S/B = 3) for HONO and 58.6 ppb (S/B = 3) for NO 2 À . In addition, the analytical performance was compared with those using glassy carbon, platinum and stainless steel as the working electrode.

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