In a supporting electrolyte containing NH3-NH4Cl, a reduction peak of droperidol (Dro) has been found by linear-sweep voltammetry at Hg electrode. The peak shows a potential of -1.46 V (Vs. Ag/AgCl) and adsorptive characteristics. When the concentration of Dro is sufficiently small, the sweep rate sufficiently rapid and the accumulating time sufficiently long, the peak current is totally contributed by the reduction of adsorbed Dro. The adsorbed species is most probably neutral mols. of Dro. The saturated amount of Dro adsorption on Hg electrode is 1.12 ?10-10 mol譪m-2 and every Dro mol. occupies 1.48 nm2. The transfer coefficient a of the irreversible adsorptive system of Dro is found to be 0.58. The detection limit of adsorptive stripping voltammetry of Dro is 1.0 ?10-9 mol譫m-3.

Key words: DETERMINATION, ADSORPTION, REDUCTION, AMMONIA, MERCURY ELECTRODE, ELECTRODE REACTION, OPTIMUM CONDITION