Abstract
Results are presented of a rotating ring-disc electrode (RRDE) study of the oxygen reduction reaction on gold in the presence and absence of the common inhalation anaesthetic halothane (2-bromo-2-chloro-1,1,1-trifluoroethane). Halothane is itself reduced on gold (at potentials coinciding closely with the second reduction wave for oxygen in basic solution) and this causes some passivation of the electrode surface. The mechanism of oxygen reduction differs on this surface to that on the clean gold but appears to be unaffected by increasing concentrations of halothane in solution. Hence it is deduced that the ratio of the heights of the two waves due to oxygen reduction is independent of oxygen concentration but when halothane is present is proportional to halothane concentration. This hypothesis is then tested for mixtures of the two gases in the solution phase using cyclic voltammetry at microelectrodes and in the gas phase using a clark-type sensor.
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