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Carbon monoxlde is first reacted wlth mercuric oxide at 210 OC to produce mercury vapor. The mercury vapor liberated Is then adsorbed on the gold electrode of the pleroeiectric crystal, thereby Increasing the mass on the crystal and decreasing Its frequency of vibration. The change of frequency Is proportional to the amount of mercury present and is indlcative of the carbon monoxlde content of the alr. Reverslbllity can be achieved by thermal desorption. By use of a reference stream, the background due to the thermal decampositton of mercuric oxlde is compensated. The effect of moisture and interferences from other reduclng gases can be eilmlnated by use of a precolumn. The detector Is slmpie, inexpensive, and portable. Concentratlons In the part-permiillon and part-per-billion ranges can be detected by varylng the sample size.

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