A compact mercury vapour concentration meter

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Abstract
A compact and simple instrument is described for the measurement of mercury vapour concentration in the atmosphere. The detector element is a vacuum-deposited gold film about 10 nm thick. Absorption of mercury vapour by this film produces a change in electrical resistance, the time derivative of which is proportional to the concentration of mercury vapour in the vicinity of the detector. The instrument compensates for the fall in detector sensitivity with continued exposure to the vapour. Detector elements may be regenerated by electrical self-heating, to drive off absorbed mercury. Vapour concentrations of less than 10 mu g Hg m-3 may be measured.

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