The Efficiency of the Condensation Method for Sampling Certain Vapors

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Abstract
A condensation method is described which is adequate for the collection of water vapor in air. When a 16-mm. U-tube is used, with sampling at 1/2 liter per min. for 200 liters, about 97% of the moisture is caught. Increasing the rate of sampling to 1 liter per min. lowers the efficiency to about 88%. With a 21-mm. U-tube and a sampling rate of 1/2 l. per min., about 94% of the moisture is caught. Under these same conditions it may be expected that the efficiency of the tube for the collection of substances having vapor pressures comparable to water, or lower, e.g., mercury vapor, should be very high. Bromine, or substances'' having comparable vapor pressures, cannot be collected by the condensation method under the conditions of the expt. However, Br can be caught completely with a single sintered glass bubbler in KI soln. when sampled at the rate of 1/2 l. per min.

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