Abstract
ABSTRACT An instrument for measuring the liquid water content of aerosols is described. Aerosol samples are collected on PTFE membrane filters and then are placed in a closed chamber in which the relative humidity can be controlled over a range from 5 to 95%. A β-gauge measures the changing aerosol mass from a low humidity through a range of increasing humidities and then through a range of decreasing humidities. The instrument corrects for changes in air density in the β-gauge. A method for correcting electronic drift is described. A comparison of liquid water mass measurements of a test aerosol with gravimetric mass measurements gave a regression slope of 0.98 and a standard deviation of 0.7μg/m3. Examples of analyses on a generated aerosol and a fine fraction atmospheric sample are given.
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