Abstract
An important source of error inherent in diffusive sampling is depletion of the analyte in the region around the open end of the sampler. Error due to depletion occurs when external mass-transfer resistance is significant compared with the sampler's internal mass-transfer resistance. A simple method to correct this error is presented. Multiple diffusive samplers of differing lengths are exposed simultaneously. A plot of calculated concentration of the analyte at the open end of the sampler vs. diffusive flux is extrapolated to a sampler of infinite length, yielding an estimate of concentration in the bulk atmosphere. This method was demonstrated with a diffusive sampler for water vapor by comparing extrapolated concentrations of water vapor with concentrations measured with a dew-point hygrometer.
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