Abstract
The construction of a gas purge system for measurement of sorption kinetics is described in detail. The system features continuous monitoring of a gas-phase organic compounds using a photoionization detector, both open and closed modes of operation, and a convenient flask-switching design. Detector response was found to be adversely affected by small fluctuations in gas flow rate and by electrical interference from the temperature control system. Modification of the initial design incorporated flow control within the detector loop and uses a proportional temperature controller. Dynamic measurements of Henry`s Law constants in the gas purge system are reproducible and agree with literature values for most of the organic compounds tested. 22 refs., 4 figs., 2 tabs.
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