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Construction and Performance of a Gas Purge System

Dep. Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824-1325;
Dep. Soil Science, Univ. of Florida, Gainesville, FL 32611-0151.

^* Corresponding author.

ABSTRACT

The construction of a gas purge system for measurement of sorption kinetics is described in detail. The system features continuous monitoring of 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 incorporates 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.

(current address of T.R. Benzing: College of Integrated Science and Technology, James Madison Univ., Harrisonburg, VA 22807)

Received for publication August 3, 1995.