Abstract
A method is described for monitoring the concentration of a volatile organic compound dissolved in an aqueous medium. A thin rubber membrane is mounted so that one surface is in contact with the solution to be monitored. A stream of gas passing over the other surface delivers the volatile material that has permeated the membrane to a sensitive gas chromatography detector. The response of the membrane-detector system is proportional to the concentration of organic materials in the water. The permeability of different membranes to different compounds varies offering a degree of selectivity. The membrane-gas detector has been used as an intravascular sampling device for monitoring the changes in the blood concentrations of volatile organic compounds injected as tracers.
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