Headspace Gas Chromatography Method for Studies of Reaction and Permeation of Volatile Agents with Solid Materials.

摘要

An analytical chemistry method is described for measuring the reactivity and permeability of fabrics, films, and other solid materials. Headspace gas chromatography (GC) or GC mass spectrometry instrumentation is used. A vial-in-vial method is used, in which the volatile agent is placed in a small inner vial, and the inner vial is capped with a layer of fabric or film to be tested. The agent permeates from the inner vial into an outer headspace vial. The instrument samples the vapor in the outer vial by sampling it and injecting it into the GC for analysis. The presence of agent in the outer vial indicates that it has permeated through the film. Multiple sampling can be used to determine time dependence. Solids can also be used in the headspace vial without the inner vial.