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to over 300°C. With high-temperature operation, thermal decomposition is a problem; however, compounds which have sufficient thermal stability to permit separation by GC do not generally decompose in the inlet system. Spectra of volatile material at the 5 to 10 p.p.m. concentration can readily be obtained using the conventional 20-to 50-µ1. GC sample.The minimum volume design of the manifold gives resolution in the manifold comparable to that indicated by the GC detector.Constant usage has demonstrated that the inlet system is free of maintenance problems and is applicable to a large number of organic materials. ACKNOWLEDGMENTThe author acknowledges the helpful suggestions of Eugene W. Bassett and James Farley and thanks John Kraus for the excellent job in constructing the manifold.

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