A very thick film open-tubular trap for headspace capillary gas chromatography

An open-tubular trap with a very thick film was studied for "full on-line" headspace capillary gas chromatography, and was used as an enrichment trap for headspace sampling. The preparation of the open-tubular column with up to an 80 mu m thick film, by combining both static and dynamic coating, is described in detail. The breakthrough volume for the open-tubular trap of d ifferent film thickness, as the loading capacity for HS sampling, does not increase linearly in proportion to the film thickness. A study of the diffe rence between a packed adsorbent trap and an open-tubular trap shows that H S capillary GC with open-tubular trap loses less of the retention capacity, has better resolution ability and higher recovery. By independently and ra pidly heating the open-tubular trap, the GC peaks may have higher resolutio n. Examples of successful analyses, by the open-tubular trap with "full on- line" HS capillary GC, include trace aromatic hydrocarbon (1 ppm-100 ppm) i n polybutadiene-styrene rubber and trace alcohol and acrylic esters (10 ppm -1000 ppm) in polyacrylate hydrous emulsion.