| 摘要 |
FIELD: analytic instrumentation engineering; applicable in monitoring of content of harmful impurities of volatile organic and inorganic substances in atmospheric air. SUBSTANCE: gas chromatograph for analysis of substances in mixtures of gases and/or vapors contains source of carrier gas, device for introduction of samples of analyzed mixture of substances. The latter device has a length of tube with metering internal volume, whose one end is connected by means of pipeline with source of carrier gas and with pipeline for supply of mixture of substance to be analyzed, chromatographic column connected with the second end of tube with metering internal volume, stimulator of gas flow connected with the second end of tube, and detector connected with column outlet in which additional pipeline is introduced for supply of carrier gas. Additional pipeline connects the source of carrier gas with one of the ends of chromatographic column, and, at least, three limiters of gas flow, one of which is installed in pipeline connecting the source of carrier gas with one end of chromatographic column, the second limiter is installed in pipeline for supply of mixture to be analyzed, and the third limiter is installed at the outlet of flow stimulator. EFFECT: provision of exclusion of contact of the mixture to be analyzed during mixture passage to chromatographic column with some switching-over devices, exclusion of nonblown-through volumes on the path of flow of carrier gas to chromatographic column, and provision of cleaning of initial volumes of chromatograph from remains of substance of sample prior to each new sample. |
