Scavenging trap for solid sample and its application

Abstract

The invention relates to gas chromatographic analysis that is a solid sample swept catcher and the application in atmosphere phase chromatogram. The inlet of triple valve is connected to carrier gas air supply, and the other two are seperately connected to the inlet of resolver and the inlet of vaporizing chamber; the outlet end of resolver is connect to the sample end of vaporizing chamber; vaporizing chamber is connected to detector by chromatographic column; the outlet of vaporizing chamber carries diverter; heater is set on resolver; the CO2 cold spout is sweeping on the chapiter of chromatographic column of CO2 area refrigeration source; the resolver is stainless steel tube, and inlet end connects to triple valve by thereof copper tube, a outlet end is connected to a pinhead, which is inserted into vaporizing chamber. The invention captures on the chapiter of chromatographic column, and the resolution of each co constituent could take synchronization with chromatographic analysis process, and needn't auxiliary heating. Thus, it could obtain wonderful fixed quantity and separating effect.

Description

technical field [0001] The invention relates to gas chromatographic analysis, in particular to a solid sample purge trap and its application in gas chromatograph. Background technique [0002] Gas chromatography plays an important role in the analysis of organic matter due to its advantages of high sensitivity, high resolution, fast analysis, cheap instrument and easy operation. Volatile organic compounds (VOCs) and semi-volatile organic compounds are widely present in air, water and food, and have a serious impact on human health and the ecological environment [Document 1: Wang J L, Chen W L, J Chromatogr A, 2001, 927: 143 ]. Due to the low concentration of volatile and semi-volatile organic compounds in environmental monitoring and food, generally at the level of ng / L to μg / L, samples must be pretreated before analysis and detection. Common pretreatment methods include purge and trap, static headspace, solid-phase extraction, solid-phase microextraction, supercritical fl...

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Problems solved by technology

[0006] The purge and trap method is also called cryogenic trapping [Document 5: Ceulemans M, Adams F C.J Anal AtSpectrom, 1996, 11: 201-206; Document 6: Jo-Anne A Jackson, William R Blair, Frederick E Brickman, Warren P Iverson.Environ Sci Technol, 1982, 16 (2): 110-119], so a large amount of water or solvent will be trapped at the same time, often causing the impact on chromatographic separation and quantification [Document 7: Canac-Arteaga D, Viallon C, Berdague J L, Analusis, 1999.27 (9): 780; Literature 8: Canac-Arteaga D, Viallon C, Berdague J L, Analusis, 2000.28: 550], and the cold trap equipment uses semiconductor, liquid nitrogen or liquid CO 2 , resulting in high cost, complicated operation, time-consuming and laborious

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