Introduction:

This method is suitable for determining the residual levels of benzene derivatives and refrigerants in the air of workplaces, production workshops, and other environments.

Method principle:

Inject the gas sample automatically into a gas chromatograph equipped with a hydrogen flame ionization detector, and measure the content of each component on dedicated columns for benzene derivatives and refrigerants through selection valves.

Reagents and materials:

Standard gases: Benzene -0.0994mg/m3, Toluene -0.0968mg/m3, p-xylene -0.2030mg/m3, o-xylene -0.1000mg/m3, dichloromethane 1.0200mg/m3, pentafluoroethane-1.0400mg/m3, 1.1.1.2-Tetrafluoroethane-1.0300mg/m3, difluorochloromethane -1.0200mg/m3.

Gas source: nitrogen (purity ≥ 99.999%), hydrogen (purity ≥ 99.999%), compressed air;

Standard gas dilution gas: N2, purity ≥ 99.999%

Instruments and equipment:

Gas chromatograph: Jing and AnalyElf PG6 online version (GC-FID)

Sample injector: Two position rotary valve (1ml sample quantification ring)

Chromatography column: benzene series/refrigerant special sleeve column

Data workstation: 3097 online version.