Trace Gas Chromatographic Techniques Below The Part-Per-Billion Level

Continuous aerodispersive enrichment unit for trace determination of pollutants in air

“…The absorption of the analyte in the droplets of the aerosol, taking place at the same time, is characterized by the relationship given in eq 2. The distribution of the analyte mass in the gas-aerosol system can be characterized by the relationship QiG°= QiL + QiAL + QiG (5) In this relationship, QiG°i s the amount of the analyte in the volume VG of the gas phase prior to its contact with the aerosol of the sorbing medium, QiAL is the amount of the analyte adsorbed on the surface of aerosol aggregates, and QiG is the amount of the analyte in the gas phase after contact with the aerosol.…”

“…The capillary is connected to a reservoir of the absorption medium. The stainless tube ( 1) is provided with a suction inlet for the gas (5). The front face is inserted in a glass cylinder (4) whose inside surface was made hydrophobic by silanization.…”

“…K, = 103; (4) K, = 104; (5) Zf, = 10s; (6) K, = 10®. 1000, when the magnitude of the concentration degree within the range of uG/uL = (5-0.5) X 104 comes close to the magnitude of the distribution constant.…”