CRYOGEN-FREE AUTOMATED GAS-CHROMATOGRAPH SYSTEM FOR MONITORING OF HALOCARBONS IN THE ATMOSPHERE AT BACKGROUND CONCENTRATION LEVELS

Citation
S. Toyoda et al., CRYOGEN-FREE AUTOMATED GAS-CHROMATOGRAPH SYSTEM FOR MONITORING OF HALOCARBONS IN THE ATMOSPHERE AT BACKGROUND CONCENTRATION LEVELS, Analytical sciences, 14(5), 1998, pp. 917-923
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
0910-6340
Volume
14
Issue
5
Year of publication
1998
Pages
917 - 923
Database
ISI
SICI code
0910-6340(1998)14:5<917:CAGSFM>2.0.ZU;2-M
Abstract
An automated gas chromatograph/electron capture detector (GC/ECD) syst em is developed for the monitoring of major seven halocarbons in the a tmosphere (CCl2F2: CFC-12, CCl3F: CFC-11, CCl2FCClF2: CFC-113, CH3CCl3 , CCl4, CHCl=CCl2, and CCl2=CCl2) at the tropospheric background conce ntration levels. By using two columns in series for each of two groups divided by the volatility of the compounds, the system requires neith er cryogen for preconcentration nor any physical/chemical dryer for wa ter removing. A sample amount of ca. 18 ml STP is sufficient to detect these species, and analysis of sub-ambient atmospheric-pressure sampl e in a canister is also possible. Monitoring of these halocarbon conce ntrations was carried out at 90-min intervals in the urban area.