Gas chromatographic determination of acetonitrile in air using a thermionic detector
- Max-Planck-Institut fuer Chemie, Mainz (West Germany)
A gas chromatographic procedure for the determination of acetonitrile (CH{sub 3}CN) in air is described, based on a thermionic nitrogen-selective detector. The lower limit of detection is 15 pg of CH{sub 3}CN for a blank value of 5.0 {plus minus} 3.2 pg. The method involves the collection of air in 2-dm{sup 3} vessels (glass or stainless steel) and preconcentration of acetonitrile by cryogenic trapping. Preconcentration by sorption on modified Chromosorb 102 was found unsuitable due to undesirable memory effects. Air samples stored in containers for periods longer than 3 days generally show a rise in CH{sub 3}CN concentration, so that air samples must be processed within a few days. precautions against contamination in the gas handling system or by intrusion of laboratory air also are important. Calibration tests based on gaseous and liquid dilution series lead to comparable accuracies of about 4% in each case but a better reproducibility for liquid calibration mixtures.
- OSTI ID:
- 6406628
- Journal Information:
- Analytical Chemistry (Washington); (USA), Journal Name: Analytical Chemistry (Washington); (USA) Vol. 62:17; ISSN 0003-2700; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102 -- Chemical & Spectral Procedures
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACETONITRILE
AIR
AIR POLLUTION
CHROMATOGRAPHY
DETECTION
FLUIDS
GAS CHROMATOGRAPHY
GASES
MEASURING METHODS
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POLLUTION
SEPARATION PROCESSES
THERMIONICS