Composition and concentrations of semi-volatile hydrocarbons. Final report
Nonmethane hydrocarbons (NMHC) in ambient air are routinely analyzed for C2 to C10 species. The Caldecott Tunnel, located in the San Francisco area, was selected as a site dominated by motor vehicle emissions. The remaining sampling sites were: Los Angeles as a typical urban site, and Oildale as a site dominated by oil production. Whole air samples, analyzed for C2 through C12 hydrocarbons, were collected using the stainless steel canisters. Semi-volatile hydrocarbons, in the range of C8 to C18, were collected using Tenax-TA solid adsorbent. The samples were analyzed using high resolution gas chromatographic separation and Fourier transform infrared/mass spectrometric detection (GC/IRD/MSD) or flame ionization detection (FID) of individual hydrocarbons. The comparison of hydrocarbon concentrations found in the Tenax and canister samples and the assessment of the levels of semivolatile hydrocarbons (C10-C18 range) relative to total non-methane hydrocarbons (C2-C10 or C2-C12), as measured by the canister method, is presented. The results showed that the percent contribution of SVHC to TNMHC ranged from approximately 1 to approximately 18% depending on the carbon number arbitrarily selected as a starting point of SVHC range.
- Research Organization:
- Nevada Univ., Reno, NV (United States). Energy and Environmental Engineering Center
- OSTI ID:
- 6246475
- Report Number(s):
- PB-93-210276/XAB; CNN: ARB-A032-130
- Resource Relation:
- Other Information: See also PB--89-122287
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROCARBONS
CHEMICAL PROPERTIES
ECOLOGICAL CONCENTRATION
AIR POLLUTION MONITORING
CALIFORNIA
CARBON
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COMBUSTION PRODUCTS
EXHAUST GASES
GASEOUS WASTES
INDUSTRIAL WASTES
IONIZATION
LOS ANGELES
OILS
SAMPLING
SEPARATION PROCESSES
SPECTROMETERS
STATISTICAL DATA
SURVEYS
TUNNELS
URBAN AREAS
VEHICLES
DATA
DEVELOPED COUNTRIES
ELEMENTS
FLUIDS
GASES
INFORMATION
MEASURING INSTRUMENTS
MONITORING
NONMETALS
NORTH AMERICA
NUMERICAL DATA
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
UNDERGROUND FACILITIES
USA
WASTES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)