title: Volatile organic compound measurements in the California/Mexico border region during SCOS97.
abstract: Measurements of volatile organic compounds (VOC) were carried out in the California/Mexico border region during the Southern California Ozone Study in the summer of 1997 (SCOS97). Integrated 3-h samples were collected in Rosarito (south of Tijuana, Mexico) and in Mexicali during intensive operational periods (IOP), twice per IOP day. VOC were collected using stainless-steel 6-1 canisters; carbonyl compounds were collected using 2,4-dinitrophenyl-hydrazine (DNPH) impregnated C18 SepPak cartridges. The canister samples were analyzed for speciated volatile hydrocarbons (C2-C12), CO, CO2, CH4, methyl t-butyl ether (MTBE), and halogenated hydrocarbons. DNPH-impregnated cartridges were analyzed for 14 C1-C7 carbonyl compounds. The concentrations of all species were higher at Mexicali than in Rosarito. A good correlation between total non-methane hydrocarbons (TNMHC), CO, and other pollutants associated with motor vehicle emissions observed for Mexicali indicates that the main source of TNMHC at this site is vehicular traffic.
authors.affiliation: Desert Research Institute, Reno, NV 89512, USA. barbz@dri.edu
authors.forename: B
authors.initials: B
authors.lastname: Zielinska
authors.forename: J
authors.initials: J
authors.lastname: Sagebiel
authors.forename: G
authors.initials: G
authors.lastname: Harshfield
authors.forename: R
authors.initials: R
authors.lastname: Pasek
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D002140:California; D004784:Environmental Monitoring; D006801:Humans; D006838:Hydrocarbons / Q000032:analysis; D008800:Mexico; D009930:Organic Chemicals / Q000032:analysis; D001335:Vehicle Emissions / Q000032:analysis*; D014835:Volatilization
chemical_list: D006838:Hydrocarbons; D009930:Organic Chemicals; D001335:Vehicle Emissions