title: Measurement of spatial and temporal variation in volatile hazardous air pollutants in Tacoma, Washington, using a mobile membrane introduction mass spectrometry (MIMS) system.
abstract: The objective of this study was to use membrane introduction mass spectrometry (MIMS), implemented on a mobile platform, in order to provide real-time, fine-scale, temporally and spatially resolved measurements of several hazardous air pollutants. This work is important because there is now substantial evidence that fine-scale spatial and temporal variations of air pollutant concentrations are important determinants of exposure to air pollution and adverse health outcomes. The study took place in Tacoma, WA during periods of impaired air quality in the winter and summer of 2008 and 2009. Levels of fine particles were higher in winter compared to summer, and were spatially uniform across the study area. Concentrations of vapor phase pollutants measured by membrane introduction mass spectrometry (MIMS), notably benzene and toluene, had relatively uniform spatial distributions at night, but exhibited substantial spatial variation during the day-daytime levels were up to 3-fold higher at traffic-impacted locations compared to a reference site. Although no direct side-by-side comparison was made between the MIMS system and traditional fixed site monitors, the MIMS system typically reported higher concentrations of specific VOCs, particularly benzene, ethylbenzene and naphthalene, compared to annual average concentrations obtained from SUMA canisters and gas chromatographic analysis at the fixed sites.
authors: a Department of Chemistry , University of Victoria , Victoria , British Columbia , Canada.
authors: Nicholas G
authors: NG
authors: Davey
authors: Cole T E
authors: CT
authors: Fitzpatrick
authors: Jacob M
authors: JM
authors: Etzkorn
authors: Morten
authors: M
authors: Martinsen
authors: Robert S
authors: RS
authors: Crampton
authors: Gretchen D
authors: GD
authors: Onstad
authors: Timothy V
authors: TV
authors: Larson
authors: Michael G
authors: MG
authors: Yost
authors: Erik T
authors: ET
authors: Krogh
authors: Michael
authors: M
authors: Gilroy
authors: Kathy H
authors: KH
authors: Himes
authors: Erik T
authors: ET
authors: Saganić
authors: Christopher D
authors: CD
authors: Simpson
authors: Christopher G
authors: CG
authors: Gill
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D015386:Hazardous Substances / Q000032:analysis*; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D055549:Volatile Organic Compounds / Q000032:analysis*; D014861:Washington
chemical_list: D000393:Air Pollutants; D015386:Hazardous Substances; D055549:Volatile Organic Compounds
keywords: Air toxics; MIMS; MS/MS; diesel exhaust; exposure assessment; field portable tandem mass spectrometry; membrane inlet mass spectrometry; membrane introduction mass spectrometry; woodsmoke