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Aircraft Measurements of Highly Reactive Volatile Organic Compounds Using Proton Transfer Reaction Mass Spectrometry (PTR-MS) During TexAQS II
| Project Period: | 12/15/2004 - 08/31/2005 |
| Total Budget: | $261,500 |
| Sub-Contractors: | Texas A&M University - Renyi Zhang ($261,500)
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Results from the 2000 Texas Air Quality Study (TexAQS) have unambiguously established that highly reactive volatile organic compounds (HRVOCs) from petrochemical industrial sources are linked to rapid and efficient photochemical ozone production in the Houston Galveston area [e.g., Daum et al., 2003]. In particular, lower molecular weight alkenes such as ethylene, propylene, and butenes are identified to be most abundant inside petrochemical source plumes and dominate the reactivity of VOCs [Daum et al., 2003; Reyson et al., 2003; Berkowitz et al., 2004]. Those field measurements also indicate that measurement-inferred emissions of the lighter alkenes are substantially higher than reported by current inventories [Karl et al., 2003; Reyson et al., 2003; Wert et al., 2003]. Hence one of the most critical elements to quantify ozone formation in photochemical models and to implement SIP for cost-effective ozone control strategies lies in better assessments of the emission sources and inventories of HRVOCs from the industrial sources. Recent work at Texas A&M has extended the PTR-MS operation for detection of both organic and inorganic compounds using an ion drift-chemical ionization mass spectrometry (ID-CIMS) [Fortner et al., 2004]. The ID-CIMS instrument has been successfully deployed inside a trailer on an Aldine site in Houston during the summer 2004, supported by HARC (H25).
Therefore, a commercial aircraft version of PTR-MS (Ionicon Analytik Ges.m.b.H, Innsbruck, AUSTRIA) will be used for measurements of pre-selected HRVOCs.
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| Page Updated/Reviewed: 05/24/2006 1:10 PM |
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