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Case Study Terpenes analysis

Case Study Terpenes analysis
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Case Study N°AA5 – Ambient air monitoring – Terpenes – updated: 19.10.15 Case Study Ambient Air Monitoring Applications Low level measurement of VOCs and Terpenes close to the sea and the Landes Forest Context & Challenges It has been established that organic aerosol (OA) makes up for a major fraction of fine particulate matter in all region of the atmosphere. This fraction accounts approximately for half of the total PM2.5 dry mass. 1,2 Primary OA is directly emitted in the troposphere from anthropological and natural sources whereas secondary OA (SOA) is formed in-situ in the atmosphere from the oxidation of biogenic or anthropogenic gasphase precursors and subsequent partitioning of the less volatile products into the particle phase. The current number is that, on a global scale, SOA would represent around 60% of the overall OA.3 However, recent global mass-balance estimations for the removal of volatile organic compounds (VOC) suggest that this number could under-predicts SOA production.4 Recent field measurements in urban locations are also in support of a larger share, indicating that SOA is the dominant fraction of OA, with amounts considerably 20 greater than models predictions. Chromatotec® Solutions Chromatotec® proposes its airmoVOC C6-C12 analyzer dedicated to VOCs including Terpenes measurement (alpha-pinene / beta-pinene/ myrcene / 3-carene / limonene) at very low concentration (low ppt). airmoVOC C6-C12 in ppt configuration Trap configuration with thermodesorption Sampling volume: 400 mL can be increased for higher sensitivity Unbreakable metallic column with temperature gradient Flame Ionisation Detector (FID) Automatic results validation & calibration with embedded permeation tube. sales@chromatotec.com www.chromatotec.com 1. Kanakidou et al. Atmos. Chem. Phys., 5 2005 2. Haddad et al. Atmos. Chem. Phys. Discuss., 2010 3. Kanakidou et al., Atmos. Chem. Phys., 2005 4. Goldstein and Galbally, Environ. Sci. Technol., 2007

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Case Study N°AA5 – Ambient air monitoring – Terpenes – updated: 19.10.15 On the above results, it can clearly be established that Benzene is not the main source of pollution near the Landes Forest. Terpenes concentrations are much higher. Therefore, it becomes interesting to monitor such compounds at low and very low concentration levels (ppb or ppt). RESULTS FOR TERPENES AND BENZENE MEASUREMENT In opposition to other analytical technologies, our systems allow the speciation of each compound for a better accuracy. It is then possible to combine all the results to get a Total Terpenes...

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