Gas/solid partitioning of semivolatile organic compounds (SOCs) to air filters. 2. Partitioning of polychlorinated dibenzodioxins,polychlorinated dibenzofurans,and polycyclic aromatic hydrocarbons to quartz fiber filters |
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| Institution: | 1. Resident, Department of Conservative Dentistry, Wonju Severance Christian Hospital, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea;2. Assistant Professor, Department of Orthodontics, Wonju Severance Christian Hospital, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea;3. Professor, Department of Conservative Dentistry, Gangnam Severance Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea;4. Professor, Department of Conservative Dentistry, Wonju Severance Christian Hospital, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea;5. Research Professor, Institute of Lifestyle Medicine, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea;6. Associate Professor, Department of Conservative Dentistry, Wonju Severance Christian Hospital, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea;1. Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Zahnklinik 1 – Zahnerhaltung und Parodontologie, Forschungslabor für dentale Biomaterialien, Glueckstraße 11, 91054 Erlangen, Germany;2. Department of Restorative Dentistry, Faculty of Dentistry, University of Concepción, Concepción, Chile;1. Nanfang Hospital, Southern Medical University, Guangzhou 510515, China;2. Department of Stomatology, Naval General Hospital of PLA, Beijing 100048, China;3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;1. University College Dublin, School of Civil, Structural and Environmental Engineering, Newstead Building, Belfield, Dublin 4, Ireland;2. Monash University, Department of Civil Engineering, Clayton Campus, Victoria 3800, Australia;1. Department of Occlusion and Removable Prosthodontics, Okayama University, 2-5-1 Shikata-cho, kita-ku, Okayama 700-8525, Japan;2. Center for Innovative Clinical Medicine, Okayama University Hospital, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan;3. Department of Occlusal and Oral Functional Rehabilitation, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan;4. Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8525, Japan |
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| Abstract: | Gas/particle distributions of atmospheric semi-volatile organic compounds (SOCs) are often measured using filter/sorbent samplers. Unfortunately, the adsorption of gaseous SOCs onto a filter can cause positive biases in the measured particle-phase concentrations, and negative biases in the measured gas-phase concentrations. When quartz fiber filters (QFFs) are used, surface-area-normalized gas/quartz partition coefficient (Kp,s, m3 m?2) values will be useful when estimating the magnitudes of these errors. Gas/QFF Kp,s values have been reported in the literature only for polycyclic aromatic hydrocarbons (PAHs) and n-alkanes. Gas/QFF Kp,s values were measured here for a series of polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), and also for a range of PAHs. Within each of the three individual compound classes, plots of log Kp,s vs. log pLo (sub-cooled liquid vapor pressure) were found to be linear with slopes of approximately ?1. At relative humidity (RH)=25%, the pooled log Kp,s data at 25°C for the three compound classes were correlated with log pLo nearly as well (r2=0.95) as were the data for the individual compound classes (r2≈0.97). In general, the Kp,s values for the PAHs and PCDD/PCDFs studied were found to be about a factor of 2 larger for partitioning to clean QFFs at RH=25% than for TMFs at RH=21–52%. Backup QFFs used in filter/sorbent sampling in a suburban area yielded Kp,s values for PAHs at RH=37% that were significantly lower than for clean QFFs at the same RH. (This may have been the result of the adsorption of ambient organic compounds that at least partially blocked the direct adsorption of the SOCs to the QFF surface). Therefore, when QFFs are used to separate atmospheric gas- and particle-phase SOCs, corrections for compound-dependent gas adsorption artifacts for QFFs may need to be carried out using Kp,s values that were obtained with ambient backup QFFs. |
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