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Gas-particle partitioning of atmospheric PCDD/Fs : measurements and observations on modelling.

Research output: Contribution to journalJournal article

Published

Journal publication date15/10/1999
JournalEnvironmental Science and Technology
Journal number20
Volume33
Number of pages9
Pages3596-3604
Original languageEnglish

Abstract

Subscriber access provided by Lancaster University Library ACS Journals C&EN CAS Journals A–Z Books|Authors & Reviewers|Librarians|ACS Members|About Us|e-Alerts|Help Quick Search Advanced Search Environ. Sci. Technol. All Journals/Website Personalize your experience: Log In | Register | Cart Home Browse the JournalList of Issues Current Issue Most Read Articles Most Cited Articles Sample Issue Author Index Cover Catalog Just Published Current Issue Online NewsLatest News News Archive MultimediaMultimedia Index Submission & ReviewOverview ACS Paragon Plus Environment Ethical Guidelines [PDF] Copyright & Permissions/Rightslink ACS Author & Reviewer Resource Center Subscriptions About the JournalAbout the Journal Editors Editor Profile News & Features Staff Masthead [PDF] Advertising Prev. Article Next Article Table of Contents ArticleGas−Particle Partitioning of Atmospheric PCDD/Fs: Measurements and Observations on Modeling AbstractFull Text HTMLHi-Res PDF[113 KB]Robert G. M. Lee* and Kevin C. Jones Department of Environmental Science, Institute of Environmental and Natural Sciences, Lancaster University, Lancaster LA1 4YQ, U.K. Environ. Sci. Technol., 1999, 33 (20), pp 3596–3604 DOI: 10.1021/es980994h Publication Date (Web): September 10, 1999 Copyright © 1999 American Chemical Society * Telephone: (+44 1524) 592578, Fax: (+44 1524) 593985; e-mail: r.g.lee@lancaster.ac.uk. AbstractThe gas−particle partitioning of 2−8PCDD/Fs in ambient air was investigated at a semirural U.K. site, sampled with glass microfiber filters (GFFs) and polyurethane foam (PUF) plugs, and quantified by HRGC−HRMS. Nine samples, each 1000 m3 of air, were collected over different periods of 7 days between May and Aug, when the average ambient temperatures varied between 12 and 17 °C for the different sampling periods. The proportion of the different homologues associated with the PUF plugs (i.e., operationally defined as the gas phase) varied greatly. 2CDFs were almost exclusively (>99.5%) in the gas phase, along with 82−96% of the 4CDD/Fs, 15−65% of the 6CDD/Fs, and 2−20% of the 8CDD/Fs. PCDFs tended to be slightly more associated with the gas phase than the equivalent homologue group of the PCDDs. Plots of the log partitioning coefficient (Kp) versus the log subcooled liquid vapor pressure ( ) gave slopes in the range −0.64 to −0.79 (x̄, −0.68) and intercepts of −6.49 to −7.32 (x̄, −6.73) for the homologue groups. The data set was used to compare the Junge−Pankow adsorptive gas−particle distribution model and a parametrization of Pankow's absorption model by Harner and Bidleman. Although uncertainties remain over the physicochemical property data reported for PCDD/Fs, the former overpredicted the proportion of PCDD/Fs found associated with the particulate phase by between a factor of 1.1 and 5. The latter gave better agreement, to within a factor of 1.2−1.5, despite the requirement to use calculated rather than measured values for the octanol:air partition coefficient (Koa).