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Characterisation of polymer-coated glass (POGs) as passive air samplers for persistent organic pollutants.

Harner, Tom and Farrar, Nick and Shoeib, Mahiba and Jones, Kevin C. and Gobas, Frank A. P. C. (2003) Characterisation of polymer-coated glass (POGs) as passive air samplers for persistent organic pollutants. Environmental Science & Technology, 37 (11). pp. 2486-2493. ISSN 0013-936X

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Abstract

The use of thin-film polymer-coated glass surfaces or POGs as passive air samplers was investigated during an uptake experiment in an indoor environment with high levels of gas-phase polychlorinated biphenyls (PCBs). POGs consisted of a micron thick layer of ethylene vinyl acetate (EVA) coated onto glass cylinders. The uptake was initially linear with time and governed by the air-side mass transfer coefficient and surface area of the sampler. This was followed by a curvilinear region and finally a constant phase when equilibrium was established between air and EVA. The high surface area-to-volume ratio of the POGs allowed rapid equilibrium with gas-phase PCBs; equilibration times were on the order of hours for the low molecular weight congeners. The equilibrium concentration was dependent on the EVA-air partition coefficient, KEVA-A, which was shown to be very well correlated to the octanol−air partition coefficient, KOA. When POGs of varying thickness were equilibrated with air, the amount of PCB accumulated increased with increasing thickness of the EVA, indicating that uptake was by absorption into the entire polymer matrix. A wind field of 4 m s-1 resulted in an increased uptake rate by a factor of approximately six compared to uptake in relatively still air. This wind speed effect was diminished, however, when POGs were housed in deployment chambers consisting of inverted stainless steel bowls. Relationships based on the air-side mass transfer coefficient and KEVA-A were developed for PCBs that describe the entire uptake profile and allow air concentrations to be determined from the amount of chemical accumulated in the POG. It is believed that these relationships are also valid when POGs are used to detect other classes of persistent organic pollutants.

Item Type: Article
Journal or Publication Title: Environmental Science & Technology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21392
Deposited By: ep_ss_importer
Deposited On: 13 Jan 2009 09:37
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:46
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21392

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