|
1I - Physicochemical properties (MOP/54) Measurements of temperature dependent film/air partition coefficients for POPs. Skinner, Andrew1, Harner, Tom2, Jones, Kevin 1, 1 Lancaster University - Environmental Science, Lancaster, Lancashire, U.K.2 Environment Canada - MSC, Toronto, Ontario, Canada ABSTRACT- In recent field investigations, polymer coated glass surfaces (POGs) have been employed as passive air samplers to assess air concentrations and patterns of persistent organic pollutants (POPs). POGs consist of a thin film of ethylene vinyl acetate (eva, 0.1 to 1 micron thick) coated onto glass. The extremely high surface area to volume ratio of these samplers allows them to equilibrate fairly rapidly (hours to days) with ambient POPs. In order to use these samplers semi-quantitatively, to back-calculate air concentrations, it is essential to know the film-air partition coefficient (Keva/air) and how it varies with temperature. In this study, Keva/air values were measured in a controlled chamber for approximately 30 POPs (PCBs, OC pesticides and PAHs) over the temperature range +5 to +35 C. Values of Keva/air showed a strong temperature dependence and were very well correlated to the octanol/air partition coefficient (Koa). This relationship allows Keva/air values to be determined for other POPs for which Koa is known. Key words: Partition Coefficient (Koa), Passive air samplers, Polymer coated glass (POGs), Ethylene vinyl acetate (eva) |
