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PW02 Atmospheric Chemistry
(PW021) Variability and Reproducibility of Surface Films on Impervious Urban Surfaces.
Hernandez, N1, Diamond, M1, Truong, J1, Donaldson, J1, 1 University of Toronto, Toronto, Ontario, Canada
ABSTRACT- Films develop on impervious urban surfaces, such as windows, are composed of atmospherically-derived compounds. Here we explore variability due to seasonal and experimental factors on chemical concentrations found in the film. Polycyclic aromatic hydrocarbons (PAH), n-alkanes, monocarboxylic acids, metals, and sulphates/nitrates were quantified by sampling window films at the University of Toronto on a monthly basis in 2002 and on adjacent windows in 2004. Film concentrations of both organic and inorganic compounds were relatively consistent month-to-month. The coefficients of variation fluctuate from 0.3 to 0.5 for all compounds analyzed indicating similar behavior of these compounds in the film. Sampling and experimental variability were tested by comparing the concentrations of PAH and sulphates/nitrates between adjacent window films exposed to the same meteorological conditions. Results indicate that sample variability and reproducibility is relatively small, with PAH being slightly more variable than sulphate/nitrate.
Key words: surface films
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