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- Title
Comparison of seasonality of urban grime in three southern Ontario cities.
- Authors
Huang, Yao Yan; McLay, Emma M.; Donaldson, D. James
- Abstract
Urban grime refers to films made of a complex chemical mixture of organics and inorganics deposited on outdoor surfaces. The specific chemical composition of such films can vary considerably due to geographic and seasonal influences. We compared the seasonal change of grime's water-soluble inorganic ion content in a rural (Thamesford), suburban (Oshawa), and urban city (Toronto) in southern Ontario, Canada. Sodium, calcium, chloride, nitrate, and sulfate amounts in grime were collected and quantified over four seasons in Oshawa, ON and Thamesford, ON and compared with results from a previous study in Toronto to elucidate differences. We found that all three regions displayed a clear seasonality in sodium and chloride consistent with winter road salt inputs and chloride loss in summer. Mole fractions of sulfate were consistently the lowest of the measured ions, and NO3−/SO42− ratios showed a winter–spring minimum and summer–fall maximum. Urban–rural differences in the seasonal changes of ionic mole ratios suggest that additional chloride displacement by nitrate occurs within grime in Toronto that is not present in the two other rural/suburban cities in the same region.
- Subjects
ONTARIO; TORONTO (Ont.); OSHAWA (Ont.); CITIES &; towns; SALT; RURAL-urban differences; MOLE fraction; SEASONS
- Publication
Canadian Journal of Chemistry, 2024, Vol 102, Issue 3, p164
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2023-0143