Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Atmospheric gaseous elemental mercury in downtown Toronto
AbstractContinuous measurements of gaseous elemental mercury (GEM) in downtown Toronto were conducted from June 2001–February 2002. Ambient air was sampled at 3.5 and 7m above ground in a canopy over a sidewalk. The quarter hourly mean concentrations were found at 2.39±2.05ngm−3 (N=10,658) for the lower sampling level, and 2.57±2.39ngm−3 (N=10,628) for the upper sampling level. The average of both sampling levels (2.48ngm−3) was 60% higher than the average of Canadian background emission (1.55ngm−3, Alert). Seasonal concentrations showed the effects of the temperature on the volatilization of Hg0. Higher GEM was found in the summer time (20 June–19 September) at 3.03±2.13ngm−3 (lower level) and 3.31±2.56ngm−3 (upper level) while lower values were observed in the fall (20 September–19 December) at 1.84±0.87ngm−3 (lower level) and 1.97±1.38ngm−3 (upper level). Log normal probability distribution of the GEM concentration was verified and the double peak hourly average diurnal distribution of GEM concentration was observed in our study.
Atmospheric gaseous elemental mercury in downtown Toronto
AbstractContinuous measurements of gaseous elemental mercury (GEM) in downtown Toronto were conducted from June 2001–February 2002. Ambient air was sampled at 3.5 and 7m above ground in a canopy over a sidewalk. The quarter hourly mean concentrations were found at 2.39±2.05ngm−3 (N=10,658) for the lower sampling level, and 2.57±2.39ngm−3 (N=10,628) for the upper sampling level. The average of both sampling levels (2.48ngm−3) was 60% higher than the average of Canadian background emission (1.55ngm−3, Alert). Seasonal concentrations showed the effects of the temperature on the volatilization of Hg0. Higher GEM was found in the summer time (20 June–19 September) at 3.03±2.13ngm−3 (lower level) and 3.31±2.56ngm−3 (upper level) while lower values were observed in the fall (20 September–19 December) at 1.84±0.87ngm−3 (lower level) and 1.97±1.38ngm−3 (upper level). Log normal probability distribution of the GEM concentration was verified and the double peak hourly average diurnal distribution of GEM concentration was observed in our study.
Atmospheric gaseous elemental mercury in downtown Toronto
Denis, Monique St. (Autor:in) / Song, Xinjie (Autor:in) / Lu, Julia Y. (Autor:in) / Feng, Xinbin (Autor:in)
Atmospheric Environment ; 40 ; 4016-4024
04.07.2005
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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