Issue 3, 2009

Annual atmospheric mercury species in Downtown Toronto, Canada

Abstract

Real-time concentrations of atmospheric gaseous elemental mercury (GEM), reactive gaseous mercury (RGM), and mercury associated with particles having sizes <2.5 µm (P–Hg < 2.5) were simultaneously measured in downtown Toronto from December 2003 to November 2004. The annual mean concentrations of GEM, P–Hg < 2.5 and RGM were 4.5 ± 3.1 ng m−3 (99.2%), 21.5 ± 16.4 pg m−3 (0.5%) and 14.2 ± 13.2 pg m−3 (0.3%), respectively. The concentrations for all the measured Hg species were highly variable throughout the year and were lower in winter than in the other three seasons. The maximum concentrations of Hg species were observed in June and were a result of the high number of Hg spikes (using [GEM] >10 ng m−3 as an indicator) that occurred in the month. Nighttime (between 9pm–6am) concentrations of Hg species were higher than those of daytime. The results revealed: (1) an urban area is a continuous source of Hg species that have the potential to pose impacts on local, regional and global scales; (2) local/regional anthropogenic sources contributed significantly to the levels and the distributions of the Hg species in the urban atmosphere. More studies are needed to identify and quantify the anthropogenic sources of Hg and the Hg species emitted from these sources; (3) surface emission and photochemical reactions (including the reactions involving ozone) did not have significant influence on the levels of Hg species and their distribution in the urban atmosphere.

Graphical abstract: Annual atmospheric mercury species in Downtown Toronto, Canada

Article information

Article type
Paper
Submitted
04 Sep 2008
Accepted
11 Dec 2008
First published
07 Jan 2009

J. Environ. Monit., 2009,11, 660-669

Annual atmospheric mercury species in Downtown Toronto, Canada

X. Song, I. Cheng and J. Lu, J. Environ. Monit., 2009, 11, 660 DOI: 10.1039/B815435J

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