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Reduced Atmospheric Manganese in Montreal Following Removal of Methylcyclopentadienyl Manganese Tricarbonyl (MMT)

Joly, Alexandre*; Lambert, Jean; Gagnon, Claude; Szyncel, Kristof*; Kennedy, Greg§; Mergler, Donna; Zayed, Joseph*

doi: 10.1097/01.ede.0000362372.19894.21
Abstracts: ISEE 21st Annual Conference, Dublin, Ireland, August 25–29, 2009: Symposium Abstracts

*Department of Occupational and environmental health, Université de Montréal, Montreal, Quebec, Canada; †Department of Social and preventive medicine, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada; ‡Montreal Urban Community, Montreal, Quebec, Canada; §Department of Engineering Physics, École Polytechnique de Montréal, Montreal, Quebec, Canada; and ¶CINBIOSE (Centre de recherche interdisciplinaire sur la biologie, la santé, la société et l'environnement), University of Quebec in Montreal, Montreal, Quebec, Canada.


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Background and Objectives:

Methylcyclopentadienyl Manganese Tricarbonyl (MMT) was used as an antiknock agent and as an octane booster in Canadian unleaded gasoline. Its combustion leads to Mn emissions. Considering that MMT is no longer used in the Canadian gasoline since 2003, the objective of this research was to examine the variations in atmospheric Mn in Montreal (Canada) from 2001 to 2007, covering the period prior (2001–2003) to and following (2005–2007) MMT use.

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Three sampling stations were selected because their proximity to roads with widely differing and well-known traffic. Filters from 2001 to 2007 were obtained. The first sample of each month was selected and Mn analysis was performed by neutron activation analysis. TSP (total suspended particulates) was calculated by weighing the filters before and after dust collection.

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Results show a significant decrease of Mn over time at each station while TSP decreased significantly in two stations. Comparing atmospheric Mn during and after the period of use of MMT 2001–2003 vs 2005–2007 showed a significant decrease at all stations. For TSP, only one station showed borderline significant difference between these two periods. The difference between the two periods shows 41% and 17% of decrease for Mn and TSP, respectively.

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These data suggest that the combustion of MMT led to an increase of airborne Mn of approximately 24%. These results should help in decision-making processes leading to the acceptance or rejection of the use of MMT in gasoline in other countries.

© 2009 Lippincott Williams & Wilkins, Inc.