Particulate matter and manganese exposures in Toronto, Canada.
Methylcyclopentadienyl manganese tricarbonyl (MMT) is a manganese-based gasoline additive used to enhance automobile performance.
MMT has been used in Canadian gasoline for about 20 yr.
Because of the potential for increased levels of Mn in particulate matter resulting from automotive exhausts, a large-scale population-based exposure study (~1000 participant periods) was conducted in Toronto, Canada, to estimate the distribution of 3-day average personal exposures to particulate matter (PM2.5 and PM10) and Mn.
A stratified, three-stage, two-phase probability, longitudinal sample design of the metropolitan population was employed.
Residential indoor and outdoor, and ambient levels (at a fixed site and on a roof) of PM2.5, PM10, and Mn were also measured.
Supplementary data on traffic counts, meteorology, MMT levels in gasoline, personal occupations, and activities (e.g. amount of vehicular usage) were collected.
Overall precision (% RSD) for analysis of duplicate co-located samples ranged from 2.5 to 5.0% for particulate matter and 3.1 to 5.5% for Mn.
The detection limits were 1.47 and 3.45 mug/m3 for the PM10 and PM2.5 fractions, respectively, and 5.50 and 1.83 ng/m3 for Mn in PM10 and PM2.5, respectively.
These low detection limits permitted the reporting of concentrations for>98% of the samples.
For PM10, the personal particulate matter levels (median 48.5 mug/m3) were much higher than either indoor (23.1 mug/m3) or outdoor levels (23.6 mug/m3). (...)
Mots-clés Pascal : Canada, Amérique du Nord, Amérique, Toronto, Trafic routier urbain, Véhicule à moteur, Essence sans plomb, Antidétonant, Manganèse Carbonyle Complexe, Manganèse Composé organique, Complexe hapto, Manganèse(êta5-méthylcyclopentadiényl) complexe, Métal transition Carbonyle Complexe, Zone urbaine, Pollution air, Pollution intérieur, Qualité air, Exposition, Surveillance, Métal lourd, Manganèse, Particule en suspension, Aérosol, Teneur, Analyse élémentaire, Corrélation
Mots-clés Pascal anglais : Canada, North America, America, Urban road traffic, Motor vehicle, Unleaded gasoline, Antiknock additive, Manganese Carbonyl Complexes, Manganese Organic compounds, Hapto complex, Transition metal Carbonyl Complexes, Urban area, Air pollution, Indoor pollution, Air quality, Exposure, Surveillance, Heavy metal, Manganese, Suspended particle, Aerosols, Content, Elementary analysis, Correlation
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0122443
Code Inist : 001D16C04C. Création : 16/11/1999.