Edouard Bastarache on fri 15 sep 00
Allo John,
here is an interesting abstract on this subject:
TITLE: Airborne manganese particulates and methylcyclopentadienyl manganese
tricarbonyl (MMT) at selected outdoor sites in Montreal.
AUTHORS: Zayed J; Thibault C; Gareau L; Kennedy G
AUTHOR AFFILIATION: Departement de medecine du travail et d'hygiene du
milieu, Faculte de medecine, Montreal, Quebec, Canada.
zayedj@erc.umontreal.ca
SOURCE: Neurotoxicology 1999 Apr-Jun;20(2-3):151-7
CITATION IDS: PMID: 10385879 UI: 99313657
ABSTRACT: This study aims to assess the atmospheric concentrations of
methylcyclopentadienyl manganese tricarbonyl (MMT), respirable manganese
(MNR) and total manganese (MnT) in certain specific microenvironments and to
provide an estimation of human exposure to MnR. Sampling was carried out in
five microenvironments: a gas station, an underground car park, downtown
Montreal, near an expressway and near an oil refinery. The samples were
collected using Gil-Air portable pumps during three days and were analyzed
by instrumental neutron activation analysis (INAA). The mean concentrations
of MnR, MnT and MMT were 0.036 microgram m-3, 0.103 microgram m-3 and 0.005
microgram m-3 respectively. The MnR/MnT ratios vary from 25% to 43% (mean
35%) while the MMT/MnT ratios averaged about 5%. Furthermore, the mean
concentration of the MnR measured near the expressway (0.053 microgram m-3)
is similar to the United States Environmental Protection Agency (U.S. EPA)
reference concentration (RfC = 0.05 microgram m-3). The average daily
environmental exposure dose to MNR is estimated at 0.010 microgram kg-1 d-1
and its contribution to the multimedia exposure (air, food and water) is
low. The overall results show a lack of potential exposure to MMT and
substantial concentrations of MnR near an expressway.
Edouard Bastarache
Dans / In "La Belle Province"
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
| |
|
