Characterization of manganese-containing particles collected from the exhaust emissions of automobiles running with MMT additive.
Methylcyclopentadienyl manganese tricarbonyl (MMT) is an organometallic compound used as an octane improver in unleaded gasoline.
The objective of this study was to determine the physical and the chemical characteristics of the manganese (Mn) compounds emitted from vehicles using MMT.
Particles emitted from the tailpipe were trapped and characterized by scanning electron microscopy (SEM) and X-ray energy dispersive spectrometry (EDS) and by analytical transmission electron microscopy (ATEM).
Results support the conclusion that Mn is emitted from the tailpipe primarily as a mixture of Mn-phosphate and Mn-sulfate with a size ranging between 0.2 and 10 mum.
ATEM characterization shows that the isolated particles consist of manganese-oxygen-phosphorus-sulfur (Mn-O-P-S) (in order of a descending peak intensity), indicating that Mn-phosphate is the main constituent of the residual particles.
Moreover, all the Mn-containing particles investigated were amorphous.
Further toxicological studies with a mixture of Mn-phosphate and Mn-sulfate are needed to provide successful implementation of evidence-based risk assessment approaches.
Mots-clés Pascal : Pollution air, Emission polluant, Gaz échappement, Véhicule à moteur, Automobile, Essence sans plomb, Additif, Antidétonant, Manganèse Carbonyle Complexe, Particule en suspension, Propriété physicochimique, Dimension particule, Morphologie, Analyse chimique, Composition chimique, Manganèse oxyde, Manganèse sulfate, Manganèse phosphate, Toxicité, Homme
Mots-clés Pascal anglais : Air pollution, Pollutant emission, Exhaust gas, Motor vehicle, Motor car, Unleaded gasoline, Additive, Antiknock additive, Manganese Carbonyl Complexes, Suspended particle, Physicochemical properties, Particle size, Morphology, Chemical analysis, Chemical composition, Manganese oxides, Manganese sulfate, Manganese phosphate, Toxicity, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0518743
Code Inist : 001D16C04C. Création : 18/05/2000.