Analysis of manganese particulates from automotive decomposition of methylcyclopentadienyl manganese tricarbonyl

Particulates have been collected and analyzed from automotive vehicles operating on fuel containing the organometallic antiknock additive methylcyclopentadienyl manganese tricarbonyl. Electron spectroscopy for chemical analysis and L-edge X-ray absorption spectroscopy were used to study and identify the manganese species present in these emitted particulates. Results show that respirable size particulates with a mass median aerodynamic diameter of 2.5 mm or less PM2.5.in vehicle exhaust contain manganese primarily in the form of a manganese phosphate andror sulfate. q1999 Published by Elsevier Science B.V. All rights reserved.