Analysis of manganese particulates from automotive decomposition of methylcyclopentadienyl manganese tricarbonyl

Particulates have been collected and analyzed from automotive vehicles oper ating on fuel containing the organometallic antiknock additive methylcyclop entadienyl manganese tricarbonyl. Electron spectroscopy for chemical analys is 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 o f 2.5 mu m or less (PM2.5) in vehicle exhaust contain manganese primarily i n the form of a manganese phosphate and/or sulfate. (C) 1999 Published by E lsevier Science B.V. All rights reserved.