Date of download: 10/6/2017 Copyright © ASME. All rights reserved. From: Gas Turbine Engine Emissions—Part II: Chemical Properties of Particulate Matter J. Eng. Gas Turbines Power. 2010;132(6):061505-061505-15. doi:10.1115/1.4000132 Figure Legend: Mass spectra of exhaust gas samples from three engines (CJ6108A, CFM56-3B1, and RB211-535E4-B) and two lubrication oils (Mobil II and Air BP). Mass spectra of the lubrication oils were obtained by aerosolizing oil samples obtained from the engines (Mobil II from the RB211-535E4-B and Air BP from CFM56-3B1). Characteristic m/z signals are highlighted for easy reference. The m/z=27/29, 41/43, 55/57 series is due to hydrocarbons. The m/z=85, 113, 127 series is likely due to the synthetic esters in lubrication oil.