Chemistry characterization of jet aircraft engine particulate matter by XPS: Results from APEX III. (September 2016)

• Record Type: Journal Article
• Authors: Vander Wal, Randy L.; Bryg, Victoria M.; Huang, Chung-Hsuan
• Is Part Of: Atmospheric environment. Volume 140(2016)
• Page Start: 623
• Page End: 629
• Publication Date: 2016-09
• Subjects: XPS -- APEX III -- Particulate matter (PM) -- Soot -- Surface chemistry; NASA national aeronautics and space administration -- TEM transmission electron microscopy -- XPS X-ray photoelectron spectroscopy; Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2016.05.039
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: This paper reports X-ray photoelectron spectroscopy (XPS) analysis of jet exhaust particulate matter (PM) from a B737, Lear, ERJ and A300 aircraft during the APEX III NASA led field campaign. Carbon hybridization and bonding chemistry are identified by high-resolution scans about the C1s core-shell region. Significant organic content as gauged by the sp 3 /sp 2 ratio is found across engines and powers. Polar oxygen functional groups include carboxylic, carbonyl and phenol with combined content of 20% or more. By survey scans various elements including transition metals are identified along with lighter elements such as S, N and O in the form of oxides. Additives within lubricants are probable sources of Na, Ba, Ca, Zn, P and possibly Sn. Elements present and their percentages varied significantly across all engines, not revealing any trend or identifiable cause for the differences, though the origin is likely the same for the same element when observed. This finding suggests that their collective presence could serve as an environmental tracer for identifying PM originating from aircraft engines and serving as a diagnostic for engine performance and wear. Graphical abstract: Highlights: An elemental analysis of nvPM from jet engines by X-ray photoelectron spectroscopy. Carbon bonding state and oxygen groups by XPS analysis. Environmental and health impacts dependent upon nvPM surface chemistry.