Characterization of chemical composition and size of diesel exhaust particulate matter by LDITOF/MS

J. Suro, Q. Chen, I. M. Kennedy, T. A. Cahill, P. B. Kelly

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Scopus citations


Diesel engines are known to create large amounts of particulate matter and PAH and their derivatives. The applicability of Laser Desorption Ionization Time of Flight MS (LDIYOF/MS) as a rapid screening method in the analysis of particulate matter was investigated. Diesel soot samples were collected from an experimental injection one cylinder diesel engine aspirated at normal pressure. Reformulated California grade diesel fuel was used in the experiment. Positive ion mass spectra for diesel five particle size ranges from < 0.7 to > 2.5μm in dia showed that low mass peaks (identified as PAH) were more abundant in particles > 2.5μm, than particles < 0.07μm. High mass PAH was associated with fine particulate. Only the smallest particles had significant amounts of PAH with mass greater than 400 amu. Negative mass ion spectra for the same particle size range revealed inorganic ions OH -, Cl -, NO 2 -, and NO 3 -. Very fine particles < 0.07μm showed significantly higher HSO 4 - than any of the spectra for larger particles.

Original languageEnglish (US)
Title of host publicationACS Division of Fuel Chemistry, Preprints
Number of pages5
StatePublished - 2000
Event219th ACS National Meeting - San Francisco, CA, United States
Duration: Mar 26 2000Mar 30 2000


Other219th ACS National Meeting
Country/TerritoryUnited States
CitySan Francisco, CA


  • Diesel soot
  • Polycyclic aromatic hydrocarbons
  • Time of flight mass spectrometry

ASJC Scopus subject areas

  • Energy(all)


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