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An apparatus for real-time MS/MS analysis of individual airborne microparticles by laser ablation in an ion trap is described. The performance has been demonstrated by the detection of tributyl phosphate and bis(2-ethylhexyl) phosphate on silicon carbide and kaolin microparticles.

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Real-time analysis of individual diesel engine exhaust particles was demonstrated using an ion trap mass spectrometer. Measurements were made on the nebulized engine oil and diesel fuel for comparison with the exhaust particle analysis. Studies were performed on individual exhaust particles to determine composition as a function of aerodynamic size. MS/MS analysis positively identified low-mass PAHs as well as indicated the presence of high mass hydrogenated PAHs (HPAHs). The degree of PAH hydrogenation was found to be mass dependent. The origin of the HPAHs seems to be the diesel fuel. However, the HPAHs underwent some degree of oxidation during the combustion process on average. Indicators were found that might be used to determine combustion efficiency. The capability of the technique for on-line measurement of combustion processes was demonstrated.