M. Kadosh et al., COLD-PLATE SAMPLING OF INTERNAL-COMBUSTION AEROSOLS FOR DIRECT LASER-INDUCED FLUORESCENCE ANALYSIS, Instrumentation science & technology, 26(4), 1998, pp. 343-351
Contaminated aerosols, produced by internal combustion processes, are
of considerable environmental concern. Laser Induced Fluorescence (LIF
) was applied for fast analysis of such aerosols. A ''cold-plate type'
' sampler, held at several fixed temperatures, was used for the in-sit
u, rapid pre-concentration of them. This way, the ambient air moisture
vapors quickly condense into microscopic size water droplets. These,
in turn, become polluted by the incoming nux of aerosols that, while b
eing captured within, undergo accumulation (dissolve or suspend). Comp
arative sensitivity of LIF spectra to application of a non-polar solve
nt (hexane) to these contaminated aqueous samples is addressed. Insitu
obtained LIF spectra allow non-destructive characterization of vehicl
e engine performance.