Abstract
Samples of motor oil and creosote are subjected to three-dimensional fluorescence spectroscopy to document the shifting of excitation/emission maxima as the solutions undergo serial dilutions. Effects such as self-quenching of individual polycyclic aromatic hydrocarbons (PAHs) and energy transfer between PAHs combine to produce large red-shifts in the resulting fluorescence emission spectra. The concentration-imposed complications are also demonstrated for several synthetic ternary PAH mixtures and a diesel residue mimic.
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