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Concentration Dependence in the Spectra of Polycyclic Aromatic Hydrocarbon Mixtures by Front-Surface Fluorescence Analysis

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Abstract:

Polycyclic aromatic hydrocarbons (PAHs) are a challenge for fluorescence analysis. Inner-filter quenching effects and energy transfers of PAHs in petroleum differ with concentration, leading to characteristically different fluorescence. At high concentrations of single PAH molecules and petroleum mixtures the classic rectangular quartz cell presents a particular challenge due to inner filter effects from right-angle illumination. While quite a few instrumental and mathematical corrections for these effects are reported throughout the literature, for researchers with standard instrumental sample compartments a triangular fluorometer cell can be used to emulate front-surface fluorescence analysis. This work presents concentration study results from the single PAH molecules fluoranthene and azulene dissolved in spectral-grade cyclohexane and also seeks to correct an aspect of our past work on the fluorescence of petroleum mixtures.

Keywords: AZULENE; CONCENTRATION EFFECTS; EEMS; EXCITATION EMISSION MATRIX SPECTROSCOPY; FLUORANTHENE; FLUOROPHORE; FRONT SURFACE FLUORESCENCE; PAHS; PETROLEUM; POLYCYCLIC AROMATIC HYDROCARBON; TRIANGULAR CELL

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370207781746026

Affiliations: 1: Department of Chemistry, Bellarmine University, 2001 Newberg Road, Louisville, Kentucky 40205. jsinski@bellarmine.edu 2: Department of Chemistry, Bellarmine University, 2001 Newberg Road, Louisville, Kentucky 40205

Publication date: September 1, 2007

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