Multiwavelength laser-induced fluorescence spectroscopy for quantitative classification of aromatic hydrocarbons

Jens Bublitz; Wolfgang Schade

doi:10.1117/12.224108

9 October 1995 Multiwavelength laser-induced fluorescence spectroscopy for quantitative classification of aromatic hydrocarbons

Jens Bublitz, Wolfgang Schade

Author Affiliations +

Proceedings Volume 2504, Environmental Monitoring and Hazardous Waste Site Remediation; (1995) https://doi.org/10.1117/12.224108
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

Time-resolved laser-induced fluorescence (LIF) spectroscopy and laser excitation at 248 nm and 337 nm are applied to investigate fuel and oil contaminations in water with respect to classify between different aromatic hydrocarbons. The quantitative interpretation of the LIF- data is difficult because petroleum products are complex mixtures of hydrocarbons in various compositions. Solvent and concentration effects like fluorescence reabsorption or excimer formation cause a red shift of the fluorescence intensity spectra and a change in time evolution of the LIF-decay spectra. In this paper these effects are discussed with respect to practical applications. A time-integrated photon counting technique applying two different time-gates in combination with fiber optics has been drawn out to simplify the method, so it becomes very attractive for quantitative diagnostics of oil and fuel contaminations in water or soil samples. An example for on-line monitoring is reported.

Citation Download Citation

Jens Bublitz and Wolfgang Schade "Multiwavelength laser-induced fluorescence spectroscopy for quantitative classification of aromatic hydrocarbons", Proc. SPIE 2504, Environmental Monitoring and Hazardous Waste Site Remediation, (9 October 1995); https://doi.org/10.1117/12.224108

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