title: Photocatalytic degradation-excitation-emission matrix fluorescence for increasing the selectivity of polycyclic aromatic hydrocarbon analyses.
abstract: The application of photocatalysis enhancement to calibration of fluorescence excitation-emission matrixes (EEMs) with parallel factor (PARAFAC) analysis is described. In this study, three- and four-way PARAFAC analysis was employed to extract the fluorescent species' spectra from overlapping EEMs. Time-dependent photocatalysis degradation of the polycyclic aromatic hydrocarbons (PAHs) was employed to create an additional dimension for analysis. The consequent four-dimension degradation-EEM data cubes have greater selectivity for each PAH than do three-dimension EEM data cubes alone. On a scale of 0 to 1, with 0 being completely collinear spectra and 1 being orthogonal spectra, including the time-dependent measurements increased the selectivity an average of 21%, from 0.73 to 0.87.
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, 85287-1604, USA.
authors.forename: Yoon-Chang
authors.initials: YC
authors.lastname: Kim
authors.forename: James A
authors.initials: JA
authors.lastname: Jordan
authors.forename: Michelle L
authors.initials: ML
authors.lastname: Nahorniak
authors.forename: Karl S
authors.initials: KS
authors.lastname: Booksh
mesh_terms: D002384:Catalysis; D010777:Photochemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000295:instrumentation* / Q000379:methods*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons