title: Three- and four-way parallel factor (PARAFAC) analysis of photochemically induced excitation-emission kinetic fluorescence spectra.
abstract: Independently emerging fluorescence profiles of unknown, photochemically induced degradation products of several naturally non-fluorescent pesticides were monitored using single exposure excitation-emission fluorescence spectroscopy. Three-way parallel factor analysis (PARAFAC) was employed to uniquely resolve the pure fluorescent spectra of the overlapping photolysis products. The quantitative utility of EEM photolysis-based determinations was demonstrated by employing four-way PARAFAC models built from EEM time cubes of multiple fenvalerate samples. The 4-way PARAFAC models were then used to predict original pesticide concentrations resulting in conservative limit of detection and root mean square errors of calibration (RMSEC) of 3 microM each.
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, USA.
authors.forename: Michelle L
authors.initials: ML
authors.lastname: Nahorniak
authors.forename: Gary A
authors.initials: GA
authors.lastname: Cooper
authors.forename: Yoon-Chang
authors.initials: YC
authors.lastname: Kim
authors.forename: Karl S
authors.initials: KS
authors.lastname: Booksh
mesh_terms: D002138:Calibration; D005163:Factor Analysis, Statistical; D010575:Pesticides / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical