Four-Way Data Coupled to Parallel Factor Model Applied to Environmental Analysis: Determination of 2,3,7,8-tetrachloro-dibenzo-para-dioxin in Highly Contaminated Waters by Solid-Liquid Extraction Laser- Excited Time-Resolved Shpol'skii Spectroscopy

H. GOICOECHEA, S. YU, A. OLIVIERI AND A. CAMPIGLIA

ANALYTICAL CHEMISTRY

American Chemical Society

Lugar: New York; Año: 2005 vol. 77 p. 2608 - 2616

0003-2700

This article reports the first application of parallel factor analysis to high-order instrumental data generated from Shpol’skii matrixes at liquid helium temperature. Third order data arrays - consisting of excitation modulated wavelength time matrices - are collected with the aid of a cryogenic fiber optic probe, a tunable dye laser and a multi-channel system for phosphorescence detection. The multidimensional data formats are applied to the analysis of 2,3,7,8-tetrachloro-dibenzo-para-dioxin in water samples. The experimental procedure is rapid and environmentally friendly. Complete sample analysis is accomplished in less than 15 min with only 100 mL of organic solvent (n-heptane). The feasibility to directly determine parts-per-trillion concentration levels of the target compound is demonstrated with heavily contaminated samples of unknown composition.