Share Email Print
cover

Proceedings Paper

Quantitative analysis of aromatic molecules in water by laser-induced fluorescence spectroscopy and multivariate calibration techniques
Author(s): Frank Lewitzka; Uwe Buenting; Peter Karlitschek; Matthias Niederkrueger; Gerd Marowsky
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We introduce a fiber optical sensor which is capable of analyzing polycyclic aromatic hydrocarbons (PAHs) and monoaromatics like benzene, toluene, xylene, and ethylbenzene (BTXE) in natural water samples. The compact system is based on laser-induced, time-resolved fluorescence emission spectroscopy. It uses a miniaturized all solid state laser which can be operated at 266 nm and 355 nm. The 3-D data set of a time-resolved fluorescence spectrum is reduced to a 2-D data set by a factor based technique, i.e. by dividing the raw data by a decay matrix with exponential decay profiles. The resulting data have a 2-D spectral format but still contain the temporal information. With these data a partial least squares regression has been carried out and optimized for a quantitative evaluation of the data. After the calibration xylene could be selectively analyzed in the 0 - 200 ppb range with a prediction error of 15 ppb. The PAH calibration was able to predict the concentration of 9 out of 15 EPA PAHs with errors between 0.07 (mu) g/l (benzo[a]pyrene) and 1.6 (mu) g/l (anthracene, naphthalene).

Paper Details

Date Published: 16 September 1999
PDF: 8 pages
Proc. SPIE 3821, Environmental Sensing and Applications, (16 September 1999); doi: 10.1117/12.364195
Show Author Affiliations
Frank Lewitzka, Laser-Lab. Goettingen e.V. (Germany)
Uwe Buenting, Laser-Lab. Goettingen e.V. (Austria)
Peter Karlitschek, Laser-Lab. Goettingen e.V. (Germany)
Matthias Niederkrueger, Laser-Lab. Goettingen e.V. (Germany)
Gerd Marowsky, Laser-Lab. Goettingen e.V. (Germany)


Published in SPIE Proceedings Vol. 3821:
Environmental Sensing and Applications
Michel R. Carleer; Moira Hilton; Torsten Lamp; Rainer Reuter; George M. Russwurm; Klaus Schaefer; Konradin Weber; Klaus C. H. Weitkamp; Jean-Pierre Wolf; Ljuba Woppowa, Editor(s)

© SPIE. Terms of Use
Back to Top