Hg. Lohmannsroben et L. Schober, Combination of laser-induced fluorescence and diffuse-reflectance spectroscopy for the in situ analysis of Diesel-fuel-contaminated soils, APPL OPTICS, 38(9), 1999, pp. 1404-1410
Results of our laser-induced fluorescence (LIF) and diffuse-reflectance inv
estigations of quartz sand and different soils spiked with Diesel fuel are
reported. The LIF calibration functions, which were found to be significant
ly different for the various matrices, and the limits of detection were det
ermined. For excitation at lambda(ex) = 266 nm, the Limits of detection obt
ained ranged from 7 parts in 10(6) for quartz sand to similar to 200 parts
in 10(6) for dark sand with organic matter and for dark pest. Furthermore,
the diffuse-reflectance spectra of the matrices in the ultraviolet-near-IR
range were determined. An attempt to correlate the slopes of the LIF calibr
ation functions with the reflectances of the matrices is presented. The obt
ained normalized calibration functions are well suited to take into account
relevant optical soil parameters and to reduce the variability of the LIF
calibration behavior significantly. (C) 1999 Optical Society of America.