Results and Discussion
One-dimensional (single-parameter) characterization of UVVA spectra. Figure 1 shows a conventional (absorptivity vs. wavelength) spectrum for a diluted oil sample (1.2 10-4 v/v in toluene). Vertical lines denote two standard wavelengths widely employed for one-dimensional UVVA characterization of humic matter via a co-called E4/E6 ratio of absorptivities measured at 465 and 665 nm