Exposure of tryptophan (Trp) in aqueous solutions to UVA radiation resulted in decrease of Trp (C1) but generated an unknown fluorescent component (C2) with fluorescence emission maxima extending into wavelength range characteristic of humic substance (HS)-like material. The intensity of the two ...
Minimal amounts of fulvic-like substances were found in the wastewater secondary effluent sample. The fractions over a medium MW range (5,000-1,000 g/mol) showed higher aromaticity (humic in character) than any other fractions for all samples. Over a low MW range (below 680 g/mol), ...