Abstract
Fulvic acids were isolated from leaves leachate which had seen no light, and were characterized by spectroscopic methods (UV-VIS; fluorescence; FT-IR; laser flash). The results are compared with those for irradiated (254 nm) samples and with those for humic substances isolated from a brownwater lake. There is a significant bleaching effect at long term irradiation and a loss of dissolved organic carbon, especially in the presence of oxygen. Humic substances which have not been exposed to light seem to be more photoreactive than irradiated ones. Excitation experiments provide evidence for the existence of transients with a lifetime of 10 to 100 ps. The results are helpful for the understanding of the genesis of humic substances.
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