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vol. 9, nr. 1 (2007)
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Resistance of model humic acids to ultraviolet-c radiation
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Patryk Pluciński1, Zbigniew Górski2, Janusz Sławiński3
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1 Institute of Dendrology, Polish Academy of Sciences, ul. Parkowa 6, 62-035 Kórnik
e-mail: patrykos@autograf.pl |
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2 Radiochemistry Laboratory of the Department of Physical Chemistry, Faculty of Chemical Technology, Poznan University of Technology, ul. Piotrowo 3, 60-695 Poznań |
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3 Institute of Ecotechnology, Higher Vacational State School, ul. K. Kard. S. Wyszynskiego 38, 62-200 Gniezno |
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vol. 9 (2007), nr. 1,
pp. 191-202
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abstract:
Increasing penetration of UV radiation into the Biosphere raises the question about the photo resistance of humic substances. Is there any dependence between the photoresitance and chemical composition of their precursors? Humic acids synthesized from pyrocatechol, hydroquinone + tyrosine, purpurogalline and commercial Fluka of natural origin were irradiated with the UV-C radiation. Fluorescence emission spectra, chemiluminescence imaging and absorption spectra of alkali solutions of humic acids before and after various time of irradiation were measured. The most resistant to UV-C radiation was synthetic humic acid from pyrocatechol, and the most labile was humic acid obtained from purpurogalline. Possible causes of the high/low photo resistance of humic acids are shortly considered.
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keywords:
humic acids, photo resistance, UV-C radiation, luminescence, chemiluminescence imaging
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original in:
English
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