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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 9:02 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Fluorescence assessment of dissolved organic matter daily variation in river waters
Authors:
E. Pfeiffer(1), A. Baker(2), G. Pavelescu(1), D. Savastru(1)
Affiliation:
1 National Institute for Optoelectronics, INOE 2000, Magurele, Romania
2 School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2T, UK
E-mail
frida@inoe.inoe.ro
Keywords:
fluorescence spectroscopy, dissolved organic matter, diurnal variability
Abstract:
It has been proved that the concentration of dissolved organic matter in rivers can vary annually and seasonally. Recent work brings us into attention the fact that dissolved organic matter may also have a diurnal variability. In this study, we investigate the fluorescence and absorption measurements performed on samples collected hourly in a two weeks experiment. High protein-like and humic-like fluorescence intensities are obtained during evenings, and lower intensities in the mornings. Strong fluorescence is observed two hours after storm events. During a snow event only the humic substances have been affected, no changes being observed at the protein-like fluorescence. Also, the fluorescence data are in perfect correlation with total organic carbon, phosphate and nitrate results. No correlation is observed between ammonia and protein-like or humic-like fluorescence.
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