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Physicochemical variations in DOM‐synchronous fluorescence: Implications for mixing studies
Author(s) -
Pullin Michael J.,
Cabaniss Stephen E.
Publication year - 1997
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1997.42.8.1766
Subject(s) - photobleaching , dissolved organic carbon , mixing (physics) , environmental chemistry , environmental science , chemistry , fluorescence , analytical chemistry (journal) , physics , optics , quantum mechanics
Synchronous fluorescence (SF) spectra of dissolved organic matter (DOM) show promise for mixing studies and can resolve multiple river inputs to large water masses in a single fast measurement. This study examines the effects of physicochemical variables on DOM SF, independent of mixing. Our results show that changes in the pH and metal ion concentration do not affect SF in the alkaline Cuyahoga‐Erie system. The effect of temperature is small and correctable. Model predictions suggest that photobleaching of DOM SF can limit the use of this method to short periods (3–7 d, depending on conditions). SF spectra are sensitive enough to detect 1% river water mixed in Lake Erie water.