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A Multicomponent Model of Chromophoric Dissolved Organic Matter Photobleaching ¶ §
Author(s) -
Goldstone Jared V.,
Del Vecchio Rossana,
Blough Nell V.,
Voelker Bettina M.
Publication year - 2004
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2004.tb00049.x
Subject(s) - colored dissolved organic matter , photobleaching , chemistry , dissolved organic carbon , absorption (acoustics) , irradiation , monochromatic color , absorption spectroscopy , spectral line , fulvic acid , photochemistry , kinetics , analytical chemistry (journal) , fluorescence , environmental chemistry , optics , humic acid , physics , organic chemistry , phytoplankton , astronomy , nutrient , nuclear physics , fertilizer , quantum mechanics
Light absorption by chromophoric dissolved organic matter (CDOM) plays a number of roles in natural waters, including both control of the underwater light field and the initiation of many photochemical reactions. A multicomponent analysis was used to describe the effects of UV and visible radiation on the optical absorption spectra of two natural water samples, a Suwannee River fulvic acid standard (SRFA) and a Delaware Bay water sample. This analysis used a constrained minimization technique to fit independent spectral components to the observed bleaching behavior of the water samples under monochromatic irradiation. Spectra derived from these fits were used to predict the bleaching behavior of both samples under polychromatic irradiation (λ< 320 nm). This approach reproduces the kinetics and spectral behavior of polychromatic photobleaching very well at times <48 h, but underpredicts the bleaching at longer time periods.