Journal
WATER RESEARCH
Volume 46, Issue 14, Pages 4532-4542Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2012.05.021
Keywords
Dissolved organic carbon; Dissolved organic matter; Model; UV absorbance
Funding
- Natural Environment Research Council (NERC)
- NSERC Strategic Grant
- National Science Foundation's (NSF) Niwot Ridge Long Term Ecological Research Program [DEB-0423662]
- Direct For Biological Sciences
- Division Of Environmental Biology [1027341] Funding Source: National Science Foundation
- Natural Environment Research Council [ceh010023] Funding Source: researchfish
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We present a model that considers UV-absorbing dissolved organic matter (DOM) to consist of two components (A and B), each with a distinct and constant spectrum. Component A absorbs UV light strongly, and is therefore presumed to possess aromatic chromophores and hydrophobic character, whereas B absorbs weakly and can be assumed hydrophilic. We parameterised the model with dissolved organic carbon concentrations [DOC] and corresponding UV spectra for c. 1700 filtered surface water samples from North America and the United Kingdom, by optimising extinction coefficients for A and B, together with a small constant concentration of non-absorbing DOM (0.80 mg DOC L-1). Good unbiased predictions of [DOC] from absorbance data at 270 and 350 nm were obtained (r(2) = 0.98), the sum of squared residuals in [DOC] being reduced by 66% compared to a regression model fitted to absorbance at 270 nm alone. The parameterised model can use measured optical absorbance values at any pair of suitable wavelengths to calculate both [DOC] and the relative amounts of A and B in a water sample, i.e. measures of quantity and quality. Blind prediction of [DOC] was satisfactory for 9 of 11 independent data sets (181 of 213 individual samples). (C) 2012 Elsevier Ltd. All rights reserved.
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