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Quantification of natural DOM from UV absorption at two wavelengths

Tipping, Edward; Corbishley, Heather T.; Koprivnjak, Jean-Francois; Lapworth, Daniel J.; Miller, Matthew P.; Vincent, Colin D.; Hamilton-Taylor, John. 2009 Quantification of natural DOM from UV absorption at two wavelengths. Environmental Chemistry, 6 (6). 472-476. 10.1071/EN09090

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Abstract/Summary

The precise simulation of ultraviolet absorption by 23 contrasting surface-water DOM samples was achieved with a model based on two components, one absorbing light strongly (A) and the other weakly (B). The parameterised model can be used to predict [DOC] in water samples simply from absorbance values at two wavelengths, while information on DOM quality is provided by the calculated fractionation into A and B. The model was tested by predicting [DOC] for a separate dataset obtained by combining results for 12 samples each from surface waters in the UK, Canada and the USA, and from UK groundwaters. A close correlation (R2 = 0.997) was obtained, with only slight underestimation of the true [DOC]. The proportions of components A and B varied considerably among the sites, which explains why precise prediction of [DOC] from absorbance data at a single wavelength was not possible. When the model was applied to samples collected from river locations in a heterogeneous UK catchment with areas of industry and high human population, [DOC] was underestimated in many cases, which may indicate the presence of non-absorbing pollutant DOM.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1071/EN09090
Programmes: BGS Programmes 2009 > Groundwater science
CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.1 - Quantify & model processes that control the emission, fate and bioavailability of pollutants
CEH Sections: Shore
ISSN: 1448-2517
Additional Keywords: GroundwaterBGS, Groundwater, Groundwater quality, Analytical techniques, Dissolved organic carbon, Dissolved organic matter, Two-component model, UV spectra
NORA Subject Terms: Ecology and Environment
Chemistry
Related URLs:
Date made live: 18 Jan 2010 13:40
URI: http://nora.nerc.ac.uk/id/eprint/9071

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