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Functional variability of dissolved organic matter from the surface water of a productive lake

Gondar, D.; Thacker, S. A.; Tipping, E.; Baker, A.. 2008 Functional variability of dissolved organic matter from the surface water of a productive lake. Water Research, 42 (1-2). 81-90. 10.1016/j.watres.2007.07.006

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Abstract/Summary

Functional variability of dissolved organic matter (DOM) from the surface water of Esthwaite Water (N. England) was investigated using a series of 12 standardised assays, which provide quantitative information on light absorption, fluorescence, photochemical fading, pH buffering, copper binding, benzo(a)pyrene binding, hydrophilicity, and adsorption to alumina. Ten lakewater samples were collected at different times of year during 2003–2005, and DOM concentrates obtained by low-temperature rotary evaporation. Suwannee River Fulvic Acid was used as a quality control standard. For nine of the assays, variability among DOM samples was significantly (p<0.01) greater than could be explained by analytical error. Seasonal trends observed for six of the assays could be explained by a simple mixing model in which the two end-members were DOM from the catchment (allochthonous) and DOM produced within the lake (autochthonous). The fraction of autochthonous DOM predicted by the model is significantly correlated (p<0.01) with chlorophyll concentration, consistent with production from phytoplankton. Autochthonous DOM is less light-absorbing, less fluorescent, more hydrophilic, and possesses fewer proton-dissociating groups, than allochthonous material.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.watres.2007.07.006
Programmes: CEH Programmes pre-2009 publications > Water > WA02 Quantifying processes that link water quality and quantity, biota and physical environment > WA02.3 Physico-chemical processes and effects on freshwater biot
CEH Sections: Shore
ISSN: 1323-1650
Additional Keywords: Allochthonous, Autochthonous, chlorophyll a, dissolved organic matter, functions, lakes
NORA Subject Terms: Ecology and Environment
Date made live: 19 Mar 2008 09:43
URI: http://nora.nerc.ac.uk/id/eprint/2201

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