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Functional properties of DOM in a stream draining blanket peat

Thacker, S. A.; Tipping, E.; Gondar, D.; Baker, A.. 2008 Functional properties of DOM in a stream draining blanket peat. Science of the Total Environment, 407 (1). 566-573. 10.1016/j.scitotenv.2008.09.011

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Abstract/Summary

The functional properties of dissolved organic matter (DOM) from Rough Sike, a stream draining blanket peat in the northern Pennines, UK, were investigated using a series of 12 standardised assays. Nine stream samples were collected at different discharges during 2003-2006, and DOM concentrates obtained by low-temperature rotary evaporation. Suwannee River Fulvic Acid was used as a quality control standard in the assays. Dissolved organic matter in high-discharge samples was more light-absorbing at 280 and 340 nm and adsorbed more strongly to alumina, than DOM characteristic of low streamflow, but was less fluorescent and hydrophilic, and poorer in proton-dissociating groups. No significant differences were found in light absorption at 254 nm, copper- or benzo(a)pyrene binding, or photochemical fading. Combination of the Rough Sike data with previously-published results for other streams and a lake yields totals of 20-23 values per assay, for a range of DOM types. Analysis of these data shows that DOM hydrophilicity and adsorption are well-predicted by linear relationships with the extinction coefficient at 340 nm (E340), while good quadratic relationships exist between E340 and both buffering capacity and fluorescence. Variability in all the assays is significant (p < 0.001), as judged by comparison with variations in repeat measurements on the quality control standard.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.scitotenv.2008.09.011
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.2 Carbon
CEH Sections: Shore
ISSN: 0048-9697
Additional Keywords: Discharge, Dissolved organic matter, Functional properties, Peat, Stream
NORA Subject Terms: Ecology and Environment
Chemistry
Date made live: 08 Dec 2008 13:33
URI: http://nora.nerc.ac.uk/id/eprint/4950

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