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Metal accumulation by stream bryophytes, related to chemical speciation

Tipping, E.; Vincent, C. D.; Lawlor, A. J.; Lofts, S.. 2008 Metal accumulation by stream bryophytes, related to chemical speciation. Environmental Pollution, 156 (3). 936-943. 10.1016/j.envpol.2008.05.010

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Abstract/Summary

Metal accumulation by aquatic bryophytes was investigated using data for headwater streams of differing chemistry. The Windermere Humic Aqueous Model (WHAM) was applied to calculate chemical speciation, including competitive proton and metal interactions with external binding sites on the plants. The speciation modelling approach gives smaller deviations between observed and predicted bryophyte contents of Cu, Zn, Cd and Pb than regressions based on total filtered metal concentrations. If all five metals are considered together, the WHAM predictions are superior at the 1 % level. Optimised constants for bryophyte binding by the trace metals are similar to those for humic substances and simple carboxylate ligands. Bryophyte contents of Na, Mg and Ca are approximately explained by binding at external sites, while most of the K is intracellular. Oxide phases account for some of the Al, and most of the Mn, Fe and Co.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2008.05.010
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: 0269-7491
Additional Keywords: Bryophytes, Streamwaters, WHAM, Chemical speciation, Trace metals
NORA Subject Terms: Botany
Ecology and Environment
Chemistry
Date made live: 08 Dec 2008 14:32
URI: http://nora.nerc.ac.uk/id/eprint/4963

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