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Simulating the long-term chemistry of an upland UK catchment: Heavy metals

Tipping, E.; Lawlor, A. J.; Lofts, S.; Shotbolt, L.. 2006 Simulating the long-term chemistry of an upland UK catchment: Heavy metals. Environmental Pollution, 141. 139-150. 10.1016/j.envpol.2005.08.019

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Abstract/Summary

CHUM-AM was used to investigate the behaviours of atmospherically-deposited heavy metals (Ni, Cu, Zn, Cd and Pb) in three moorland sub-catchments in Cumbria UK. The principal processes controlling cationic metals are competitive partitioning to soil organic matter, chemical interactions in solution, and chemical weathering. Metal deposition histories were generated by combining measured data for the last 30 years with local lake sediment records. For Ni, Cu, Zn and Cd, default parameters for the interactions with organic matter provided reasonable agreement between simulated and observed present-day soil metal pools and average streamwater concentrations. However, for Pb, the soil binding affinity in the model had to be increased to match the observations. Simulations suggest that weakly-sorbing metals (Ni, Zn, Cd) will respond on timescales of decades to centuries to changes in metal inputs or acidification status. More strongly-sorbing metals (Cu, Pb) will respond over centuries to millennia. Catchment turnover times for the strongly-retained metals Cu and Pb are of the order of centuries, whereas those for the more mobile Ni, Zn and Cd are appreciably shorter.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2005.08.019
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections: _ Environmental Chemistry & Pollution
ISSN: 0269-7491
Additional Keywords: Atmospheric deposition, Catchment, Heavy metals, Modelling, Soil organic matter, Weathering
NORA Subject Terms: Hydrology
Chemistry
Atmospheric Sciences
Date made live: 21 Jun 2007 13:21
URI: http://nora.nerc.ac.uk/id/eprint/492

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