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The influence of organic acids in relation to acid deposition in controlling the acidity of soil and stream waters on a seasonal basis

Chapman, Pippa J.; Clark, Joanna M.; Reynolds, Brian; Adamson, John K.. 2008 The influence of organic acids in relation to acid deposition in controlling the acidity of soil and stream waters on a seasonal basis. Environmental Pollution, 151 (1). 110-120. 10.1016/jenvpol.2007.03.001

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Abstract/Summary

Much uncertainty still exists regarding the relative importance of organic acids in relation to acid deposition in controlling the acidity of soil and surface waters. This paper contributes to this debate by presenting analysis of seasonal variations in atmospheric deposition, soil solution and stream water chemistry for two UK headwater catchments with contrasting soils. Acid neutralising capacity (ANC), dissolved organic carbon (DOC) concentrations and the Na:Cl ratio of soil and stream waters displayed strong seasonal patterns with little seasonal variation observed in soil water pH. These patterns, plus the strong relationships between ANC, Cl and DOC, suggest that cation exchange and seasonal changes in the production of DOC and seasalt deposition are driving a shift in the proportion of acidity attributable to strong acid anions, from atmospheric deposition, during winter to predominantly organic acids in summer

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/jenvpol.2007.03.001
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: Emmett
Parr
ISSN: 0269-7491
Additional Keywords: Acidity, Acid neutralizing capacity (ANC), Dissolved organic carbon (DOC), Seasalt deposition, Seasonality
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Date made live: 09 Jan 2008 11:25
URI: http://nora.nerc.ac.uk/id/eprint/1788

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