| Buffering processes in a boreal dissolved organic carbon-rich stream during experimental acidification. | |
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MedLine Citation:
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PMID: 15093059 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The role of organic acids on surface water acidity as well as their buffering during anthropogenic acidification and subsequent recovery was studied in a field experiment on a total organic carbon (TOC)-rich stream draining the Svartberget catchment in northern Sweden. H(2)SO(4) was added to the stream to increase SO(4)(2-) concentration by 90 microeq l(-1) for 30 h. About 60% of the added H(+) was buffered by protonation of organic acids, another 20% was buffered by base cations released from the surface of the stream channel and only ca. 20% of the added acid remained unbuffered. TOC concentrations (27 mg l(-1)), and site density of carboxylic groups--8.6 microeq (mg TOC)(-1)--remained stable during the experiment. Two models of organic acid dissociation (a triprotic model and a monoprotic pH-dependent pKa model) were fitted to the experimental results. These models explained the observed variations in organic anions, but the model parameters were quite different from those reported by studies in Northern America and Central Europe. This experiment had substantially more buffering effect of TOC between pH 4.4 and 5.3, which is an environmentally important pH range. |
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Authors:
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J Hruska; S Köhler; K Bishop |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Environmental pollution (Barking, Essex : 1987) Volume: 106 ISSN: 0269-7491 ISO Abbreviation: Environ. Pollut. Publication Date: 1999 Jul |
Date Detail:
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Created Date: 2004-04-19 Completed Date: 2004-05-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8804476 Medline TA: Environ Pollut Country: England |
Other Details:
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Languages: eng Pagination: 55-65 Citation Subset: - |
Affiliation:
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Department of Forest Ecology, Swedish University of Agricultural Sciences, 901 83 Umeå, Sweden. hruska@cgu.cz |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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