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Evaluation of different approaches to quantify strong organic acidity and acid-base buffering of organic-rich surface waters in Sweden
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
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2002 (English)In: Water Research, Volume, Vol. 36, no 18, 4487-96 p.Article in journal (Refereed) Published
Abstract [en]

The role of organic acids in buffering pH in surface waters has been studied using a small brownwater stream (26mgL-1 TOC) draining a forested catchment in Northern Sweden. Under the conditions of elevated pressure of CO2 stream field pH was changed between 3.5 and 6.1 during the acidification and alkalinization experiment. Acid-base characteristics of the natural organic matter were also determined using a high precision potentiometric method for a concentrated sample from the same stream. We compared the predictions from the Windermere Humic Aqueous Model (WHAM Model V), a model derived from the potentiometric titration (diprotic/monoprotic acid model) and a previously derived triprotic acid model which only uses alkalinity and TOC as input variables. The predicted buffering characteristics of all three models are very similar in the pH range 4.5-7 which suggests that during routine analysis alkalinity and TOC are sufficient to give a good estimate of organic acid anion charge contribution in a large range of surface waters. A slightly adjusted version of WHAM V successfully describes the organic charge contribution in a large number of sampled surface water lakes, which were previously used to calibrate the triprotic model.

Place, publisher, year, edition, pages
2002. Vol. 36, no 18, 4487-96 p.
Keyword [en]
Organic acidity, Air-equilibrated pH, Alkalinity, WHAM V, Surface waters
URN: urn:nbn:se:umu:diva-9060DOI: doi:10.1016/S0043-1354(02)00187-2OAI: diva2:148731
Available from: 2008-06-04 Created: 2008-06-04 Last updated: 2011-01-13Bibliographically approved

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