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Evaluation of diffe...
Evaluation of different approaches to quantify strong organic acidity and acid-base buffering of organic-rich surface waters in Sweden
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Köhler, S (författare)
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Hruska, J (författare)
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- Jönsson, Jörgen (författare)
- Umeå universitet,Kemiska institutionen
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- Lövgren, Lars (författare)
- Umeå universitet,Kemiska institutionen
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Lofts, S (författare)
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(creator_code:org_t)
- 2002
- 2002
- Engelska.
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Ingår i: Water Research, Volume. ; 36:18, s. 4487-96
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- Organic acidity
- Air-equilibrated pH
- Alkalinity
- WHAM V
- Surface waters
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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