PMID: 12775041May 31, 2003Paper

Is a universal model of organic acidity possible: comparison of the acid/base properties of dissolved organic carbon in the boreal and temperate zones

Environmental Science & Technology
Jakub HruskaKevin Bishop

Abstract

The acid/base properties of dissolved organic carbon (DOC) are an important feature of soil and surface waters. Large differences in the acid/base properties of DOC found by different studies might be interpreted as spatial and temporal differences in these properties. Different analytical techniques, however, may explain some of the differences. We used a combination of ion-exchange techniques, titration, and surface water chemistry data to evaluate DOC character from two substantially different areas--the relatively pristine boreal zone of Sweden and the heavily acidified temperate zone of the Czech Republic. We found a significantly higher site density (amount of carboxylic groups per milligram of DOC) for the Swedish sites (10.2 microequiv/mg of DOC +/- 0.6) as compared to the Czech sites (8.8 microequiv/mg of DOC +/- 0.5). This suggests a slightly higher buffering capacity for Swedish DOC. A triprotic model of a type commonly incorporated in biogeochemical models was used for estimating the DOC dissociation properties. For Swedish sites, the following constants were calibrated: pKa1 = 3.04, pKa2 = 4.51, and pKa3 = 6.46, while the constants for Czech sites were pKa1 = 2.5, pKa2 = 4.42, and pKa3 = 6.7. Despite differences in...Continue Reading

Citations

Jun 23, 2009·Environmental Monitoring and Assessment·Stefan LöfgrenTherese Zetterberg
Jun 11, 2010·Environmental Monitoring and Assessment·Hjalmar Laudon, Stephen A Norton
Jan 5, 2013·Ambio·Filip MoldanRichard F Wright
Jan 5, 2011·The Science of the Total Environment·Susanne C Schneider
Oct 25, 2008·Journal of Environmental Quality·Gregory B LawrenceCharles W Boylen
Dec 2, 2020·The Science of the Total Environment·Futing LiuJin Huang
Mar 25, 2010·Environmental Science & Technology·S HaalandR D Vogt
Apr 19, 2021·The Science of the Total Environment·Marie SimoninAgnès Richaume
Oct 21, 2010·Environmental Science & Technology·Carin S SjöstedtStephan J Köhler
May 23, 2013·Environmental Science & Technology·Elisabeth NeubauerThilo Hofmann
Jun 12, 2013·Environmental Science & Technology·Gregory B LawrenceSue Capone
Jan 28, 2015·Environmental Science & Technology·Habibollah Fakhraei, Charles T Driscoll
Feb 3, 2007·Environmental Science & Technology·G B LawrenceH A Simonin
Dec 27, 2021·The Science of the Total Environment·Clarisse C BlanchetPetri Nummi

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