Dissolved organic carbon fractions in Finnish and Maine (USA) lakes

Tuija Mattsson, Pirkko Kortelainen, Mark B. David

Research output: Contribution to journalConference articlepeer-review


Dissolved organic carbon (DOC) was examined in 17 Finnish lakes, 6 Finnish streams, and 30 Maine (USA) lakes by fractionating DOC into hydrophobic acids and neutrals, and hydrophilic acids, bases, and neutrals. A procedure using XAD-8, anion-exchange, and cation-exchange resins was used. In every sample, organic acids dominated, averaging 82% of DOC. No major differences in DOC fractions between Maine lakes and Finnish lakes were found. However, differences in DOC fractions were found between lakes with low and high DOC. The proportion of hydrophobic acids increased with increasing DOC, whereas the proportion of hydrophilic acids decreased with increasing DOC. Low DOC lakes had a greater proportion of their DOC as hydrophilic neutrals compared with high DOC lakes. On the basis of the fractionation results, linear equations were developed for the relationships between the total DOC and the proportions of hydrophobic and hydrophilic acids of the total DOC.

Original languageEnglish (US)
Pages (from-to)521-525
Number of pages5
JournalEnvironment international
Issue number5-6
StatePublished - 1998
EventProceedings of the 1997 6th Nordic Symposium on Humic Substances - Hameelinna, Finland
Duration: Jun 9 1997Jun 12 1997

ASJC Scopus subject areas

  • General Environmental Science


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