Abstract
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.
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