Abstract
Seasonal characteristics of surface water fulvic acids (FAs) isolated from Japanese clear-water lakes were investigated. Qualitative changes in Lake Biwa and Lake Tankai FAs were determined and compared. Although the relative molecular weights determined by high-performance size-exclusion chromatography did not change remarkably, the elemental compositions, \( E_{600}^{1\% } \) values and 1H- and 13C-NMR spectral properties varied with the season. Both the H/C and N/C ratios for Lake Biwa FAs tended to be higher than those for Lake Tankai FAs, but O/C ratios were lower and decreased from spring to winter. The \( E_{600}^{1\% } \) values suggested that Lake Biwa FAs contained lower levels of unsaturated structures than Lake Tankai FAs, and the amounts of these structures increased in winter. The 1H and 13C NMR spectra indicated that Lake Biwa FAs are richer in saturated aliphatic chains, especially in spring. Overall, Lake Biwa FAs exhibited clearer seasonal changes in these characteristics than Lake Tankai FAs, suggesting that the seasonal variation may depend on changes in aquatic microbial activities.
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Part of this work was supported by a grant-in-aid for scientific research (B-16380049, 2004–2007), and partially supported by the fund of the Department of Lake Biwa Environment, Shiga Prefecture, Japan.
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Fujitake, N., Tsuda, K., Aso, S. et al. Seasonal characteristics of surface water fulvic acids from Lake Biwa and Lake Tankai in Japan. Limnology 13, 45–53 (2012). https://doi.org/10.1007/s10201-011-0354-4
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DOI: https://doi.org/10.1007/s10201-011-0354-4