Journal Article

Carbon isotope composition of dissolved humic and fulvic acids in the Tokachi river system

Seiya Nagao, Hiroki Kodama, Takafumi Aramaki, Nobuhide Fujitake, Masao Uchida and Yasuyuki Shibata

in Radiation Protection Dosimetry

Volume 146, issue 1-3, pages 322-325
Published in print July 2011 | ISSN: 0144-8420
Published online April 2011 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/rpd/ncr180
Carbon isotope composition of dissolved humic and fulvic acids in the Tokachi river system

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This study reports carbon isotopic ratios (Δ14C and δ13C) of dissolved humic and fulvic acids in the Tokachi River system, northern Japan. These acids have a refractory feature and they represent the largest fraction of dissolved organic matter in aquatic environments. The acids were isolated using the XAD extraction method from river water samples collected at three sites (on the upper and lower Tokachi River, and from one of its tributaries) in June 2004 and 2005. δ13C values were −27.8 to −26.9 ‰ for humic and fulvic acids. On the other hand, the Δ14C values ranged from −247 to +26 ‰ and the average values were −170±79 ‰ for humic acid and −44±73 ‰ for fulvic acid. The difference was attributed to the residence time of fulvic acid in the watershed being shorter than that of humic acid. The large variation suggested that humic substances have a different pathway in each watershed environment.

Journal Article.  1715 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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