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Variation of Δ14C and δ13C Values of Dissolved Humic and Fulvic Acids in the Tokachi River System in Northern Japan

Published online by Cambridge University Press:  09 February 2016

Seiya Nagao ,
Takafumi Aramaki ,
Nobuhide Fujitake ,
Hiroki Kodama ,
Takayuki Tanaka ,
Shinya Ochiai ,
Masao Uchida ,
Yasuyuki Shibata  and
Masayoshi Yamamoto
Seiya Nagao*
Affiliation:
Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Japan
Takafumi Aramaki
Affiliation:
Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, Japan
Nobuhide Fujitake
Affiliation:
Graduate School of Agricultural Science, Kobe University, Japan
Hiroki Kodama
Affiliation:
Analytical Research Center for Experimental Science, Saga University, Japan
Takayuki Tanaka
Affiliation:
Aomori Research and Development Center, Japan Atomic Energy Agency, Japan
Shinya Ochiai
Affiliation:
Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Japan
Masao Uchida
Affiliation:
Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, Japan
Yasuyuki Shibata
Affiliation:
Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, Japan
Masayoshi Yamamoto
Affiliation:
Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Japan
*
2Corresponding author. Email: [email protected].
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Abstract

Characteristics of dissolved humic and fulvic acids in river waters were studied during 2003–2005 at 4 sites located in the headwaters and in the upper and lower Tokachi River, including a lowland tributary site. Fulvic acids from the headwaters to downstream areas have similar elemental composition and 13C-NMR spectra. Humic acids have similar characteristics in the Tokachi River system. In contrast, δ13C and Δ14C values exhibit a decreasing trend from the upper to the lower and tributary sites, although the headwater site has heavier δ13C and lower Δ14C values than the upper site. Fulvic acids had similar δ13C values from the upper to lower sites, but 123′ higher in Δ14C than those of humic acids on average. The δ13C and Δ14C values exhibited differences in downward variation for humic and fulvic acids. In the Tokachi River system, these results suggest that differences in transport pathways and residence times of humic and fulvic acids reflect differences in the δ13C and Δ14C values in a single river basin.

Type
Articles
Information
Radiocarbon , Volume 55 , Issue 2: Proceedings of the 21st International Radiocarbon Conference (Part 1 of 2) , 2013 , pp. 1007 - 1016
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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