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- Title
VARIATION OF ?<sup>14</sup>C AND d<sup>13</sup>C VALUES OF DISSOLVED HUMIC AND FULVIC ACIDS IN THE TOKACHI RIVER SYSTEM IN NORTHERN JAPAN.
- Authors
Nagao, Seiya; Aramaki, Takafumi; Fujitake, Nobuhide; Kodama, Hiroki; Tanaka, Takayuki; Ochiai, Shinya; Uchida, Masao; Shibata, Yasuyuki; Yamamoto, Masayoshi
- 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, d13C and ?14C values exhibit a decreasing trend from the upper to the lower and tributary sites, although the headwater site has heavier d13C and lower ?14C values than the upper site. Fulvic acids had similar d13C values from the upper to lower sites, but 123 higher in ?14C than those of humic acids on average. The d13C and ?14C 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 d13C and ?14C values in a single river basin.
- Subjects
JAPAN; CARBON isotopes; DISSOLVED humic substances; FULVIC acids; WATERSHEDS; HUMIC acid; NUCLEAR magnetic resonance spectroscopy
- Publication
Radiocarbon, 2013, Vol 55, Issue 2, p1007
- ISSN
0033-8222
- Publication type
Article
- DOI
10.1017/S0033822200058148