TY - JOUR
T1 - Characterization and thermodynamic study of humic acid in deep groundwater at Horonobe, Hokkaido, Japan
AU - Kimuro, Shingo
AU - Kirishima, Akira
AU - Nagao, Seiya
AU - Saito, Takumi
AU - Amano, Yuki
AU - Miyakawa, Kazuya
AU - Akiyama, Daisuke
AU - Sato, Nobuaki
N1 - Funding Information:
Part of this work was performed under the cooperative research program of Institute of Nature and Environmental Technology, Kanazawa University [accept number 37] and under the Research Program for CORE lab of ‘Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials(No. 20166005)’ in ‘Network Joint Research Center for Materials and Devices.’ This work has also been performed as a cooperative research with JAEA.
Publisher Copyright:
© 2017 Atomic Energy Society of Japan. All rights reserved.
PY - 2018/5/4
Y1 - 2018/5/4
N2 - In this study, humic substances (humic acid and fulvic acid) were isolated from deep groundwater at −350 m depth of Horonobe, Hokkaido, Japan to compare the characteristic property and reaction mechanism with generic humic acid isolated from surface soils. The size distributions of Horonobe humic substances were analyzed by size exclusion chromatography, flow-field flow fractionation, and total organic carbon measurement with ultrafiltration. All of them indicated small molecular weight and particle size of Horonobe humic acid in comparison with generic humic acids. Additionally, the simple protonation behavior of Horonobe humic substances similar to benzoic acid and/or phenol was revealed by thermodynamic quantities obtained by potentiometry and calorimetry. Consequently, molecular size and the reaction mechanism of Horonobe humic substances are different from generic humic acids, due to the characteristic origin.
AB - In this study, humic substances (humic acid and fulvic acid) were isolated from deep groundwater at −350 m depth of Horonobe, Hokkaido, Japan to compare the characteristic property and reaction mechanism with generic humic acid isolated from surface soils. The size distributions of Horonobe humic substances were analyzed by size exclusion chromatography, flow-field flow fractionation, and total organic carbon measurement with ultrafiltration. All of them indicated small molecular weight and particle size of Horonobe humic acid in comparison with generic humic acids. Additionally, the simple protonation behavior of Horonobe humic substances similar to benzoic acid and/or phenol was revealed by thermodynamic quantities obtained by potentiometry and calorimetry. Consequently, molecular size and the reaction mechanism of Horonobe humic substances are different from generic humic acids, due to the characteristic origin.
KW - Humic acid
KW - characterization
KW - saline groundwater
KW - thermodynamic quantities
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U2 - 10.1080/00223131.2017.1416690
DO - 10.1080/00223131.2017.1416690
M3 - Article
AN - SCOPUS:85038399688
SN - 0022-3131
VL - 55
SP - 503
EP - 515
JO - Journal of Nuclear Science and Technology
JF - Journal of Nuclear Science and Technology
IS - 5
ER -