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Journal Articles

Pore distribution of water-saturated compacted clay using NMR relaxometry and freezing temperature depression; Effects of density and salt concentration

Okubo, Takahiro*; Ibaraki, Moe*; Tachi, Yukio; Iwadate, Yasuhiko*

Applied Clay Science, 123, p.148 - 155, 2016/04

 Times Cited Count:25 Percentile:73.69(Chemistry, Physical)

The pore distribution of water-saturated compacted clay (Na-montmorillonite at 0.8 and 1.4 g/cm$$^{3}$$ saturated by three salt concentrations) was evaluated using $$^{1}$$H NMR relaxometry and freezing point depression. The populations of interlayer water with four hydrated state and non-interlayer water were calculated from the assumed thresholds. The sample with lower density exhibits higher population of non-interlayer water up to 55%. Low-temperature $$^{1}$$H NMR experiments in view of freezing point depression indicated that mesopore water in approximately 4 nm space observed in the calorimetric study was considered as non-interlayer water and the threshold temperature. The result showed that population of non-interlayer water by expected from freezing point depression agreed with $$^{1}$$H NMR relaxometry within 10%. Correlation experiments between longitudinal ($$T_{1}$$) and transverse relation times ($$T_{2}$$) at -10$$^{circ}$$C suggested that high-mobility bulk-like water molecules existed at a clay density of 1.4 g/cm$$^{3}$$.

Journal Articles

The Geochemistry of uranium in pore waters from lake sediments

Nagao, Seiya; Yanase, Nobuyuki; Yamamoto, Masayoshi*; Kofuji, H.*; Sorin, Yoshiki*; Amano, Hikaru

Journal of Radioanalytical and Nuclear Chemistry, 252(2), p.225 - 232, 2002/05

 Times Cited Count:9 Percentile:51.57(Chemistry, Analytical)

no abstracts in English

Journal Articles

Possible complexation of uranium with dissolved humic substances in pore water of marine sediments

Nagao, Seiya*;

Science of the Total Environment, 117-118, p.439 - 447, 1992/00

no abstracts in English

Journal Articles

Diffusion of an ion in rock pore water and its relation to pore characteristics

*; ; *; *

Kozan Chishitsu, 40(5), p.323 - 336, 1990/00

no abstracts in English

JAEA Reports

The Relation Among the Density Measwement Method of UO$$_{2}$$ Pellet

JAERI-M 7158, 23 Pages, 1977/07

JAERI-M-7158.pdf:0.92MB

no abstracts in English

Oral presentation

Diffusion and sorption of Sr in compacted sodium montmorillonite; Multispecies modeling

Tachi, Yukio; Yotsuji, Kenji; Ito, Tsuyoshi; Suyama, Tadahiro

no journal, , 

The integrated sorption and diffusion (ISD) model was applied for systems coexisting multispecies Sr (divalent cation Sr$$^{2+}$$ and neutral SrSO$$_{4}$$ (aq)) in compacted montmorillonite. Effective diffusion coefficients (De) and distribution coefficients (Kd) of Sr in compacted Na-montmorillonite (dry density of 800 kg/m$$^{3}$$) saturated with three types of Na$$_{2}$$SO$$_{4}$$ solutions (0.05, 0.1, 0.5 M) were measured by the trough-diffusion method. The De and Kd values decreased drastically with increasing porewater salinity. The De for multispecies Sr was determined as the harmonic weight-average considering the two species distribution and their log De values, based on comparison with reactive-transport calculations using the PHREEQC. As a result, the De trend could be quantitatively express by the ISD model considering multispecies contributions. The thermodynamic sorption model considering ion exchange reactions could provide reasonable account of Kd trend as functions of salinity.

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