Ryoji Tanaka
Okayama University
Analytical chemistryChondriteVolcanoInternal medicineGeologyMeteoriteBasaltIsotopeMaficGeochemistryImpact craterAeolian processesChemistryMaterials scienceEarth scienceMineralogyPlumeSilicateOlivineOxygenAsteroidMantle (geology)d18OIsotopes of oxygenMedicineAstrobiologyFractionation
87Publications
14H-index
826Citations
Publications 68
Newest
#1Dilan M. Ratnayake (Okayama University)
#2Ryoji Tanaka (Okayama University)H-Index: 14
Last. Eizo Nakamura (Okayama University)H-Index: 64
view all 3 authors...
Abstract null null Nickel isotope ratios have traditionally been used as an important tracer in cosmochemistry, and recently, it has gained attention in geochemistry, biochemistry, and environmental sciences with the development of MC-ICP-MS. Purification of Ni before isotope measurement is mandatory for obtaining precise data, which has been commonly achieved with ion-exchange chromatography, employing dimethylglyoxime (DMG) as a chelating agent for Ni. However, it has been pointed out that the...
Source
#1Karin Ching (UNSW: University of New South Wales)H-Index: 2
#2Andy Baker (UNSW: University of New South Wales)H-Index: 86
Last. Xianjue Chen (University of Newcastle)H-Index: 25
view all 8 authors...
Abstract null null We report pressure-driven liquid-phase isotope separation (dead-end filtration) to enrich D and 18O in natural water using graphene oxide (G-O) and UV-reduced graphene oxide (UV-rG-O) membranes. The isotope diffusivity (molecular diffusion and adsorption separation) was found to be responsible for isotope separation. Adsorption separation is the dominant mechanism for improvements in D and 18O enrichment via increased G-O loading that leads to the increased number of adsorptio...
Source
#1Ryoji Tanaka (Okayama University)H-Index: 14
#2Christian Potiszil (Okayama University)H-Index: 2
Last. Eizo Nakamura (Okayama University)H-Index: 64
view all 3 authors...
Source
#1Atsushi Nakao (Kyoto Prefectural University)H-Index: 11
#2Shiori Uno (Kyoto Prefectural University)
Last. Takashi Kosaki (Aichi University)H-Index: 26
view all 7 authors...
Abstract Deposition of Asian dust, i.e. mica-bearing aeolian particles, throughout geological times has contributed greatly to the increased ability of soil to specifically retain radiocesium (137Cs), particularly in soils derived from mica-deficient parent materials. Allophanic Andosols, volcanic mica-deficient soils, in Japan were hypothesized to contain fewer micaceous minerals proximal to volcanoes due to the dilution of Asian dust by thicker volcanic ash depositions. To test this hypothesis...
Source
#1Martin F. Miller (OU: Open University)H-Index: 12
#2Ryoji Tanaka (Okayama University)H-Index: 14
Last. Richard C. Greenwood (OU: Open University)H-Index: 37
view all 3 authors...
Source
#1Christian Potiszil (Okayama University)H-Index: 2
#2Ryoji Tanaka (Okayama University)H-Index: 14
Last. Eizo Nakamura (Okayama University)H-Index: 64
view all 5 authors...
The Hayabusa2 mission successfully collected samples from the asteroid Ryugu last year and will return these to Earth in December 2020. It is anticipated that the samples will enable the analysis of terrestrially uncontaminated organic matter and minerals. Such analyses are in turn expected to elucidate the evolution of organic matter through Solar System history, including the origination and processing of biogenically important molecules, which could have been utilized by the first organisms o...
Source
#1D. O. ZakharovH-Index: 7
#2Ryoji TanakaH-Index: 14
Last. Ilya N. BindemanH-Index: 57
view all 6 authors...
#1Atsushi NakaoH-Index: 11
Last. Junta YanaiH-Index: 20
view all 5 authors...
Source
#1D. O. Zakharov (UO: University of Oregon)H-Index: 7
#2Ilya N. Bindeman (UO: University of Oregon)H-Index: 57
Last. R.L. Hampton (UO: University of Oregon)H-Index: 1
view all 6 authors...
Abstract Mass-dependent fractionation of triple oxygen isotopes during water-rocks interaction has been previously used to constrain environmental conditions of the Precambrian. To validate those studies, we report high-precision triple oxygen isotope measurements (expressed as Δ′17O with reference slope 0.528) of quartz, epidote and well fluids from Krafla and Reykjanes geothermal areas of Iceland as well as measurements from the extinct 6 Ma Geitafell hydrothermal system. At these systems, bas...
Source
#3Ryoji TanakaH-Index: 14
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