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en: Investigation of the concentration ratios of anthropogenic metal elements in fresh snow at mountain area as a tracer for the discrimination between short and longrange transport contributions

en: Analytical Sciences

ja: Analytical Sciences


en: PICOLON dark matter search project

ja: PICOLON dark matter search project

en: Journal of Physics: Conference Series

ja: Journal of Physics: Conference Series


en: Isotopic analysis of nickel, copper, and zinc in various freshwater samples for source identification

en: Nickel (Ni), copper (Cu), and zinc (Zn) are commonly used in human activities and pollute aquatic environments including rivers and oceans. Recently, Ni, Cu, and Zn isotope ratios have been measured to identify their sources and cycles in environments. We precisely determined the Ni, Cu, and Zn isotope ratios in rain, snow, and rime collected from Uji City and Mt. Kajigamori in Japan, and investigated the potential of isotopic ratios as tracers of anthropogenic materials. The isotope and elemental ratios suggested that road dust is the main source of Cu in most rain, snow, and rime samples and that some of the Cu may originate from fossil fuel combustion. Zinc in the rain, snow, and rime samples may be partially attributed to Zn in road dust. Zinc isotope ratios in the Uji rain samples are lower than those in the road dust, which would be emitted via high temperature processes. Nickel isotope ratios are correlated with V/Ni ratios in the rain, snow, and rime samples, suggesting that their main source is heavy oil combustion. Furthermore, we analyzed water samples from the Uji and Tawara Rivers and the Kakita River spring in Japan. Nickel and Cu isotope ratios in the river water samples were significantly heavier than those in rain, snow, and rime samples, while Zn isotope ratios were similar. This is attributed to isotopic fractionation of Cu and Ni between particulate-dissolved phases in river water or soil.

en: Geochemical Journal

ja: Geochemical Journal


en: Determination of Trace Elements in Aerosols at a Rural Mountainous Area and a Local City of Eastern Shikoku Region, Japan


en: Natural Levels of Concentration of Cadmium, Lead and Non seasalt-Sulfate in Clean Rain and Fresh Snow collected in Remote and Rural Areas in Japan

ja: 日本の遠隔地における清浄な降雨・雪中のカドミウム, 鉛及び非海塩性硫酸イオンの人為活動に依存しない自然レベルの濃度

en: Bunseki Kagaku

ja: 分析化学


en: Composition and Origin of Cadmium and Lead in Snow Collected from Remote Mountain Area in Japan in a 2015 to 2018

ja: 2015年から2018年における国内遠隔山岳地域で採取した降雪中のカドミウムと鉛の組成及びその起源


en: A Rapid Enrichment Technique for the Ultratrace Determination of Nickel in Water Samples Using a Nanofiber-composite Membrane Filter

en: A new method for the rapid enrichment and highly sensitive determination of nickel ion has been developed by using a nanofiber-composite membrane filter, which was fabricated by stacking a nanofibrous material made of nylon 6 over a water-permeable membrane filter. The noncharged nickel-α-furil dioxime complex was adsorbed on a nanofibrous layer of the membrane filter under significantly higher flow rates than those used for conventional solid-phase extraction techniques. Highly sensitive determinations with detection limits at sub-parts per billion levels were achieved by enrichment from 50 mL of the complex solution, and the enrichment was completed within 3 min. The color that was developed on the membrane filter was successfully subjected to visual colorimetric analysis and quantitative determination by solid-phase spectrophotometry. In addition, colorimetric determination was feasible with a handheld spectrometer after elution of the colored agent with 50 μL of acetone. This combination of rapid enrichment and spectrometric measurement in a small-volume sample provides a useful analytical method suitable for on-site analysis, which requires neither expensive instruments nor high laboratory skills.


en: 実験室型X線吸収分光装置を用いた遠隔山岳地域で採取された湿性沈着中の長距離輸送エアロゾル中に含まれる鉄の化学状態分析


en: Sulfur Chemical State and Chemical Composition of Insoluble Substance in Soft Rime, Hard Rime and Snow collected on Remote and Rural Areas in Japan using WDXRF


en: Role of iron modifier on boron atomization process using graphite furnace-atomic absorption spectrometry based on speciation of iron using X-ray absorption fine structure

en: Spectrochimica Acta. Part B: Atomic Spectroscopy


en: Pb / Cd Ratios in Fresh Snow Derived from Cold Air Mass from Northern North Eastern China and Maritime Province in Russia at Remote Area along Japan Sea in Honshu Island and Long-range Transport Mechanism during Winter

ja: 本州日本海沿いの遠隔地における北東中国北部・ロシア沿海地方からの大気塊に由来する降雪中のPb/Cd比および冬季の長距離輸送機構


en: Atomization Mechanism of Boron by Graphite Furnace Atomic Absorption Spectrometry using Iron Matrix Modifier

ja: 鉄マトリクス修飾剤を用いた黒鉛炉原子吸光法によるホウ素の原子化機構


en: Long-range Transport Mechanism in 2014 ~ 2008 Winter Season of Cadmium, Lead and nonseasalt-Sulfate ion in Fresh Rime and Fresh Snow Collected on the summit of Mt. Kajigamori, Shikoku Island, Japan

ja: 2008年から2014年における高知県梶ヶ森山頂の樹氷と降雪中のカドミウム，鉛，非海塩性硫酸イオンの長距離輸送機構


en: Impact of competitive Fe(III) ion on complexation of humic acid and metal ions

ja: 鉄(III)イオン競合によるフミン酸と有害微量金属イオンの錯生成反応への影響


en: Classification and Long-range Transfport of Inorganic Small Spherical Particles in Snow collected on Mountain and Remote Aera along Japan Sea in Honshu Island, Japan

ja: 本州日本海沿いの遠隔地における降雪中の無機小球体粒子の組成と長距離輸送

en: In order to investigate the long-range transfer mechanism of inorganic small spherical particles in wet-depositions on mountains and remote areas along the Japan Sea in Honshu Island, Japan in 2014 and 2015, other than the summit of Mt. Kajigamori in Shikoku Island, Japan, the residue was obtained with a 0.45 μm pore-sized filter and a single-particle analysis was carried out for ones below 3 μm by using a Low-Vacuum Tabletop SEM-EDX. Particles were classified in six categories according to their compositions. In this work, it was found that a new category type of distribution patterns of the particles (Al-Si particle) was presented, and proposed that depended on the 24 h back-trajectory in Russia near the coast area of Japan Sea. Relationship between classification and back trajectory of air mass was investigated and discussed.


en: Study of the Roles of Chemical Modifiers in Determining Boron Using Graphite Furnace Atomic Absorption Spectrometry and Optimization of the Temperature Profile During Atomization

en: The measurement conditions for determining boron using graphite furnace-atomic absorption spectrometry (GF-AAS) were investigated. Differences in the boron absorbance profiles were found using three different commercially available GF-AAS instruments when the graphite atomizers in them were not tuned. The boron absorbances found with and without adjusting the graphite atomizers suggested that achieving an adequate absorbance for the determination of boron requires a sharp temperature profile that overshoots the target temperature during the atomization process. Chemical modifiers that could improve the boron absorbance without the need for using coating agents were tested. Calcium carbonate improved the boron absorbance but did not suppress variability in the peak height. Improvement of boron absorbance was comparatively less using iron nitrate or copper nitrate than using calcium carbonate, but variability in the peak height was clearly suppressed using iron nitrate or copper nitrate. The limit of detection was 0.0026 mg L(-1) when iron nitrate was used. It appears that iron nitrate is a useful new chemical modifier for the quick and simple determination of boron using GF-AAS.

en: Analytical Sciences


en: Classification of Inorganic Small Spherical Particles in Rime and Snow at the Summit of Mt. Kajigamori, Shikoku Island, Japan

ja: 四国・梶ヶ森山頂における樹氷および降雪中の無機小球体粒子の組成構成

en: In order to investigate the long-range transfer mechanism of inorganic small spherical particles in wet-depositions, such as rime, snow and glaze, on the summit of Mt. Kajigamori (1399.4 m alt.), Kochi, Shikoku Island, in 2011-2013, the residue was obtained with a 0.45 m pore-sized filter and then, a single-particle analysis was carried out for ones below 3 m by using a Low-Vacuum Tabletop scanning electron microscope-energy dispersion X-ray spectroscopy (SEM-EDX). Particles were classified in the six categories according to their compositions. In this work, it was found that two majour types of distribution patterns of the particles were presented. It was proposed that these depended on the 24 hrs back-trajectory, such as a typical fly-ash category in Huabei type and a Fe-Si-Al particle category in Dongbei type in China. The Zn-included particles were also analyzed.

en: Bunseki Kagaku


en: Size and composition analyses of colloids in deep granitic groundwater using microfiltration/ultrafiltration while maintaining in situ hydrochemical conditions

en: Colloids and Surfaces A:Physicochemical and Engineering Aspects


en: Concentrations of Chemical Constituents in Glaze at the Summit of Mt. Kajigamori in Kochi Prefecture, Shikoku Region, Japan

ja: 四国・高知県の梶ヶ森山頂における雨氷の化学成分濃度

en: The second and third glaze events in Shikoku region were observed to have arisen during the early morning in March 9/2012 and January 14/2013, respectively. In order to obtain information about the concentrations of chemical constituents in glaze, one of the samples was collected from the summit of Mt. Kajigamori (ALT. 1400 m), where is the watershed protection forest of Riv. Yoshinogawa is located. The concentrations of major soluble ions and toxic elements, such as Cd and Pb, were analyzed. High concentrations of nss-SO42- and Pb were observed with the back-trajectory over Middle and North China. The residues in the glaze were analyzed by a SEM-EDX technique. In the residue, various components of small spherical particulate were also found, indicating the presence of various origins of the fly-ash, including coal burning with the effect of long-range transport.


en: Sorption of Eu(III) on Granite: EPMA, LA-IPC-MS, Batch and Modeling Studies

en: Eu(III) sorption on granite was assessed using combined microscopic and macroscopic approaches in neutral to acidic conditions where the mobility of Eu(III) is generally considered to be high. Polished thin sections of the granite were reacted with solutions containing 10 μM of Eu(III) and were analyzed using EPMA and LA-ICP-MS. On most of the biotite grains, Eu enrichment up to 6 wt % was observed. The Eu-enriched parts of biotite commonly lose K, which is the interlayer cation of biotite, indicating that the sorption mode of Eu(III) by the biotite is cation exchange in the interlayer. The distributions of Eu appeared along the original cracks of the biotite. Those occurrences indicate that the prior water-rock interaction along the cracks engendered modification of biotite to possess affinity to the Eu(III). Batch Eu(III) sorption experiments on granite and biotite powders were conducted as functions of pH, Eu(III) loading, and ionic strength. The macroscopic sorption behavior of biotite was consistent with that of granite. At pH > 4, there was little pH dependence but strong ionic strength dependence of Eu(III) sorption. At pH < 4, the sorption of Eu(III) abruptly decreased with decreased pH. The sorption behavior at pH > 4 was reproducible reasonably by the modeling considering single-site cation exchange reactions. The decrease of Eu(III) sorption at pH < 4 was explained by the occupation of exchangeable sites by dissolved cationic species such as Al and Fe from granite and biotite in low-pH conditions. Granites are complex mineral assemblages. However, the combined microscopic and macroscopic approaches revealed that elementary reactions by a single mineral phase can be representative of the bulk sorption reaction in complex mineral assemblages.

en: Environmental Science and Technology

ja: Environmental Science and Technology


en: Hydrochemical Changes Associated with Construction of Mizunami Underground Research Laboratory

ja: 瑞浪超深地層研究所の建設に伴う地下水水質の変化

en: Japan Atomic Energy Agency has undertaken the Mizunami Underground Research Laboratory (MIU) Project at Gifu Pref., central Japan. The aims of the project are to establish methodologies for investigation, analysis, and assessment of the deep geological environment, and to develop engineering techniques for deep-underground applications. The MIU consists of two vertical shafts and a number of horizontal tunnels connecting the two shafts. In this study, hydrochemical properties were monitored continuously to evaluate the hydrochemical changes during the MIU construction. The study demonstrated that groundwater salinity changed in relation to the variation of groundwater-flow conditions as a result of the shaft construction. In particular, "up-coning" of the salinity profile was observed at the bottom of the shafts owing to the upward movement of deeper groundwater. The intensity of up-coning was irregular, and depended on the hydrogeological heterogeneity of the groundwater system. Although pH rose to around 12 due to interaction with the concrete lining the shafts and with the grout injected into the adjacent host rock, it decreased to below 10 in less than 2 years. The redox condition remained reducing, which is considered to be controlled by Fe2+/Fe(OH)3(am) and/or SO4 2-/FeS2 couples. These findings can be summarized in a conceptual model.

en: Transactions of the Atomic Energy Society of Japan

ja: 日本原子力学会和文論文誌


en: Abundances of rare earth elements in crude oils and their partitions in water

en: Geochemical Journal


en: EXAFS study on the cause of enrichment of heavy REEs on bacterial cell surfaces

en: Geochimica et Cosmochimica Acta

ja: Geochimica et Cosmochimica Acta


en: Evaluation of behavior of rare earth elements based on determination of chemical state in groundwater in granite

en: Proceedings of the ASME 13th International Conference on Environmental Remediation and Radioactive Waste Management


en: Development of New Ultrafiltration Techniques Maintaining In-Situ Hydrochemical Conditions for Colloidal Study

ja: Proceedings of the ASME 13th International Conference on Environmental Remediation and Radioactive Waste Management


en: Systematic change in relative stabilities of REE-humic complexes at various metal loading levels


en: Speciation of Iron in Humic Substances by X-ray Absorption Fine Structure and Its Effect on the Complexation between Humic Substances and Trace Metal Ions

en: Chemistry Letters

ja: Chemistry Letters


en: High-sensitive measurement of uranium LIII-edge X-ray absorption near-edge structure (XANES) for the determination of the oxidation states of uranium in crustal materials

en: Applied Geochemistry

ja: Applied Geochemistry


en: Systematics of Stability Constants of Fulvate Complexes with Rare Earth Ions


en: 四国の梶ヶ森山頂における樹氷，降雪，冬期降雨中の粒子状物質と黒色浮遊性物質

ja: 四国の梶ヶ森山頂における樹氷，降雪，冬期降雨中の粒子状物質と黒色浮遊性物質

en: Natural Science Research, Faculty of Integrated Arts and Sciences, The University of Tokushima

ja: 徳島大学総合科学部自然科学研究