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Journal Articles

Comparison of the extractabilities of tetrachloro- and tetrabromopalladate(II) ions with a thiodiglycolamide compound

Narita, Hirokazu*; Maeda, Motoki*; Tokoro, Chiharu*; Suzuki, Tomoya*; Tanaka, Mikiya*; Motokawa, Ryuhei; Shiwaku, Hideaki; Yaita, Tsuyoshi

Analytical Sciences, 33(11), p.1305 - 1309, 2017/11

 Times Cited Count:8 Percentile:38.02(Chemistry, Analytical)

Journal Articles

Selective extraction of Pt(IV) over Fe(III) from HCl with an amide-containing tertiary amine compound

Maeda, Motoki*; Narita, Hirokazu*; Tokoro, Chiharu*; Tanaka, Mikiya*; Motokawa, Ryuhei; Shiwaku, Hideaki; Yaita, Tsuyoshi

Separation and Purification Technology, 177, p.176 - 181, 2017/04

 Times Cited Count:18 Percentile:62.51(Engineering, Chemical)

Oral presentation

A Study on the water purification mechanism in the mill tailings pond in Ningyo-toge Environmental Engineering Center

Masunaga, Kosuke; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

In Ningyo-toge Environmental Engineering Center, water level of mill tailings pond is planned to be lowered to reduce overflow risks caused by heavy rain etc., as a part of remediation activities of the Uranium Mine. It is known that the concentration of Fe and As and other elements in the mine drainage are decreased by retaining in the pond. The aims of this study are to reduce the load of water treatment facility and to determine the efficient countermeasure method for remediation of the mill tailings pond. To accomplish these, purification mechanisms of Fe and As in the pond were investigated, referring other studies. Chemical composition of water drainage in the pond was estimated by the chemical equilibrium analysis with advection using PHREEQC. The result of the simulation was almost reproducible for Fe. For As, it was reproducible when taking into account of surface complexation to ferrihydrite in sediment in the bottom of the pond.

Oral presentation

Geo-fluid analysis of the natural purification mechanism of Yotsugi mill tailings pond

Kawasaki, Yohei*; Granata, G.*; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

Arsenic in mine wastewater is an important issue in environmental research. In this study, to better understand the phenomena involved in the removal of arsenic from wastewater, the dynamic behavior of arsenic in the Yotsugi Mill Tailings Pond at Ningyo-toge mine was investigated. By utilizing geosphere fluid modeling software (GETFLOWS), we first reproduced the overall area flow through the advection-dispersion of non-reactive silicate ion with assuming the groundwater inlet. Following this, the total concentrations of arsenic and iron were reproduced by including in the previous advection-dispersion model, the first order kinetics for oxidation of As(III) and Fe(II) along with the precipitation equilibrium of Fe(III) as ferrihydrite. Finally, the adsorption of As(V) or As(III) on ferrihydrite was included in the simulation by considering the surface complexation model previously validated in batch adsorption tests. The results highlighted the natural oxidation of Fe(II) to Fe(III) and the subsequent precipitation of Fe(III) as ferrihydrite. Furthermore, the as-precipitated ferrihydride exhibited a strong ability to remove the arsenic by adsorption. The results also emphasized that the oxidation of As(III) to As(V) and the competitive adsorption between arsenic and the natural phosphates in water, play a key role in the natural removal of the arsenic in the pond.

Oral presentation

Oral presentation

Geo-fluid analysis for the natural purification mechanism of Arsenic and Iron in Yotsugi mill tailings pond

Kawasaki, Yohei*; Yagisawa, Makoto*; Fukuta, Hiroki*; Granata, G.*; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

Oral presentation

Tracer analysis in Yotsugi mill tailings pond by Geo-fluid simulation

Kawasaki, Yohei*; Yagisawa, Makoto*; Fukuta, Hiroki*; Granata, G.*; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Geochemical-fluid analysis for the natural purification mechanism of arsenic and iron in Ningyo-toge mill tailings pond

Kawasaki, Yohei*; Yagisawa, Makoto*; Granata, G.*; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Geo-fluid modeling of the natural purification mechanism of Ningyo-toge mill tailings pond

Kawasaki, Yohei*; Granata, G.*; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

Oral presentation

Application of hydro-chemical coupled simulator for control work design to reduce polluted water in Ningyo-toge uranium mine

Tawara, Yasuhiro*; Yoshida, Takafumi*; Matsuura, Taichi*; Fukazawa, Soki*; Tokoro, Chiharu*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

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