Kenta Iwane's research while affiliated with Keio University and other places
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Publications (3)
In the Tamagawa geothermal area of Akita Prefecture, northern Japan, Obuki spring discharges a large amount of thermal water (∼9000 L/min), which is chloride-rich and acidic (pH 1.2). We have investigated changes in the physico-chemical nature and fractionation mechanisms of rare earth elements (REEs) including Y and actinides (Th and U) in the Shi...
The Kusatsu and Tamagawa hot springs contain both toxic elements and rare metals used in high-technology industries. High acidity and significant discharge of these springs have led to the construction of dams and neutralization of spring waters by lime addition. However, the same neutralization process causes differing effects in the Kusatsu and T...
The Obuki spring is the largest and most acidic of the Tamagawa hot springs (Akita Prefecture, northern Japan), and it discharges ca. 9000 L/min of chloride-rich acidic water (pH 1.2) that contains high concentrations of both As and rare metals such as Ga and In. This paper aims to quantify seasonal variations in the mobility of these elements in t...
Citations
... Several comprehensive reviews of surficial weathering of iron sulfide ore-derived mine tailings in a semi-arid environment have been published over the past decades (Blowes and Jambor, 1990;Jambor, 1994;Jambor and Blowes, 1998;Lindsay et al., 2015). Previous studies have also investigated the geochemical mobility of metals, aqueous rare earth elements, and actinides (i.e., U and Th) in the natural aquatic system (Ogawa et al., 2021;Ogawa et al., 2019). The REEs patterns in groundwater result from complex solid-water interactions and can be applied as process indicators of a post-mining area (Grawunder et al., 2018). ...
... The Yukawa River was examined during three sampling periods (December 2015, and March and September 2019). The geochemical behavior of As and rare metals, such as Ga and In, in this area in February 2009 have been reported previously (Ogawa et al., 2013(Ogawa et al., , 2018. ...
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... Thus, only dissolved species were expected to remain in the sampled waters. In support of this conclusion, a significant difference was not found between the concentrations of the metals in in-situ filtration fractions using 0.2 and 0.45 μm filters and in the ultra-filtration fractions in the case of the river affected by the acidic Tamagawa thermal water (Ogawa et al., 2012). The filtrates were acidified with HNO 3 (0.5 mL HNO 3 to 70 mL sample) and stored in polypropylene bottles that had been pre-washed with a solution of ~3% HNO 3 , except fractions for anion analyses. ...
