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Sr using 
Sr/
Sr isotope dilution methodYanagisawa, Kayo*; Odashima, Mizuki*; Matsueda, Makoto; Furukawa, Makoto*; Takagai, Yoshitaka*
Talanta, 244, p.123442_1 - 123442_7, 2022/07
The determination of a low concentration of Sr was achieved by the combination of online SPE-ICP-QMS and ID method using Sr/Sr ratio. No requirement of radioactive standard material and the preparation process of the calibration curve was in the quantification process and data acquisition can be in one-shot sample injection. The proposed method allowed the rapid (within 15 min/sample) quantification of Sr in the presence of significant interferences such as isobaric Zr and other elements. The LOD for Sr was 5.6 Bq/L for a 10 mL injection and this could be improved by simply increasing the sample volume injected.
Matsueda, Makoto; Yanagisawa, Kayo*; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Abe, Hironobu; Kitamura, Akihiro; Takagai, Yoshitaka*
ACS Omega (Internet), 6(29), p.19281 - 19290, 2021/07
Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)Online solid-phase extraction-inductively coupled plasma-quadrupole mass spectrometry with oxygen dynamic reaction cell (online SPE-ICP-MS-DRC) was shown to be a thorough automatic analytical system, circumventing the need for human handling. At three stepwise separations (SPE-DRC-Q mass filters), we showed that interference materials allowed the coexistence of abundance ratios of 1.5
10
for 
Tc/Mo. Using this optimized system, a detection limit of Tc was 9.3 pg/L (5.9 mBq/L) for a 50 mL injection and sequential measurements were undertaken at a cycle of 24 min/sample.
Matsueda, Makoto; Takagai, Yoshitaka*
Bunseki, 2021(4), p.160 - 161, 2021/04
no abstracts in English
Sr using automatic solid-phase extraction inductively coupled plasma mass spectrometryYanagisawa, Kayo*; Matsueda, Makoto; Furukawa, Makoto*; Takagai, Yoshitaka*
Analytical Sciences, 36(9), p.1131 - 1135, 2020/09
Times Cited Count：2 Percentile：41.67(Chemistry, Analytical)In this paper, we propose an online water infusion system for rapid quantification of radioactive strontium-90 (Sr) with inductively coupled plasma mass spectrometry coupled solid-phase extraction and O
dynamic reaction (cascade ICP-MS). The proposed system automatically provides a higher dilution ratio, which is at most 3.3 times the ratio obtained by the previous method, without increasing the analysis time (within 15 min). A detection limit of 2.7 Bq/kg wet (0.54 pg/kg wet) was achieved. The recovery test results were consistent with two different spiked values.
Takagai, Yoshitaka*; Furukawa, Makoto*; Kameo, Yutaka; Matsueda, Makoto; Suzuki, Katsuhiko*
Bunseki Kagaku, 66(4), p.223 - 231, 2017/04
Times Cited Count：5 Percentile：28.23(Chemistry, Analytical)no abstracts in English
Takagai, Yoshitaka*; Furukawa, Makoto*; Kameo, Yutaka; Suzuki, Katsuhiko*
Isotope News, (721), p.2 - 7, 2014/05
no abstracts in English
Takagai, Yoshitaka*; Furukawa, Makoto*; Kameo, Yutaka; Suzuki, Katsuhiko*
Analytical Methods, 6(2), p.355 - 362, 2014/01
Times Cited Count：52 Percentile：97.46(Chemistry, Analytical)Radioactive strontium-90 (Sr) scattered by nuclear power plant accident was specifically determined by conventional inductively coupled plasma quadrupole mass-spectrometry (ICP-QMS) preceded by on-line chelate column separation and oxygen reaction. After implementing the cascade-step, the detection limit (DL) of quantitative ICP-QMS of Sr from spiked water samples was 2.85 Bq/L (equivalent to 0.56 ppq). Analysis of microwave-digested soil yielded a DL of 4.73 Bq/kg (equivalent to 0.93 ppq). The Sr from environmental contaminated soil samples ranged from 63 Bq/kg to 89 Bq/kg, with no statistical difference between the proposed and general methods at 98% confidence level.
U and 
U nuclide using a microwave digestion associated with ICP-MS and the large areal soil survey related to Fukushima Daiichi Nuclear DisasterTakagai, Yoshitaka*; Furukawa, Makoto*; Nagahashi, Yoshitaka*; Takase, Tsugiko*; Shikino, Osamu*; Kameo, Yutaka
Bunseki Kagaku, 60(12), p.947 - 957, 2011/12
Times Cited Count：12 Percentile：41.96(Chemistry, Analytical)Isotope ratio analysis for U and U in soil samples using a microwave digestion procedure associated with ICP-MS was proposed and demonstrated. In the microwave digestion procedure, the dissolution of natural uranium in silicate (in rocks) was reduced by using a mixture of nitric acid and hydrogen peroxide (to measure the radioactive uranium from a disaster). Upon ICP-MS, the isotope ratio of the certificated geochemical reference material was realized to precisely correct the isotope ratio in real soil samples. In addition, cell-pass voltages can be available to make calibrations and/or to correct the mass bias in the mass-spectrometer. By these effects, the isotope ration of uranium can be measured with an accuracy of 0.37% without using a radioactive standard source. U and U were quantitatively determined, and those detection limits were both 0.010 
g/kg. In the case of an emergency, like a nuclear hazard, the proposed method is useful to immediately gather a large amount of information in large area as compared with a common method such as a complete dissolution process associated with an 
-ray spectrometer or ICP-MS. In addition, the survey of how radioactive uranium spreads was conducted from 7 to 80 km around the Fukushima Daiichi Nuclear Power Plant (Fukushima-DNPP) (115 points in Fukushima prefecture). As a result, the values of the uranium isotope ratio for those soils were similar to the natural abundance, although the various concentrations of uranium were detected from sampling points.
Aoki, Jo; Abe, Miki*; Butsugan, Michio*; Onuma, Chisa*; Fujiwara, Kenso; Takagai, Yoshitaka*
no journal, ,
Safety management of high dose radioactive wastes such as debris is an important issue in dealing with decommissioning Fukushima Daiichi Nuclear Power Plant. Zeolites currently used as adsorbents for radioactive wastes show high selectivity only to alkali metal ions. Therefore, in this study, using DFB-EG80 (S), which desferrioxamine B was immobilized on a micropolymer and forms a stable complex with high-valent metal ions, examined adsorption of zirconium (Zr) ions and hafnium (Hf) ions, in a strong acid solution. As an experimental method, 3 mg of DFB-EG80(S) and 10 mL of 52 kinds of metal elements of 10 ppb were added to disposable centrifuge tubes, and shake at 50 degrees, 160 rpm for 20 minutes in a shaking constant temperature bath. As a result, it was possible to adsorb up to 96.7 % and 97.9 % of Zr and Hf ions. In addition, it became possible to separate 52 elements into 4 elements of Zr, Hf, Nb and Ta. In addition, it became possible to separate 52 elements into 4 elements of Zr, Hf, Nb and Ta under shaking conditions of 70 degrees.
Okazaki, Kodai*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Otaka, Masahiko; Makuuchi, Etsuyo*; Oishi, Yuji*; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
Matsueda, Makoto; Yanagisawa, Kayo*; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Abe, Hironobu; Kitamura, Akihiro; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
Nakagawa, Taichi; Suzuki, Reika*; Matsueda, Makoto; Terashima, Motoki; Iijima, Kazuki; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
Suzuki, Reika*; Nakagawa, Taichi; Matsueda, Makoto; Abe, Yuta; Hirata, Takafumi*; Furukawa, Makoto*; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
Suzuki, Reika*; Nakagawa, Taichi; Matsueda, Makoto; Takase, Tsugiko*; Hirata, Takafumi*; Abe, Yuta; Terashima, Motoki; Furukawa, Makoto*; Takagai, Yoshitaka*
no journal, ,
no abstracts in English
