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Featured researches published by Tatsuhiko Tanaka.


Talanta | 2007

Precise coulometric titration of sodium thiosulfate and development of potassium iodate as a redox standard

Toshiaki Asakai; Mariko Murayama; Tatsuhiko Tanaka

In this paper, we determine the effective purity of potassium iodate as a redox standard with a certified value linked to the international system of units (SI units). Concentration measurement of sodium thiosulfate solution was performed by precise coulometric titration with electrogenerated iodine, and an assay of potassium iodate was carried out by gravimetric titration based on the reductometric factor of sodium thiosulfate assigned by coulometry. The accuracy of the coulometric titration method was evaluated by examining the current efficiency of iodine electrogeneration, stability of sodium thiosulfate solutions and dependence on the amount of sodium thiosulfate solution used. The measurement procedure for gravimetric titration of potassium iodate with sodium thiosulfate was validated based on determination of a reference material of known purity (potassium dichromate determined by coulometry with electrogenerated ferrous ions) using the same gravimetric method. Solutions of 0.2 and 0.5mol/L sodium thiosulfate were stable over 17 days without stabilizer. Investigation of the dependency of titration results on the amount of sodium thiosulfate solution used showed no significant effects, no evidence of diffusion of the sample, and no effect of contamination appearing during the experiment. Precise coulometric titration of sodium thiosulfate achieved a relative standard deviation of less than 0.005% under repeating conditions (six measurements). For gravimetric titration, the results obtained for the effective purity of potassium dichromate were sufficiently close to its certified value to allow confirmation of the validity of the gravimetric titration was confirmed. The relative standard deviation of gravimetric titration for potassium iodate was less than 0.011% (nine measurements), and a redox standard with a certified value linked to SI units was developed.


Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2011

New method for comprehensive detection of chemical warfare agents using an electron-cyclotron-resonance ion-source mass spectrometer

Masanori Kidera; Yasuo Seto; Kazuya Takahashi; Shuichi Enomoto; Shintaro Kishi; Mika Makita; Tsuyoshi Nagamatsu; Tatsuhiko Tanaka; Masayoshi Toda

We developed a detection technology for vapor forms of chemical warfare agents (CWAs) with an element analysis system using an electron cyclotron resonance ion source. After the vapor sample was introduced directly into the ion source, the molecular material was decomposed into elements using electron cyclotron resonance plasma and ionized. The following CWAs and stimulants were examined: diisopropyl fluorophosphonate (DFP), 2-chloroethylethylsulfide (2CEES), cyanogen chloride (CNCl), and hydrogen cyanide (HCN). The type of chemical warfare agents, specifically, whether it was a nerve agent, blister agent, blood agent, or choking agent, could be determined by measuring the quantities of the monatomic ions or CN(+) using mass spectrometry. It was possible to detect gaseous CWAs that could not be detected by a conventional mass spectrometer. The distribution of electron temperature in the plasma could be closely controlled by adjusting the input power of the microwaves used to generate the electron cyclotron resonance plasma, and the target compounds could be detected as molecular ions or fragment ions, enabling identification of the target agents.


Isij International | 2004

Simple, Rapid and Sensitive Determination of Bismuth in Iron and Steel Based on In-line Preconcentration/separation Directly Coupled with Spectrophotometric Detection in a Continuous Flow System

Takeshi Yamane; Hiroya Ishikawa; Tatsuhiko Tanaka


Analytica Chimica Acta | 2006

Evaluation of certified reference materials for oxidation–reduction titration by precise coulometric titration and volumetric analysis

Toshiaki Asakai; Yoshihiro Kakihara; Yasuharu Kozuka; Sadao Hossaka; Mariko Murayama; Tatsuhiko Tanaka


Analytical Sciences | 2013

Coulometric Titration of Urea with Electrogenerated Hypobromite

Jun Kato; Takuma Koseki; Yukie Aoki; Ayako Yamada; Tatsuhiko Tanaka


Journal of Radioanalytical and Nuclear Chemistry | 2011

Determination of trace amounts of plutonium in low-active liquid wastes from spent nuclear-fuel reprocessing plants by flow injection-based solid-phase extraction/electrochemical detection system

Shigeo Taguchi; Masahiko Yamamoto; Naoki Surugaya; Akira Kurosawa; Toshiaki Hiyama; Tatsuhiko Tanaka


Analytical Sciences | 2006

Investigation of the drying conditions for amidosulfuric acid

Toshiaki Asakai; Ryota Minegishi; Norie Inaba; Yutaka Ishimura; Mariko Murayama; Tatsuhiko Tanaka


Tetsu To Hagane-journal of The Iron and Steel Institute of Japan | 2005

Simultaneous Determination of Trace Tramp Elements (Zn, Pb and Bi) in Steel by Anodic Stripping Voltammetry

Tatsuhiko Tanaka; Yonehiro Masumoto; Yoshitake Noguchi; Hideo Hayashi


Accreditation and Quality Assurance | 2007

Determination of the purity of acidimetric standards by constant-current coulometry, and the intercomparison between CRMs

Toshiaki Asakai; Mariko Murayama; Tatsuhiko Tanaka


Analytical Sciences | 2006

Influence of AgCl Precipitates on the Precipitation Titration of Sodium Chloride by Constant-Current Coulometry

Toshiaki Asakai; Hisao Hara; Mariko Murayama; Tatsuhiko Tanaka

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Mariko Murayama

National Institute of Technology and Evaluation

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Toshiaki Asakai

National Institute of Technology and Evaluation

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Akira Kurosawa

Japan Atomic Energy Agency

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Hideo Hayashi

Tokyo University of Science

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Naoki Surugaya

Japan Atomic Energy Agency

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Shigeo Taguchi

Japan Atomic Energy Agency

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Toshiaki Hiyama

Japan Atomic Energy Agency

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Hidenori Nabekawa

Tokyo University of Science

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Kumi Nishu

Tokyo University of Science

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Atsushi Taguchi

Tokyo University of Science

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