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Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Kuno, Takehiko; Takamura, Yuzuru*
Spectrochimica Acta, Part B, 155, p.134 - 140, 2019/05
Times Cited Count：5 Percentile：41.96(Spectroscopy)The emission spectra of technetium (Tc) by liquid electrode plasma optical emission spectrometry have been investigated in this study. From the spectra, 52 emission peaks of Tc were observed in the 250-500 nm wavelength range. All peaks were assigned to the neutral state or singly ionized state. The relative intensities of these peaks were similar to those excited by an electric spark. The strongest intensity peaks were found at 254.3 nm, 261.0 nm, and 264.7 nm. Spectral interferences of coexisting elements in highly active liquid waste of reprocessing stream on those three strongest peaks were investigated using simulated sample. No spectral interferences were observed around the 264.7 nm Tc peak. Therefore, analytical performance using 264.7 nm peak was evaluated. The detection limit, estimated on standard and blank samples in 0.4 M nitric acid, was 1.9 mg/L. The relative standard deviation of Tc standard sample (12.0 mg/L) was 3.8% (N = 5, 1
).
Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo; Takamura, Yuzuru*; Surugaya, Naoki; Kuno, Takehiko
Talanta, 183, p.283 - 289, 2018/06
Times Cited Count：10 Percentile：39.53(Chemistry, Analytical)We develop a novel analytical method employing liquid electrode plasma optical emission spectrometry for measurement of total cesium in highly active liquid wastes. Limit of detection and limit of quantification are 0.005 mg/L and 0.02 mg/L, respectively. The method is validated and applied to the real samples.
Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo; Kuno, Takehiko; Surugaya, Naoki; Takamura, Yuzuru*
no journal, ,
Commercial ICP AES is often applied for analysis of radioactive nuclides present in the waste stream. However, the instrument is bulky with auxiliary equipment. Consequently, it is difficult to maintain or replace those instruments in a shielded cell or a glove box. A novel liquid electrode plasma (LEP) would be a suitable option instead of ICP. LEP is compact to be easily installed, maintained and operated in a shielded cell or a glove box because the method does not require plasma gas, a nebulizer or large power supply. LEP allows only 
L-level waste emission due to the use of microchannel. In the study, we utilized LEP as an excitation source for analysis of radioactive nuclides. The newly installed instrument was characterized by determining cesium and strontium in a highly active waste simulated sample. The obtained result is promising for further application of LEP in the field of radiochemical analysis.
Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo; Inada, Satoshi; Takamura, Yuzuru*; Kuno, Takehiko
no journal, ,
A simple and rapid method for determination of Cs and Tc in highly radioactive liquid waste (HALW) using liquid electrode plasma (LEP) has been developed. Effects of pulsed voltage sequence and nitric acid concentration on emissions of these elements are investigated. The method is applied to the quantitative analysis of Cs and Tc in HALW samples at Tokai reprocessing plant.
Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo; Takamura, Yuzuru*; Kuno, Takehiko
no journal, ,
We report a new analytical method for determination of strontium in highly active liquid waste, which employs liquid electrode plasma optical emission spectrometry (LEP-OES) following online solid phase extraction (SPE). The homemade SPE column is constructed by packing Sr selective resin into a 30-cm long resin tube, which can be reused for tens of times. Preconcentration factor is estimated about 15. Total time for one measurement is 1.5 hours. The developed method is validated with the measurement of simulated HALW. We suppose that the method is able to measure 10000-fold diluted HALW with a volume of 5 mL.
Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo; Inada, Satoshi; Takamura, Yuzuru*; Kuno, Takehiko
no journal, ,
An analytical technique for determination of elemental strontium in highly radioactive liquid waste (HALW) using liquid electrode plasma optical emission spectrometry (LEP-OES) has been developed. We use the LEP-OES instrument that is installed recently. Measurement condition including voltage and sample acidity is optimized. The method is validated using simulated HALW and comparing with inductively coupled plasma spectrometry (ICP-OES). The measurement of real HALW is being carried out.
Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo*; Kuno, Takehiko; Sato, Soichi; Takamura, Yuzuru*
no journal, ,
Inductively coupled plasma optical emission spectrometry (ICP-OES) is widely considered as a routine elemental analytical method. However, the necessity of cooling system and plasma gas makes the method difficult in maintenance and repair once it is installed in a glove box for analysis of radioactive samples. Our study is applying liquid electrode plasma optical emission spectrometry (LEP-OES), which requires no plasma gas, nor cooling system, to highly active liquid wastes (HALW). The applications of the method for Cs, Sr, Na, K, Tc has been examined and reported in this presentation.
