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Journal Articles

Spectrochemistry of technetium by liquid electrode plasma optical emission spectrometry and its applicability of quantification for highly active liquid waste

Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Kuno, Takehiko; Takamura, Yuzuru*

Spectrochimica Acta, Part B, 155, p.134 - 140, 2019/05

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$$sigma$$).

Journal Articles

Quantitative determination of total cesium in highly active liquid waste by using liquid electrode plasma optical emission spectrometry

Do, V. K.; Yamamoto, Masahiko; Taguchi, Shigeo; Takamura, Yuzuru*; Surugaya, Naoki; Kuno, Takehiko

Talanta, 183, p.283 - 289, 2018/06

 Times Cited Count:1 Percentile:62.19(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.

Oral presentation

Development of an ultra compact device using liquid electrode plasma for radioactive element analysis

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 $$mu$$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.

Oral presentation

Development of analytical method for metal elements in reprocessing solution by optical emission spectrometry based on liquid electrode plasma, 2; Determination of cesium and technetium in highly active liquid waste

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.

Oral presentation

Development of analytical method for metal elements in reprocessing solution by optical emission spectrometry based on liquid electrode plasma, 1; Liquid electrode plasma optical emission spectra of reprocessing solution

Taguchi, Shigeo; Do, V. K.; Yamamoto, Masahiko; Inada, Satoshi; Takamura, Yuzuru*; Kuno, Takehiko

no journal, , 

Optical emission peaks of main FP such as Tc and Cs, and Fe were observed in spectra of simulated highly active liquid waste based on liquid electrode plasma. It was found that this optical emission spectrometry based on liquid electrode plasma could be applied to analysis for reprocessing solution.

Oral presentation

Determination of strontium in highly active liquid waste (HALW) by solid phase extraction (SPE) tandem liquid electrode plasma optical emission spectrometry (LEP-OES)

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.

Oral presentation

Development of analytical methods for metal elements in reprocessing solution by optical emission spectrometry based on liquid electrode plasma, 3; Determination of technetium in reprocessing process solution

Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Inada, Satoshi; Takamura, Yuzuru*; Kuno, Takehiko

no journal, , 

In this research, we focused on liquid electrode plasma optical emission spectrometry(LEP-OES), which is effective method to minimize the analytical device, to determine technetium (Tc) in reprocessing solution. Measurement conditions such as applied voltage, output pulse sequence and nitric acid concentration were optimized. Consequently, measurement condition at voltage of 1000V, pulse width of 2ms, pulse interval of 8ms, pulse number of 50 and nitric acid concentration of 0.4M offers the high peak intensity with good reproducibility. Also, interference of coexisting elements in sample from reprocessing steam was investigated for Tc peak at 254.3nm, 261.0nm, 264.7nm. The spectral interference of iron was observed at Tc peak of 254.3nm and 261.0nm although no spectral interference were observed at 264.7nm peak. It was found that determination of Tc by LEP-OES can be possible using this peak.

Oral presentation

Development of analytical methods for metal elements in reprocessing solution by optical emission spectrometry based on liquid electrode plasma, 4; Determination of strontium in highly active liquid waste

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.

Oral presentation

Removal of alpha-ray emission nuclide from plutonium solution in reprocessing plant by solid phase extraction method for the analysis of metal impurities

Taguchi, Shigeo; Furuse, Takahiro*; Masaki, Yuji*; Inada, Satoshi; Takamura, Yuzuru*; Kuno, Takehiko

no journal, , 

The analytical procedure to separate from the impurity metals was established by adsorption of Pu and Am using TRU resin to analyze the impurity metal in Pu nitrate solution recovered from spent nuclear fuel.

Oral presentation

Development of analytical methods for metal elements in reprocessing solution by optical emission spectrometry based on liquid electrode plasma, 5; Determination of alkaline and alkaline earth metals in reprocessing process solution

Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Takamura, Yuzuru*; Kuno, Takehiko

no journal, , 

The measurement conditions of Na, K, Ca, Sr, Ba by liquid electrode plasma optical emission spectrometry (LEP-OES) have been optimized. The samples from reprocessing process plant such as highly active liquid waste has been also measured by LEP-OES.

Oral presentation

Liquid electrode plasma optical emission spectrometry and its applicability to analysis of radioactive samples

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.

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