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Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Kuno, Takehiko; Takamura, Yuzuru*
Journal of Radioanalytical and Nuclear Chemistry, 327(1), p.433 - 444, 2021/01
Times Cited Count：0 Percentile：0.01(Chemistry, Analytical)A simple, practical, and reliable analytical method for determination of Na, K, Ca, Sr, and Ba by liquid electrode plasma optical emission spectrometry is developed. Appropriate emission lines for quantification, interferences from co-existing elements, and effect of measurement conditions with cell damage have been investigated. The spike and recovery tests using actual sample have been performed for method validation, and negligible sample matrix effect has been observed. Consequently, the method is successfully applied to several radioactive wastes. The obtained data have been agreed well with data from computer calculation and inductively coupled plasma optical emission spectrometry within 10% difference.
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.
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.
Do, V. K.
no journal, ,
In this study, an ultra compact device for analysis of radioactive element has been developed by liquid electrode plasma optical emission spectrometry (LEP-OES) which can be possible to miniaturize the analytical equipment. The applied voltage with its sequence and nitric acid concentration are optimized and then cesium (Cs), strontium (Sr) and technetium (Tc) are measured. It is found that Cs, Sr and Tc are determined within the concentration range from ppm to ppb. Also, Cs and Sr concentration in real highly active liquid waste (HALW) are determined. The concentration of Cs and Sr in HALW agree well with the value of ORIGEN calculation. Moreover, Sr-resin from Eichrom Technology is used for solid phase extraction preconcentration and combined with LEP-OES. It is found that Sr can be preconcentration to a factor of 15 and Sr in simulated HALW are measured with the volume of 5 mL.
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.
Kodaka, Noriyasu; Yamamoto, Masahiko; Kuno, Takehiko; Takamura, Yuzuru*
no journal, ,
The K, Ca, Mg, Na, Fe, Cr, and Ni in plutonium (Pu) nitrate solution were determined by liquid electrode plasma optical emission spectrometry (LEP-OES). Since the emission line of Pu interfered the emission line of the target element in ICP-OES, removal of Pu was necessary in advance to the measurement. Contrastly, Pu emission lines were not observed, when Pu nitrate solution was measured by LEP-OES. However, emission of K, Ca, Mg, Na, Fe, Cr, and Ni was observed. Therefore each element were determined. It was found that trace elements in Pu nitrate solution can be quantified by LEP-OES without the Pu separation.
Yamamoto, Masahiko; Kuno, Takehiko; Takamura, Yuzuru*
no journal, ,
Target elements are separated and measured in a glove box (GB) to prevent internal exposure when radioactive material is analyzed. Although liquid-liquid solvent extraction is used for the separation, liquid waste reduction is required due to the organic solvents. Also, an large apparatus such as ICP-OES requires high cost due to the designing sepcific GB for installation. Therefore, small apparatus is desired. In this study, we have been focused on microchemical chip (MCC) and liquid electrode plasma (LEP). Reduction of liquid radioactive waste is expected becuase solvent extraction can be performed in microchannel by using MCC. The emission spectroscopy using LEP (LEP-OES) requires neither plasma gas nor cooling water, and the device is small enough to installed in normal GB. We will report the results of the Pu measurement system combining MCC with liquid scintillation counter, and elemental analysis of liquid radioactive waste by LEP-OES.
