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 

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.