ANALYSIS OF GLASSES FROM THE V2O5-AS2O3-BAO SYSTEM USING INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY

Glasses from the V2O5-AS2O3-BaO phase equilibrium system are interesti ng for applications in the production of thermistors and electron mult iplier channels. The high volatilization rates of arsenic during the m elting process make it necessary to carry out chemical analysis of the glasses in order to locate the final composition in the glass-formati on area in the corresponding phase equilibrium system. Inductively cou pled plasma atomic emission spectrometry is proposed for determining V 2O5, AS2O3 and BaO. A sodium hydroxide procedure was used to separate the main components from the impurities. The only spectral interferenc e produced is due to the V I emission at 193.682 nm, which overlapped partly with 193.698 nm of As I. The analyses were carried out by using an internal standard Sc II at 361.384 nm. The determination of analyt ical short-term precision and precision of the method was also carried out. The relative standard deviations were 0.53, 1.19 and 0.80 for V2 O5, AS2O3 and BaO, respectively. The results obtained were compared wi th those obtained using gravimetry for As and Ba and spectrophotometry for V.