Analysis of glasses from the V2O5–As2O3–BaO system using inductively coupled plasma atomic emission spectrometry

Abstract

Glasses from the V₂O₅–As₂O₃–BaO phase equilibrium system are interesting for applications in the production of thermistors and electron multiplier channels. The high volatilization rates of ars enic during the melting process make it necessary to carry out chemical analysis of the glasses in order to locate the final composition in the glass-formation area in the corresponding phase equilibrium system. Inductively coupled plasma atomic emission spectrometry is proposed for determining V₂O₅, As₂O₃ and BaO. A sodium hydroxide procedure was used to separate the main components from the impurities. The only spectral interference 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 analytical 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 V₂O₅, As₂O₃ and BaO, respectively. The results obtained were compared with those obtained using gravimetry for As and Ba and spectrophotometry for V.