Determination of thoria in thorium ores by an emission spectrographic method.
The emission spectrograph is used to determine thoria in monazite sand. A sample of only 15 mg is required and yields rapid and accurate results for 2% thoria or less. Of various additives tested as carriers, carbon and MoO(3) were found to be best. A current of 6 A gave a proper rate of volatilization without excessive spattering. The 267.28 nm Mo line was used as internal standard and the 269.24 nm Th line for analysis. Silica and iron sulphide were used as matrix in synthetic samples. Results compared well with those obtained by wet-analysis.
Kothari
N C
NC
Department of Engineering James Cook University of North Queensland Townsoille, Queensland Australia.