GB/T 12690.12-2003 "Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of thorium content--Arsenazo III spectrophotometric method and inductively coupled plasma mass spectrum method"

This standard describes the method for the determination of thorium content in rare earth metals and their oxides by arsenazo III Spectrophotometric method, spectra-trophotometry and Inductance coupled plasma Mass spectrometry, which is suitable for the detection of thorium content in the range of 0.0001% to 0.10%. The sample is separated in a dilute muriatic acid medium and the thorium is measured at a wavelength of 650nm. This method is suitable for the analysis of trace impurities in high-purity rare earth materials, especially in scientific research and industrial applications.

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