Chemical analysis methods of silicon-based rare earth ferroalloy and RE-Mg ferro-silicon alloy—Part 1: Determination of total rare earth and fifteen rare earth elements contents
Methods for chemical analysis of tungsten concentrates—Part 1：Determination of tungsten trioxide content—Ammonium tungstate igniting gravimetric method
Methods for chemical analysis of tungsten concentrates—Part 4：Determination of sulfur content—High frequency-infrared absorption method and combustion-iodometric method
Methods for chemical analysis of tungsten concentrates—Part 15：Determination of bismuth content—Hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry
Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 1：Determination of carbon and sulfur contents—High frequency-infrared absorption method
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