1.Baotou Research Institute of Rare Earth,Baotou 014030,China; 2.National Engineering Research Center of Rare Earth Metallurgy and Functional Materials,Baotou 014030,China
Abstract：A new determination method of carbon in rare earth based hydrogen storage alloy by high frequency combustion infrared absorption method was established with iron, tungsten and tin as flux. The results showed that: the inside surface of crucible was smooth after roasting and the relative standard deviations (RSD, n=5) were less than 2% when the analytical current was 165-175 mA; the RSDs (n=5) were less than 3% when the sample mass was in range of 0.15-0.30 g; the inside surface of crucible was smooth when the flux was 0.5 g of iron-0.9 g of tungsten-0.1 g of tin, and the RSDs (n=6) was 1.9%. The detection limit of method was 0.000 225%, and the low limit of determination was 0.000 751%. The experimental method was applied to the determination of actual sample of rare earth based hydrogen storage alloy. The RSDs (n=11) were between 1.9% and 3.4%. The recovery test was conducted by adding barium carbonate into rare earth based hydrogen storage alloy actual sample. The recoveries were between 99% and 105%.
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