Determination of partition amount of praseodymium, neodymium and gadolinium in praseodymium-neodymium-gadolinium alloy by inductively coupled plasma atomic emission spectrometry
WANG Su-mei1,2, GAO Wa1,2, HAO Qian1,2, YU Ya-hui1,2
1. State Key Laboratory of Rare Earth Resources Research and Comprehensive Utilization, Baotou Research Institute of Rare earths, Baotou 014030, China; 2. Ruike National Engineering Research Center of Rare Earth Metallurgy and Functional Materials, Baotou 014030, China
Abstract：Praseodymium-neodymium-gadolinium metal is a new material of neodymium-iron-boron alloy. It has some advantages such as low harmful elements content, stable product composition and low cost. The rapid and accurate determination of partition amount of praseodymium, neodymium and gadolinium in praseodymium-neodymium-gadolinium alloy is of great importance to the product quality control. The samples were dissolved with nitric acid. Pr 418.948nm, Nd 445.156nm and Gd 342.246nm were selected as the analytical lines. The partition amount of praseodymium,neodymium and gadolinium in praseodymium-neodymium-gadolinium alloy was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) under the optimal analysis conditions of instrument. The effect of sample dissolution condition and coexisting element interference on the determination was discussed. The results showed that the carbide and nitride inclusions in praseodymium-neodymium-gadolinium alloy could be easily dissolved with nitric acid. The influence of coexisting rare earth elements and non-rare earth elements (including iron, calcium, magnesium, aluminum, silicon, molybdenum and tungsten) in sample on the determination of praseodymium, neodymium and gadolinium could be ignored. The proposed method was applied for the determination of partition amount of praseodymium, neodymium and gadolinium in three praseodymium-neodymium-gadolinium alloy samples. The relative standard deviations (RSD, n=11) of determination results were between 0.070% and 0.56%. The partition amount of praseodymium, neodymium and gadolinium in internal control standard sample of praseodymium-neodymium-gadolinium alloy was determined according to the experimental method as well as X-ray fluorescence spectrometry (XRF). The found results of two methods were consistent.
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