Determination of calcium in samarium-cobalt permanent magnet alloyby air-acetylene flame atomic absorption spectrometry
LIU Xiao-jie1,2,3,WANG Yan-xia4,YU Yong-hai1,2,3
1. Baotou Research Institute of Rare Earths, Baotou 014030, China; 2. Ruike National Engineering ResearchCenter of Rare Earth Metallurgy and Function Materials, Baotou 014030, China; 3. State Key Laboratory ofBaiyunebo Rare Earth Resource Researches and Comprehensive Utilization, Baotou 014030, China; 4. Baotou Light Industry Vocational Technical College, Baotou 014035, China
Abstract：The sample was decomposed with aqua regia. The calibration curve was prepared by standard addition method in 3% (V/V) hydrochloric acid medium. A determination method of calcium in samarium-cobalt permanent magnet alloy by air-acetylene flame atomic absorption spectrometry (FAAS) was established. The influence of samarium and cobalt on determination was investigated whether samarium and cobalt exist single or together. The results showed that the matrix effect of samarium and cobalt was complex and could not be ignored if the content of calcium in samarium-cobalt permanent magnet alloy was determined by flame atomic absorption spectrometry. Therefore, the standard addition method was used to correct the influence of matrix effect of samarium and cobalt on determination. The detection limit of method was 13μg/g. The low limit of determination was 44μg/g. The interference tests indicated that the interference of coexisting elements in sample including copper, iron and zirconium could be ignored when the content of calcium in samarium-cobalt permanent magnet alloy was determined by correction mode of standard addition method. The proposed method was applied for determination of calcium with mass fraction of 0.0065% in actual sample of samarium-cobalt permanent magnet alloy. The results were consistent with those obtained by national standard method, i.e., GB/T 12690.15—2006 (inductively coupled plasma atomic emission spectrometry). The relative standard deviation (RSD, n=11) of determination results was less than 14%. The proposed method could be used for the analysis of calcium with mass fraction in range of 0.0050%-0.50% in samarium-cobalt permanent magnet alloy sample.
邓海虹,金风英.火焰原子吸收光谱法测定铁氧体永磁材料中钙的研究[J].矿冶,2003(3):89-91.DENG Hai-hong,JIN Feng-ying.Determination of calcium in a permanent ferrimagnets by flame atomic absorption spectrometry[J].Mining & Metallurgy,2003(3):89-91.
[2]
林建原,夏静芬,黄志勤.火焰原子吸收光谱法测定高纯稀土氧化物中钙[J].稀土,2009,30(1):67-75.LIN Jian-yuan,XIA Jing-fen,HUANG Zhi-qin.Determination of calcium in high pure rare earth oxides by flame atomic absorption spectrometry[J].Chinese Rare Earths,2009,30(1):67-75.
[3]
孔祥平,王娟.武侠.火焰原子吸收光谱法测定乳酸菌发酵虾壳液中钙量[J].理化检验:化学分册,2011(8):944-946.KONG Xiang-ping,WANG Juan,WU Xia.FAAS Determination of calcium in shrimp shell liquor fermented by lactobacilli[J].Physical Testing and Chemical Analysis Part B:Chemical Analysis,2011(8):944-946.
王家风,默丽萍,周正敏.电感耦合等离子体发射光谱法测定氧化钐中非稀土杂质铜、铁、钙、镍[J].光谱学与光谱分析,1998(1):70-72.WANG Jia-feng,MO Li-ping,ZHOU Zheng-min.Determination of non-rare earth impurities including Cu,Fe,Ca and Ni in samarium oxide by ICP-AES[J].Spectroscopy and Spectral Analysis,1998(1):70-72.
