Direct Determination of Trace Impurities in High Purity Neodymium after In-Situ Analyte-Matrix Separation by Fluorination Assisted ETV-ICP-AES  

作　　者：Ruth Wanjau 胡斌 何蔓 江祖成 吴英亮 

机构地区：[1]Kenyatta University, Kenya [2]Department of Chemistry, Wuhan University, Wuhan 430072, China

出　　处：《Journal of Rare Earths》2004年第3期319-322,共4页稀土学报（英文版）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina ( 2 9875 0 2 2 )

摘　　要：Using PTFE as a chemical modifier, a method for the determination of trace impurities in high purity Nd_2O_3 by in-situ separation and electrothermal vaporization-inductively coupled plasma-atomic emission spectrometry (ETV-ICP-AES) was developed. The analyte-matrix separation and the temperature program of graphite furnace were investigated and optimized. The solid samples were directly introduced into graphite furnace in the form of slurry, where selective volatilization between the matrix and the analytes took place. The Nd matrix was retained in the graphite furnace during the evaporation step, while the trace analyte impurities were vaporized and removed. As a result, the matrix interference that is serious without the modifier is suppressed effectively. The achievable detection limits are (μg·g^(-1)): Ti 0.15, Mn 0.15, Ni 0.20, Co 0.54, respectively. The proposed method was applied to direct determination of trace impurities in high purity Nd_2O_3 with satisfactory results.Using PTFE as a chemical modifier, a method for the determination of trace impurities in high purity Nd_2O_3 by in-situ separation and electrothermal vaporization-inductively coupled plasma-atomic emission spectrometry (ETV-ICP-AES) was developed. The analyte-matrix separation and the temperature program of graphite furnace were investigated and optimized. The solid samples were directly introduced into graphite furnace in the form of slurry, where selective volatilization between the matrix and the analytes took place. The Nd matrix was retained in the graphite furnace during the evaporation step, while the trace analyte impurities were vaporized and removed. As a result, the matrix interference that is serious without the modifier is suppressed effectively. The achievable detection limits are (μg·g^(-1)): Ti 0.15, Mn 0.15, Ni 0.20, Co 0.54, respectively. The proposed method was applied to direct determination of trace impurities in high purity Nd_2O_3 with satisfactory results.

关 键 词：chemical analysis FLUORINATION ETV-ICP-AES in-situ separation rare earths 

分 类 号：O657.3[理学—分析化学]