Determination of Trace Metal Impurities in Cerium Oxide by Fluorination-Assisted ETV-ICP-AES after HPLC Separation
来源期刊：JOURNAL OF RARE EARTHS2004年第2期
论文作者：江祖成 胡斌 Ruth Wanjau 何蔓 梁沛 秦永超
Key words：chemical analysis; fluorination-electrothermal vaporization; HPLC; P507 resin; cerium oxide; rare earths;
Abstract: A new method for the separation and detection of trace metal impurities in cerium oxide(CeO2)using HPLC combined with electrothermal vaporization(ETV)-ICP-AES was developed.This combination links the high separation power of HPLC and high sensitivity of ETV-ICP-AES.The 2-ethylhexyl hydrogen 2-ethylhexylphosphate(P507)resin was used as stationary phase for the separation of metallic impurities in order to eliminate severe spectral interferences of the matrix.The dilute nitric acid was adopted as mobile phase for eluting Cu,Mn,Ni and La.The separation process can be accomplished in about 30 min.After concentrating the eluate by evaporation,the trace impurities were determined by using ETV-ICP-AES with the addition of 6% PTFE slurry as chemical modifier.The proposed method was applied to the analysis of CeO2 with satisfactory recoveries.
江祖成1，胡斌1，Ruth Wanjau1，何蔓1，梁沛1，秦永超1
(1.Department of Chemistry,Wuhan University,Wuhan 430072,China)
Abstract:A new method for the separation and detection of trace metal impurities in cerium oxide(CeO2)using HPLC combined with electrothermal vaporization(ETV)-ICP-AES was developed.This combination links the high separation power of HPLC and high sensitivity of ETV-ICP-AES.The 2-ethylhexyl hydrogen 2-ethylhexylphosphate(P507)resin was used as stationary phase for the separation of metallic impurities in order to eliminate severe spectral interferences of the matrix.The dilute nitric acid was adopted as mobile phase for eluting Cu,Mn,Ni and La.The separation process can be accomplished in about 30 min.After concentrating the eluate by evaporation,the trace impurities were determined by using ETV-ICP-AES with the addition of 6% PTFE slurry as chemical modifier.The proposed method was applied to the analysis of CeO2 with satisfactory recoveries.
Key words:chemical analysis; fluorination-electrothermal vaporization; HPLC; P507 resin; cerium oxide; rare earths;
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