Method for determining rare-earth impurities in high-purity CeO2 with SACEF (strong acid cation exchange fiber) column based separation and enrichment-ICP (inductively coupled plasma)-AES (atomic emission spectrometry)

Abstract

The invention provides a method for determining rare-earth impurities in high-purity CeO2 with SACEF (strong acid cation exchange fiber) column based separation and enrichment-ICP (inductively coupledplasma)-AES (atomic emission spectrometry). The method comprises steps as follows: (1), a Ce matrix standard stock solution and a rare-earth impurity standard stock solution are prepared; (2), an analytical sample is prepared; (3), an SACEF column is prepared; (4), a to-be-separated pure CeO2 test solution with pH being 3.00 is loaded to the column at a flow velocity being 1.0 mL.min<-1>; the fiber column is firstly pre-eluted with 80 mL of diluent HNO3 with pH being 3.00 and is eluted with 600 mL of an EDTA ammonium solution with pH being 3.00 and concentration being 0.005 mol.L<-1>, the elution flow velocity is controlled to be 1.5 mL.min<-1>, and outflow is received by a 100 mL volumetric flask; in the 600 mL of solution, impurities such as Pr and the like are eluted off; determinationis implemented according to selected working conditions of an instrument; (5), regeneration of the SACEF column is performed. According to the method, SACEF is applied to determination of the rare-earth impurities in high-purity CeO2, the matrix CeO2 is removed through separation, the rare-earth impurities are enriched, spectral interference and non-spectral interference caused by Ce matrix in ICP-AES determination are eliminated, and accuracy of impurity determination is improved.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, in particular to a strong acid cation exchange fiber column separation and enrichment-ICP-AES determination of high-purity CeO 2 The method of medium rare earth impurities. Background technique [0002] In the current development of new materials, high-purity cerium oxide has a wide range of applications. Existing literature reports CeO with a purity of 40–50% 2 The corrosion of the optical surface when polishing the lens is more serious than the corrosion of the optical surface when using high-purity cerium oxide to polish the lens. The reason is: high purity CeO 2 The content of impurities such as lanthanum oxide in the polishing powder is less than 0.02%, while the purity is 40-50% CeO 2 La in polishing powder 2 o 3 Higher content of impurities. And La 2 o 3 It is a weak alkaline oxide, which has a great corrosion effect on the glass surface. In the production of nanocry...

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Problems solved by technology

However, all the reports in the literature focus on how the cation exchange fiber is applied to the rare earth preparation process, and there is no report on the application of the strong acid cation exchange fiber to the separation and enrichment of rare earth impurities in high-purity cerium oxide.

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