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：Cerium hydroxide is non-toxic and has been widely used as a cerium-based functional material in the fields of automobile exhaust purification catalyst and high-end electronic grinding new materials. The rapid and accurate determination of potassium oxide content in cerium hydroxide is of great significance to the quality control of products. The mass fraction of potassium oxide in cerium hydroxide products is required to be lower than 0.000 3%, but the matrix effect of cerium oxide has interference with the determination of potassium oxide. The sample was dissolved with hydrochloric acid followed by separation of cerium matrix with oxalic acid. The filtrate was analyzed in 3% (V/V) hydrochloric acid medium. The calibration curve was prepared by standard addition method. The determination method of potassium oxide content in cerium hydroxide by air-acetylene flame atomic absorption spectrometry (FAAS) was established. The effect of cerium matrix on the determination of potassium was investigated. The results showed that the cerium matrix had interference with the determination. In experiments, a large amount of cerium was separated with oxalic acid, and the influence of oxalic acid matrix effect on the determination of potassium was eliminated by standard addition method. The limit of detection was 0.50 μg/g. The limit of quantification was 2.0 μg/g. The interference tests indicated that the interference of coexisting elements in sample including aluminum, calcium, sodium, iron, manganese, zinc, magnesium and lead could be ignored when the content of potassium oxide in cerium hydroxide was determined using correction mode of standard addition method. The proposed method was applied for determination of potassium oxide in actual cerium hydroxide samples. The relative standard deviation (RSD, n=11) of determination results was less than 20%, and the recoveries were between 95% and 103%.
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