Optimization Study of Lanthanum Determination in High-Purity Cerium Oxide by ICP-MSYUAN AITranslate

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Chinese Library Classification Number:O657.63[理学—分析化学];TQ133.3[理学—化学]

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High-purity cerium oxide is widely used in high-end sectors such as electronics and optics.There-fore,the accurate determination of its lanthanum content is essential for ensuring product quality control and improving the efficiency of comprehensive resource utilization.To address the issue of insufficient pre-cision in the determination of lanthanum content in high-purity cerium oxide by inductively coupled plasma mass spectrometry(ICP-MS),this paper systematically analyzes the primary influencing factors,including the complexity of the sample composition,environmental interferences(temperature and relative humidi-ty),and the settings of instrumental parameters(RF power and carrier gas flow rate).Based on this analy-sis,corresponding optimization strategies are proposed:Sample pretreatment using ion exchange chroma-tography or extraction to reduce impurity interference and enrich lanthanum,the application of an environ-mental variable correction model to mitigate the effects of temperature and relative humidity fluctuations on the determination results,controlling the experimental environmental conditions within a temperature range of 20~25℃and relative humidity of 40%~60%,and optimizing the ICP-MS instrument operating parameters with an RF power of 1350~1400 W and a carrier gas flow rate of 0.8~1.0 L/min.Under the optimal conditions(ambient temperature of 20℃,relative humidity of 40%,RF power of 1400 W,and carrier gas flow rate of 1.0 L/min),the detection limit for lanthanum in the high-purity cerium oxide ma-trix solution reaches as low as 0.01μg/L,and the relative standard deviation(RSD)is reduced to 1.65%.This significantly enhances the accuracy and reliability of the measurement results,meeting the require-ments for the precise determination of trace lanthanum in high-purity cerium oxide.