RARE EARTH OXIDE STANDARD SAMPLE AND PREPARATION METHOD THEREOF

The invention relates to the technical field of standard sample preparation, in particular to a rare earth oxide standard sample and a preparation method thereof. The rare earth oxide standard sample comprises a uniform mixture of rare earth oxide and sodium chloride, the rare earth oxides in the rare earth oxide standard sample are 28-42% in percentage by mass, and the rare earth oxides comprise lanthanum oxide, cerium oxide, praseodymium oxide and neodymium oxide; the content of the lanthanum oxide is 0.1%-15%, the content of the cerium oxide is 0.2%-28%, the content of the praseodymium oxide is 0.1%-8%, and the content of the neodymium oxide is 0.5%-32%. Sodium chloride is used as a diluent, so that the total concentration of rare earth can be effectively reduced, the content range of a standard value is accurately controlled, the standard value of a standard sample is consistent with the total content of rare earth of an actual product (rare earth carbonate and rare earth chloride), and the product quality is further accurately controlled; and the standard sample has relatively high uniformity and stability.