Neodymium iron boron, as a high-performance permanent magnet material, is widely used in fields such as new energy vehicles, wind power equipment, electronic information, aerospace, etc. It is a key basic material supporting energy conservation, environmental protection, high-end manufacturing, and emerging industry development. Its performance directly affects the energy efficiency and core competitiveness of end products. The magnetic main phase of neodymium iron boron is Nd2Fe14B, and rare earth impurities (such as Pr, Sm, Dy, Gd, etc.) can destroy the main phase structure in the form of "atomic substitution", leading to an irreversible decrease in magnetic properties; The fluctuation of impurity element content can also interfere with key processes such as melting and sintering of neodymium iron boron, leading to a sharp drop in product yield. Therefore, accurate quantification of rare earth impurity elements in neodymium iron boron is crucial.

The first method in the "Methods for Chemical Analysis of Neodymium Iron Boron Alloys" (XB/T 617) [1] is Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). During the testing process, due to the large number of characteristic spectral lines emitted by rare earth elements and their close wavelengths, these elements are prone to mutual interference, which affects accurate quantification.

This article introduces a method of using FACT mode to eliminate spectral line interference between rare earth elements. This method improves the accuracy and detection limit of rare earth elements in ICP-OES analysis of neodymium iron boron, providing reliable technical support for efficient quality control of neodymium iron boron materials.