This document warns users that they must have practical experience in formal laboratory work and be aware of possible safety issues. The methods and scope of application for the determination of mace, cerium, wrong, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in europium are described, including the determination of metal pins and oxidation europium. A total of three methods are included: Inductance-coupled plasma emission light spectrum method (ICP-OES), Inductance-coupled plasma constituency harmonic method (ICP-MS) and Inductance-coupled plasma tandem mass spectrometry (ICP-MS-MS). Method 2 is recommended as the arbitration method when the Analysis ranges overlap.