试样中混合稀土总量常以稀土氧化物总量(∑RE_xO_y％)和稀土元素总量(∑RE％)两种形式表示。由测定全部单一稀土元素含量,再求其总量需要设备复杂的X荧光仪或大型发射光谱仪等手段,因此许多中小型工厂或研究单位多采用设备简单的重量法或光度法,而以混合稀土氧化物总量来表示结果。但在稀土电解、稀土合金研制等领域往往 The total amount of mixed rare earths in the sample is often expressed in terms of the total rare earth oxides (ΣRE_xO_y%) and the total rare earth elements (ΣRE%). From the determination of all single REE content, and then seek the total amount of equipment required complex X-ray fluorescence spectrometer or large-scale emission spectrometer and other means, so many small factories or research institutions to use more equipment simple gravimetric method or photometric method, and mixed rare earth The total amount of oxide to indicate the result. However, rare earth electrolysis, rare earth alloy development and other fields are often