采用散射线背景比值法校正基体效应,人工模拟催化剂合成标准样品,粉末直接压片法用X-射线荧光测定催化裂化催化剂中稀土元素镧、铈、镨、铍、钐的含量。可测定混合稀土氧化物总量在0.4～20％(wt)的催化剂及Y型分子筛的全部样品。相对标准偏差在2％以下,与化学分析结果相吻合。 The matrix effect was calibrated by the background ratio of scattered ray and the standard samples were synthesized by artificial simulated catalyst. The contents of rare earth elements such as lanthanum, cerium, praseodymium, beryllium and samarium were determined by X-ray fluorescence. The total amount of mixed rare earth oxides can be measured 0.4 ~ 20% (wt) of the catalyst and the Y-type zeolite all the samples. Relative standard deviation of 2% or less, consistent with the results of chemical analysis.