众所周知,对于组分复杂的合金中微量稀土(铈)的测定必须经过分离富集的程序,如铜试剂沉淀分离或PMBP-萃取分离等。但这些方法不仅手续烦多,且易污染环境。近几年来设法改进的研究较多,如资料[3]使用半二甲酚橙-溴代十六烷基吡啶光度法直接测定低钛、低铝钢样中的稀土;资料[4]用直接光度法测定合金钢中的稀土,但未见应用于高温合金。资料[5]应用0.3％的偶氮脾Ⅲ测定了高温合金 It is well known that the determination of trace rare earths (cerium) in complex alloys requires separation and enrichment procedures such as copper reagent precipitation or PMBP-extraction. However, these methods are not only troublesome procedures, and easy to pollute the environment. In recent years try to improve the research more, such as data [3] using the half-xylenol orange - bromodecyl pyridyl spectrophotometry direct determination of low-titanium, low-aluminum steel sample rare earth; Spectrophotometric determination of rare earth alloy steel, but not used in high temperature alloys. Data [5] the application of 0.3% azo spleen Ⅲ determination of the superalloy