矿石中低量稀土总量的测定,近年来,国内外做了较多的工作。一般是予先分离伴生元素后,用偶氮胂Ⅲ光度法测定。PMBP-苯萃取分离稀土国内应用最为普遍,此法分离效果较好。但由于使用有毒的有机溶剂,对分析人员和环境带来严重的影响,而且手续亦相当冗长。我 Determination of the total amount of rare and middle-earth ore, in recent years, do more work at home and abroad. General is the first separation of associated elements, with arsenazo spectrophotometry. PMBP-benzene extraction of rare earth separation is the most common domestic application, this method is better separation. However, the use of toxic organic solvents has serious implications for analysts and the environment, and the formalities are quite lengthy. I