稀土复合氧化物催化剂中镧、钙、锰的含量分析,目前,已有人做过工作。方法之一,控制pH分离镧、锰后,用EDTA络合滴定钙的含量,再在磷酸介质中用硫酸亚铁法分析锰量,差减法计算镧的含量;方法之二,利用离子交换法分离镧、钙、锰,再采用络合滴定分别测镧、钙、锰含量。两种方法共同存在的问题是手续冗长,费时。其中方法 Rare earth composite oxide catalyst lanthanum, calcium, manganese content analysis, at present, people have done work. One of the methods, the control of the separation of lanthanum, manganese, EDTA, with EDTA complexation titration of calcium content, and then in the phosphoric acid medium ferrous sulfate method for the analysis of manganese content, subtraction method for the calculation of lanthanum content; Method two, the use of ion exchange Separation of lanthanum, calcium, manganese, and then measured by complexometric titration of lanthanum, calcium, manganese content. The common problem with both methods is lengthy and time-consuming procedures. Which method