铁矿中稀土总量的光度测定,以往多用偶氮胂Ⅲ或偶氮氯磷Ⅲ显色光度法.前者需要进行分离干扰离子之后方可进行测定,后者当试样中钙含量大于5%时仍需进行除钙操作.作者将武汉大学研制的稀土元素新显色剂——对乙酰基偶氮胂用于铁矿中稀土总量的测定.通过条件试验,以高氯酸调节溶液pH1.2～2.0,加入0.2%草酸为掩蔽剂, In the past, the total amount of rare earth in iron ore photometry, the past mostly with arsenazo Ⅲ or azo chlorophosphorus Ⅲ color spectrophotometry. The former requires separation of interfering ions before the determination of the latter when the sample of calcium content greater than 5% When still need to carry out calcium removal operation.The author will Wuhan University developed a new reagent rare earth element - acetylarsenazo arsenic for iron ore in the determination of the total amount of rare earths.Through the condition test, with perchloric acid to adjust the solution pH1 .2 ~ 2.0, adding 0.2% oxalic acid as masking agent,