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研究了以三溴偶氮胂作显色剂，用三波长光度法直接测定铝矿石中稀土氧化物总量的新方法。测定范围０～３０ｍｇ／５０ＬＲＥ２Ｏ３，回收率为９８％～１０２％。本方法用于测定铝矿石中稀土总量，获得满意结果。
A new method for the direct determination of the total rare earth oxides in aluminum ores using tribromoarsenazo as chromogenic reagent and three-wavelength spectrophotometry was studied. The determination range 0 ~ 30mg / 50LRE2O3, the recovery rate of 98% ~ 102%. This method is used to determine the total amount of rare earths in aluminum ore and obtain satisfactory results.