Abstract：In this paper,the colour reaction of the cerium subgroup of rare earth elements with tribromoarsenazo(TBA)has been studied.Cerium subgroup reacts with the reagent in strong acid medium of HCl to form a blue violet complex which has a maximum absorption at 635nm and its molar ratio of Ce subgroup to TBA is 1:3.The apparent molar absorptivity is(1.15～1.25)×10-5L·mol-1·cm-1 Beer's law is obeyed in (0～25)μg/50mL.The method has been applied to the direct photometric determination of the Ce subgroup in aluminium alloys with satisfactory results.
吴雅琴, 潘傥, 李莉. 三溴偶氮胂直接光度法测定铝合金中铈组稀土元素[J]. 材料工程, 1997, 0(11): 31-33,30.
Wu Yaqin, Pan Tang, Li Li. Direct Spectrophotometric Determination of Cerium Subgroup of Rare Earth Elements in Aluminium Alloys with Tribromoarsenazo. Journal of Materials Engineering, 1997, 0(11): 31-33,30.