稀土(Ⅲ)-三溴偶氮胂络合物极谱吸附波的研究  

STUDY ON THE POLAROGRAPHIC ADSORPTIVE WAVES OF COMPLEXES OF RARE EARTH (Ⅲ) AND TRIBROMOARSENAZO

作　　者：彭晖[1] 黎拒难[1] 李海 

机构地区：[1]湘潭大学化学化工学院,湘潭411105

出　　处：《理化检验（化学分册）》1998年第9期392-394,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在PH9.0的氨水-氯化铵缓冲溶液中,稀土(Ⅲ)与三溴偶氮胂在-0.69V(vs.SCE)处产生一灵敏的极谱波,二次导数峰高与稀土浓度在3.O×10^(-8)～9.0×10^(-7)mol·L^(-1)范围内呈线性关系,检出限为2.O×10^(-8)mol·L^(-1).探讨了该极谱波的性质和电极反应机理.用此法测定了球墨铸铁中的稀土总量,结果满意.Sensitive adsorptive waves of complexes of rare earth ( ? ) and tribromoarsenazo are obtained by using single-sweep polarography in 0. 8mol ?L_(-1) ammoniacal buffer solution at pH 9. 0. The peak potential is ?0. 69V(vs. SCE). The peak height is proportional to the concentration of RE( ? ) over the range from 3. OX 10^(-8) to 9. 0X10^(-7)mol ?L^(-1). The limit of detection is 2. 0X10^(-8)mol ?L(-1). The properties of the polarographic waves and the electrode reaction mechanism are discussed in detail. The method has been applied to the determination of the trace RE( ? ) in several nodular cast iron with satisfactory results.

关 键 词：稀土 三溴偶氮胂 极谱配合吸附波 

分 类 号：TG143.5[一般工业技术—材料科学与工程] O614.33[金属学及工艺—金属材料]