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.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1998年第9期392-394,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
稀土
三溴偶氮胂
极谱配合吸附波
Rare Earth(Ⅲ)
Tribromoarsenazo
Polarographic adsorptive wave
作者简介
通讯联系人:黎拒难。
