分光光度法研究稀土与DBS-偶氮氯膦的络合形成反应  

Spectrophotometric Study on the Complexes Formation between Rare Earth and DBS-Chlorophosphonazo

作　　者：何久康 彭姝丽[1] 

机构地区：[1]内蒙古大学化学系

出　　处：《内蒙古大学学报（自然科学版）》1990年第2期235-240,共6页Journal of Inner Mongolia University：Natural Science Edition

摘　　要：本文研究了DBS-偶氮氯膦试剂的特性;稀土元素与其形成络合物的组成;测定了络合物的稳定常数以及用DBS-偶氮氯膦与稀土元素反应的各种实验条件。DBS-CPA is a new photometric reagent. Protonation of this reagent takes place in acidic medium (logK_=-2.00) while dissociation of the first hydroxyl group from naphthalene ring is shifted toward the basic region (PK_=9.89). The complexs of RE(La. Y) are formed in pH range of 1.0～2.0. The mole ratio have been estimated to be 1:3 by continuous variation method and equilibrium shift method. The overall stability constants of rare earth elements with DBS-CPA have been determination. DBS-CPA is sensitive and selective for determination of RE_xO_y.

关 键 词：稀土 络合物 分光光度法 偶氮氯膦 

分 类 号：O614.33[理学—无机化学]