多体系多波长计算光度法同时测定镧铈镨钕钐铕钆  

Simultaneous Determination of La^(3+),Ce^(3+),Pr^(3+),Nd^(3+),Sm^(3+),Eu^(3+),Gd^(3+) in Their Mixtures by Multi-system Multi-wavelength Computational Spectropho tometry

作　　者：刘德龙[1] 

机构地区：[1]河北师范大学化学系,石家庄050091

出　　处：《光谱学与光谱分析》2000年第5期744-746,共3页Spectroscopy and Spectral Analysis

基　　金：河北省教委自然科学基金!(982 0 7);河北省博士科研基金项目

摘　　要：本文以DBC 偶氮氯膦为显色剂 ,并且在显色体系中加入不同量的EDTA Na2 P2 O7作为竞争配位剂 ,使得七组分轻稀土组分间吸收光谱灵敏度的差别逐渐加大 ,从而增加了轻稀土混合物体系组分间吸收光谱的线性独立性。利用数值稳定性较强的约束优化算法———可变容差法处理光谱数据 ,对不同浓度比例的七组分轻稀土混合物体系 (La3 + ,Ce3 + ,Pr3 + ,Nd3 + ,Sm3 + ,Eu3 + ,Gd3 + )的测定 。Since the spectra of the rare earth color comple xes are rather similar,it is very difficult to determine simultaneously rare ear th elements in their mixtures.To reduce the collinearity of multicomponent spect ra,different amounts of EDTA-Na 2P 2O 7 were added to the rare earth-DBC-C PA(2-(4-chloro-2-phosphonophenylazo)-(2,6-dibromo-4-chlorophenylazo)1,8 -dihydroxy-3,6-naphthalene-difulfonic acid) color system.The flexible tolera nce method which has high numerical stability and resolving power was used to im prove the reliability of simultaneous spectrophotometry.The method has been appl ied to simultaneous spectrophotometric determination of seven components of rare earth elements(La- 3+,Ce- 3+,Pr- 3+,Nd- 3+, Sm- 3+,Eu- 3+,Gd- 3+) in synthetic samples with satisf actory results.

关 键 词：稀土 分析 计算光度法 镧 铈 镨 钕 钐 铕 钆 

分 类 号：O614.33[理学—无机化学] O657.3[理学—化学]