DBC-偶氮氯膦固相光度法测定痕量镧(英文)  

Solid Phase Spectrophotometric Determination of Trace Amount of Lanthanum with DBC-Chlorophosphonazo

作　　者：邵晶[1] 翟庆洲[1] 胡伟华[1] 李景梅[1] 张伟[1] 

机构地区：[1]长春理工大学纳米技术研究中心,吉林长春130022

出　　处：《稀有金属材料与工程》2006年第2期329-332,共4页Rare Metal Materials and Engineering

基　　金：Supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Changchun University of Science and Technology, China (40103/129159)

摘　　要：在0．5mol·L^-1盐酸介质中，La（Ⅲ）-（DBC-偶氮氯膦）所形成的络合物可吸附到201×7型苯乙烯阴离子树脂上。该固相显色体系最大吸收波长位于650nm，镧的表观摩尔吸光系数为ε650=2．08×10^5L·mol^-1．cm^-1。该固相分光光度法测定镧灵敏度为La（Ⅲ）-（DBC-偶氮氯膦）液相分光光度法灵敏度的2．31倍。镧在0～0．44μg·ml^-1范围内遵守比尔定律。考察了26种共存离子对测定镧的影响。本研究所建立的方法已成功地用于分子筛中镧的测定，结果满意。In the medium of 0.5 mol·L^-1 hydrochloric acid, the complex formed by lanthanum（Ⅲ）-（DBC-chlorophosphonazo） can be adsorbed on 201×7 type benzenevinyl anion resin. The maximum absorption wavelength of the solid phase color system locates at 650 nm with an apparent molar absorptivity of ε650nm=2.08×10^5 L·mol^-1·cm^-1 for lanthanum. The sensitivity of the solid phase spectrophotometry for the determination of lanthanum is 2.31 times of the sensitivity of the lanthanum（Ⅲ）-（DBC-chlorophosphonazo） liquid phase spectrophotometry. Beer＇s law is obeyed over the range of 0-0.44μg·ml^-1 of lanthanum. The effects of twenty-six coexisting ions on the determination of lanthanum were examined. The developed method has been successfully applied to the determination of lanthanum in molecular sieves with satisfactory results.

关 键 词：固相光度法 镧 DBC-偶氮氯膦 

分 类 号：O657.3[理学—分析化学] O614.331[理学—化学]