钙对钐、铕-四环素类体系荧光法测定钐和铕的增敏作用及其机理探讨  

Calcium-Enhancement Mechanism of the Fluorescence of Europium-Tetracycline Homolog Systems and Its Application to the Determination of Samarium (Ⅲ)and Europium (Ⅲ)

作　　者：李红霞[1] 张俊杰[2] 黄汉国[2] 

机构地区：[1]唐山钢铁公司技术中心 [2]河北理工学院,唐山063009

出　　处：《分析化学》1996年第7期844-847,共4页Chinese Journal of Analytical Chemistry

基　　金：河北省自然科学基金

摘　　要：本文研究了常见金属离子（Cr3+、Mn2+、Fe3+、Ni2+、Cu2+、Ca2+、Sr2+、Ba2+、Sn2+、Al3+、Zn2+、Li+、Ms2+）对钐、铕-四环素（TC）、土霉素（OTC）、强力霉素（DOTC）、金霉素（CTC）体系荧光的影响，并从电子自旋磁性和多核络合物的形成等方面对其作用机理进行了探讨。进一步探讨了Ca2增敏TC类体系恻定Sm3+、Eu3+的最佳测定条件。由于钙的加入，可使钐、铕的荧光强度分别增敏3～5和6～30倍。以TC体系为最佳，加入钙，可分别使钐、铕的检测限由38.2和0.09μg／L降低到7.9和0.015μg／L。成功地对样品进行了分析测定。In this paper the influence of common ions such as calcium on the fluorescence of europium-tetracycline homolog systems was studied and the fluorescence enhancement mech anism based on both the electron spin magnetism and the multinucleate complexes formation was investigated. Hence, the samarium and europium were determined by calcium-enhancing flourescence method. As calcium is added, the fluorescece intensity increases 6～30 times for europium and 3～5 times for samarium. Tetracycline was shown to be the optimum reagent.The detection limit in tetracycline systems for samarium and europium is reduced from 38. 2 and 0.09 μg/L to 7. 9 and 0. 015μg/L, respectively.

关 键 词：钐 铕 四环素 土霉素 荧光光度法 增敏作用 

分 类 号：O614.33[理学—无机化学] O657.39[理学—化学]