镨与环丙沙星配合物4f电子跃迁吸收光谱的研究及其分析应用。

Study of the absorption spectra of the 4f electron transitions of the praseodymium complex with ciprofloxacin and its analytical application.

作者信息

Wei J, Naixing W, Quanjie M, Zhikun S, Xiuqin X, Fuxiang L

机构信息

Department of Chemistry, Shandong University, Jinan, China.

出版信息

Analyst. 2001 Aug;126(8):1440-3. doi: 10.1039/b101863i.

DOI:10.1039/b101863i

PMID:11534622

Abstract

Ciprofloxacin (CPFX) is proposed as a reagent for the derivative spectrophotometric determination of praseodymium in mixed rare earths. The absorption spectra of 4f electron transitions of the praseodymium complex with CPFX was studied by normal and derivative spectrophotometry. The stoichiometry of the praseodymium-CPFX complex was calculated by the molar ratio and continuous variations methods. A ratio of Pr to CPFX of 1:3 was found. The absorption bands of the 4f electron transitions of the complex were enhanced markedly. Using the third derivative spectrum. Beer's law was obeyed up to 35 microg cm(-3) of praseodymium. The relative standard deviation is 0.62% for 14 microg cm(-3) of praseodymium. The detection and quantification limits were 0.17 and 0.56 microg cm(-3) of praseodymium, respectively. A method for the direct determination of praseodymium in mixtures of rare earths with good accuracy and selectivity is described.

摘要

环丙沙星（CPFX）被提议作为一种用于导数分光光度法测定混合稀土中镨的试剂。采用常规分光光度法和导数分光光度法研究了镨与CPFX配合物的4f电子跃迁吸收光谱。通过摩尔比法和连续变化法计算了镨 - CPFX配合物的化学计量比。发现镨与CPFX的比例为1:3。该配合物的4f电子跃迁吸收带显著增强。利用三阶导数光谱，镨含量在35μg cm⁻³以内时符合比尔定律。对于14μg cm⁻³的镨，相对标准偏差为0.62%。镨的检测限和定量限分别为0.17μg cm⁻³和0.56μg cm⁻³。描述了一种直接测定稀土混合物中镨的方法，该方法具有良好的准确度和选择性。