洛美沙星导数分光光度法测定稀土混合物中的镨

Derivative spectrophotometric determination of praseodymium in rare earth mixtures with lomefloxacin.

作者信息

Wang N, Ren X, Si Z, Jiang W, Liu C, Liu X

机构信息

Department of Chemistry, Shandong University, Jinan 250100, PR China.

出版信息

Talanta. 2000 Mar 6;51(3):595-8. doi: 10.1016/s0039-9140(99)00317-3.

DOI:10.1016/s0039-9140(99)00317-3

PMID:18967892

Abstract

Praseodymium forms a Pr(LMFX)(3) complex with lomefloxacin. In this paper, the absorption spectra of the complex has been investigated by applying conventional and derivative spectrophotometric methods. It was found that lomefloxacin could form a stable complex with praseodymium in the pH 6.5-8.5 media. The absorption intensity of the complex is 4.5-fold more than PrCl(3). Using the second derivative spectra, the sensitivity is 7.4 times higher for Pr than in the normal method (zero derivative spectra). The second derivative spectrophotometry for determination of praseodymium in the presence of other rare earths has been developed. The calibration curves were linear in the range of 3.5-65 mug ml(-1) for Pr. The detection limit is 0.85 mug ml(-1). The method is satisfactory for the determination of praseodymium in mixed rare earths.

摘要

镨与洛美沙星形成Pr(LMFX)₃络合物。本文采用常规分光光度法和导数分光光度法研究了该络合物的吸收光谱。结果发现，在pH 6.5 - 8.5介质中，洛美沙星能与镨形成稳定的络合物。该络合物的吸收强度比PrCl₃高4.5倍。利用二阶导数光谱法，镨的灵敏度比常规方法（零阶导数光谱法）高7.4倍。已建立了在其他稀土元素存在下测定镨的二阶导数分光光度法。镨的校准曲线在3.5 - 65 μg ml⁻¹范围内呈线性。检测限为0.85 μg ml⁻¹。该方法用于混合稀土中镨的测定结果令人满意。