钯（II）-头孢曲松螯合物与阴离子表面活性剂相互作用的共振瑞利散射、二级散射及倍频散射光谱研究及其分析应用
Study on the resonance Rayleigh scattering, second-order scattering and frequency doubling scattering spectra of the interactions of palladium(II)-ceftriaxone chelate with anionic surfactants and their analytical applications.
作者信息
Fu Shenghui, Liu Zhongfang, Liu Shaopu, Yi Aoer
机构信息
School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
出版信息
Talanta. 2008 Apr 15;75(2):528-35. doi: 10.1016/j.talanta.2007.11.046. Epub 2007 Nov 24.
In pH 1.8-2.9 Britton-Robinson (BR) buffer medium, ceftriaxone (CTRX) can react with palladium(II) (Pd(II)) to form 1:2 cationic chelate, which can further react with anionic surfactants (AS) such as sodium lauryl sulfonate (SLS), sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (SDBS) to form 1:3 ion-association complexes. As a result, the resonance Rayleigh scattering (RRS), second-order scattering (SOS) and frequency doubling scattering (FDS) were enhanced greatly. The maximum RRS, SOS and FDS wavelengths of three ion-association complexes were located at 335 nm, 560 nm and 390 nm, respectively. The increments of scattering intensity (DeltaI) were directly proportional to the concentrations of CTRX in certain ranges. The detection limits (3sigma) of CTRX for SLS, SDBS and SDS systems were 1.8 ng ml(-1), 2.3 ng ml(-1) and 2.3 ng ml(-1) (RRS method), 4.9 ng ml(-1), 7.4 ng ml(-1) and 4.7 ng ml(-1) (SOS method) and 6.8 ng ml(-1), 7.3 ng ml(-1) and 9.1 ng ml(-1) (FDS method), separately. The sensitivity of RRS method was higher than those of SOS and FDS methods. The optimum conditions of RRS method and the influence factors were investigated, and the composition of ion-association complexes and the reaction mechanism were discussed also. The effects of foreign substances were tested and it showed that the method has a good selectivity. Based on the ion-association reaction, the sensitive, simple and rapid methods for the determination of CTRX have been developed.
在pH 1.8 - 2.9的 Britton - Robinson（BR）缓冲介质中，头孢曲松（CTRX）能与钯（II）（Pd（II））反应形成1:2的阳离子螯合物，该螯合物能进一步与阴离子表面活性剂（AS）如十二烷基磺酸钠（SLS）、十二烷基硫酸钠（SDS）和十二烷基苯磺酸钠（SDBS）反应形成1:3的离子缔合物。结果，共振瑞利散射（RRS）、二级散射（SOS）和倍频散射（FDS）显著增强。三种离子缔合物的最大RRS、SOS和FDS波长分别位于335 nm、560 nm和390 nm处。在一定范围内，散射强度的增量（ΔI）与CTRX的浓度成正比。CTRX在SLS、SDBS和SDS体系中的检测限（3σ）分别为1.8 ng ml⁻¹、2.3 ng ml⁻¹和2.3 ng ml⁻¹（RRS法），4.9 ng ml⁻¹、7.4 ng ml⁻¹和4.7 ng ml⁻¹（SOS法）以及6.8 ng ml⁻¹、7.3 ng ml⁻¹和9.1 ng ml⁻¹（FDS法）。RRS法的灵敏度高于SOS法和FDS法。研究了RRS法的最佳条件及影响因素，并探讨了离子缔合物的组成和反应机理。测试了外来物质的影响，结果表明该方法具有良好的选择性。基于离子缔合反应，建立了灵敏、简便、快速的CTRX测定方法。
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