| Resonance Rayleigh scattering spectrum for the chelate of lanthanum(Ⅲ) with sodium tanshinon ⅡA silate and its analytical application |
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| 作者姓名： | PENG Jingdong LIU Shaopu LIU Zhongfang & SHI Yan College of Chemistry and Chemical Engineering Southwest China Normal University Chongqing China |
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| 作者单位： | PENG Jingdong，LIU Shaopu，LIU Zhongfang & SHI Yan College of Chemistry and Chemical Engineering，Southwest China Normal University，Chongqing 400715，China |
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| 摘 要： | In a pH 3.6―5.0 HAc-NaAc buffer solution, when sodium tanshinon ⅡA silate (STSⅡA) reacts with La(Ⅲ) to form a chelate, the resonance Rayleigh scattering (RRS) intensity can be en-hanced greatly and a new RRS spectrum will appear. The maximum RRS peak is located at 306 nm and the RRS intensity is proportional to the concentration of STSⅡA in a certain range. The method is very sensitive and the detection limit for STSⅡA (3σ/K) is 82.12 ng·mL?1. The optimum reaction condi-tions and the effect of coexisting substances have been investigated. A new, simple and fast method for the determination of STSⅡA based on RRS method is developed. It can be applied to the deter-mination of STSⅡA in the synthesis samples and Nuoxinkang injection. Combined with infrared ab-sorption and NMR spectra, the structure of the chelate and the reasons of RRS enhancement are also discussed.
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| 关 键 词： | lanthanum(Ⅲ) sodium tanshinon ⅡA silate chelate resonance Rayleigh scattering analytical application. |
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