[Study on the enhanced spectrum quantitative analysis of SDBS induced by beta-cyclodextrin].

A novel enhanced ultraviolet absorption spectrometry method was developed for the quantitative analysis of SDBS induced byβ-cyclodextrin(β-CD)with strong interferences.The ultraviolet absorption spectra of SDBS indicated that the presence ofβ-CD could result in the enhancement of absorption intensities of SDBS.A good linearity was obtained between the UV-absorption intensity of the system and the concentration of SDBS.The results indicated that the determination precision and the determination ranges of SDBS could be greatly improved byβ-CD.The effect of several common interfering substances(SDS,OP10,HPAM)on the determination of SDBS could be significantly reduced inβ-CD aqueous solution.Therefore,the maximum errors of the determined SDBS were less than 2.0% under multifactor interferences,and the precision of the method was also as high as 10-2～10-3 mg.L-1.The stable inclusion ofβ-CD and SDBS could be automatically formed in water with molar ratio of 1:1.The stability constant of the inclusion,Ka,was 87and the standard Gibbs function of molar reaction,ΔγGmΘ(298K),was-11.064kJ.mol-1.FTIR analysis exhibited that SDBS could be induced byβ-CD since the phenyl group in SDBS molecule could exist stably in the cavity ofβ-CD and form the inclusion.