HP-β-CD消除SDS对SDBS同步荧光光谱的影响

发布时间：2019-01-22 14:30

【摘要】：十二烷基苯磺酸钠(SDBS)与十二烷基苯磺酸钠(SDS)之间的相互作用,能对SDBS的检测产生明显干扰。实验结果表明,在水溶液中SDS不仅可以增大SDBS的同步荧光强度,还能显著降低SDBS的表观临界胶束浓度。按SDBS的摩尔计量比加入1∶1的羟丙基-β-环糊精(HP-β-CD),可以消除SDS对SDBS的同步荧光强度的干扰。相比于形成胶束,在SDS/SDBS水溶液中,SDBS单体优先选择与HP-β-CD形成量比1∶1的包结物。当水溶液中HP-β-CD的浓度由0增加至0.900 mmol·L~(-1)时,复配体系中SDBS形成胶束的标准摩尔吉布斯函变ΔγGθm由-39.681 k J·mol-1增加至-37.580 k J·mol~(-1)。加入适量HP-β-CD后,能够准确检测SDS/SDBS水溶液中SDBS的含量(临盘采油厂T5站地层水样),方法的回收率为101.0%~101.6%。FT-IR及1H-NMR分析表明,SDBS分子进入HP-β-CD分子内腔的大口径端并形成量比1∶1的包结物,是消除SDS对SDBS检测干扰的根本原因。
[Abstract]:The interaction between sodium dodecylbenzene sulfonate (SDBS) and sodium dodecylbenzene sulfonate (SDS) can interfere with the detection of SDBS. The experimental results show that SDS can not only increase the synchronous fluorescence intensity of SDBS, but also decrease the apparent critical micelle concentration of SDBS in aqueous solution. The addition of 1:1 hydroxypropyl 尾 -cyclodextrin (HP- 尾-CD),) to the molar ratio of SDBS can eliminate the interference of SDS on the synchronous fluorescence intensity of SDBS. Compared with micelle formation, in SDS/SDBS aqueous solution, the SDBS monomer preferentially chooses the inclusion compound with a ratio of 1:1 to HP- 尾-CD formation. When the concentration of HP- 尾-CD in aqueous solution increased from 0 to 0.900 mmol L ~ (-1), In the complex system, the standard molar Gibbs function of micelles formed by SDBS increases from-39.681 kJ mol-1 to -37.580 KJ mol~ (-1). After adding proper amount of HP- 尾-CD, the content of SDBS in SDS/SDBS aqueous solution can be detected accurately (formation water sample from T5 station of Linpan Oil recovery Plant). The recovery rate of the method is 101.0%~101.6%.FT-IR and 1H-NMR analysis. The SDBS molecule enters the large aperture end of the HP- 尾-CD molecular cavity and forms the inclusion compound with a volume ratio of 1:1, which is the fundamental reason for eliminating the interference of SDS to the detection of SDBS.
【作者单位】：长江大学油气资源与勘探技术教育部重点实验室;
【基金】：国家自然科学基金(41202111) 湖北省自然科学基金(2015CFB189) 长江大学长江人才计划资助项目~~
【分类号】：TE357.46

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