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 kJ·mol-1增加至-37.580 kJ·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

The interaction between sodium dodecyl benzene sulfonate (SDBS) and sodium dodecyl sulfonate (SDS) could have a significant impact on the quantitative analysis of SDBS in water. The results indicate that the existence of SDS not only can improve the synchronous fluorescence intensity of SDBS but also can greatly decrease the apparent critical micelle concentration values of SDBS. The interference of SDS on the synchronous fluorescence intensity of SDBS can be greatly reduced by adding 1∶1 HP-β-CD according to the molar amount of SDBS. The results also show that SDBS molecules are more likely to form SDBS/HP-β-CD inclusion with the molar ratio of 1∶1 rather than micelles in HP-β-CD aqueous solution. Thus, the standard molar Gibbs free energy for SDBS from aqueous SDS/SDBS binary blend solution to the micelle, ΔγGθm, increases from -39.681 kJ·mol-1 to -37.580 kJ·mol-1 while the concentration of HP-β-CD increases from 0 to 0.900 mmol·L-1. The concentration of SDBS in aqueous SDS/SDBS binary blend solution (water samples taken from T5 sites of LinPan oilfield), can be accurately determinated by adding proper amount of HP-CD, and the recovery rate of SDBS is 101.0%-101.6%. The results of 1H-NMR and FT-IR exhibit that the interference of SDS on quantitative determination of SDBS can be greatly reduced because of the formation of SDBS/HP-β-CD inclusion (molar ratio of 1∶1) with SDBS molecule locating within the broad mouth of HP-CD molecule.