表面活性剂溶液中多氯联苯溶解的特性

 对表面活性剂溶液中多氯联苯的溶解特性进行了研究.发现非离子型表面活性剂对多氯联苯增溶效果优于阴离子型表面活性剂;在浓度大于临界胶束浓度(CMC)范畴,不但表面活性剂的增溶效果远较其浓度低于CMC时为佳,而且表面活性剂浓度与多氯联苯的溶解度成正比地线性相关,此结果说明,表面活性剂主要通过形成胶束来增加多氯联苯的溶解度.多氯联苯在非离子型表面活性剂胶束溶液中与在正己烷中的紫外-可见光谱相似,进一步说明胶束内的多氯联苯分子主要分布于类似正己烷的疏水胶核区域.在十二烷基醇聚氧乙烯(10)醚溶液中,所试多氯联苯的辛醇-水分配系数(K_ow)与其胶束-水分配系数(K_m)存在很好的线性相关关系.

Characterization of polychlorinated biphenyls dissolved in surfactant solutions.

Dissolution of PCB in surfactant solutions was characterized. It was found that solubility enhancement of thePCB in non-ionic surfactant was greater than that in anionic surfactant. In the range of surfactant concentrations above critical micellar concentration (CMC), not only the enhancement of PCB solubility was much greater than that in therange below the CMC, but also the solubility was linearly proportional to the surfactant concentrations, indicatingsurfactant micelles played an important role in the solubility enhancement. UV-VIS spectra of the PCBs in non-ionic surfactant micellar solutions were similar to the spectra in hexane, further suggesting that the PCB molecules inside the micelles mainly resided in the hexane-like hydrophobic micellar core or its vicinity. In polyoxyethylene (10) lauryl ethersolution, the micelle-aqueous phase partitioning coefficient (Km) had very good linear proportion to the octanol-water partitioning coefficient (Kow) for the tested PCBs.