表面活性剂对极性有机物在沉积物上吸附的影响

研究了苯酚、苯胺和对硝基苯酚在沉积物-十二烷基苯磺酸钠(SDBS)体系中的分配特性.结果表明200mg/L和1200mg/L的SDBS存在下,苯胺和对硝基苯酚的沉积物-水分配系数均增大,分配作用的增大倍数与有机物的K_ow呈正相关;苯酚的分配系数则因表面活性剂存在浓度的不同分别增大和减小.十二烷基硫酸钠(SDS)、Triton X-100(TX100)和Brij30存在下,苯酚等温吸附实验表明:表面活性剂浓度约低于其临界胶束浓度(CMC)时,苯酚的吸附量增大;表面活性剂浓度约高于其CMC时,苯酚的吸附量比纯水中的吸附量小.

Effect of Surfactant on Sorption of Polar Organic Compounds in Sediment

Partition characters of phenol,aniline and p-nitrophenol in sediment-anionic surfactant sodium dodecylbenzene sulfonate(SDBS) system were researched. The results indicated that the sediment-water partition coefficients K of aniline and p-nitrophenol increased when the initial concentrations were set at 200mg/L and 1200mg/L for SDBS. The positive relation was found between partition enhancement and the K_ow of the reference organic compounds. But the K of phenol was different from that of aniline and p-nitrophenol in SDBS system with initial concentration set for 1200mg/L and it was lower than that in pure water. The data showed that in sodium dodecyl sulfate(SDS), Triton X-100(TX100) and Brij30 systems respectively, the sorption of phenol on the sediment was enhanced by surfactants below their critical micelle concentrations(CMCs),but it was diminished above the surfactant CMCs.