Institute of Food and Radiation Biology, Bangladesh Atomic Energy Commission, Ganakbari, Savar, P.O. BOX 3787, Dhaka, Bangladesh.
Environ Sci Pollut Res Int. 1994 Sep;1(3):131-9. doi: 10.1007/BF02986935.
Reductions in the apparent soil-water partition coefficients (Kd ()) for 28 polychlorinated biphenyls (PCBs) caused by the surfactant sodium dodecylsulphate (SDS) in the aqueous phase were studied. Above the critical micelle concentration (CMC) of the surfactant, Kd () was reduced by 2-3 orders of magnitude, but even far below CMC at environmentally relevant surfactant concentrations significant reductions in Kd () were observed. The plot of the soil-water partition coefficient (Kd) divided by Kd () versus the concentration of SDS allowed for the calculation of monomer (Kmn (oc)) and micellar (Kmc (oc)) surfactant-water partition coefficients normalized to organic carbon for each PCB congener. Kmn (oc) values were comparable with published values for the partition of PCBs between natural dissolved organic matter and lake water. Kmc (oc) values were up to 30 times higher than Kmn (oc) values and comparable with published octanol-water distribution coefficients. The findings of the present study underline the potential of surfactants at concentrations below their CMC to mobilize otherwise strongly bound hydrophobic compounds in soil-water systems.
研究了水相中表面活性剂十二烷基硫酸钠（SDS）导致的 28 种多氯联苯（PCBs）表观土壤-水分配系数（Kd()）的降低。在表面活性剂的临界胶束浓度（CMC）以上，Kd()降低了 2-3 个数量级，但即使在环境相关的表面活性剂浓度远低于 CMC 时，Kd()也显著降低。土壤-水分配系数（Kd）除以 Kd()与 SDS 浓度的关系图允许计算单体（Kmn(oc)）和胶束（Kmc(oc)）表面活性剂-水分配系数，这些系数与每种 PCB 同系物的有机碳归一化。Kmn(oc)值与文献中报道的 PCB 在天然溶解有机质和湖水之间的分配值相当。Kmc(oc)值比 Kmn(oc)值高 30 倍左右，与文献中报道的辛醇-水分配系数相当。本研究的结果强调了在 CMC 以下浓度的表面活性剂有潜力在土壤-水系统中使原本强烈结合的疏水性化合物发生迁移。
