Bouchard Dermont C
US Environmental Protection Agency, Ecosystems Research Division, 960 College Station Road, Athens, Georgia 30605-2700, USA.
Environ Toxicol Chem. 2003 Apr;22(4):736-40.
This study evaluated the effects of the water-miscible cosolvent methanol on the sorption-desorption of phenanthrene by the natural organic matter (NOM) of a freshwater sediment. A biphasic pattern was observed in the relationship between the log of the carbon-normalized sorption distribution coefficient (Koc) and the volumetric fraction of water-miscible cosolvent (fc), in this case methanol, that was accounted for with phenanthrene solubility data. Results also indicated that methanol elicited additional effects on phenanthrene sorption beyond the solution phase effects. The level off, was observed to have a significant effect on sorption-desorption hysteresis, with hysteresis being greater for treatments where phenanthrene and sediment were equilibrated with methanol-phenanthrene solutions but desorbed with aqueous solutions. These results are discussed in light of the deformable pore network of the rubbery/glassy NOM polymer construct.
本研究评估了与水混溶的助溶剂甲醇对淡水沉积物中天然有机物（NOM）吸附-解吸菲的影响。在碳归一化吸附分配系数（Koc）的对数与与水混溶的助溶剂（在本案例中为甲醇）的体积分数（fc）之间的关系中观察到一种双相模式，该模式用菲的溶解度数据来解释。结果还表明，甲醇对菲吸附的影响超出了溶液相的影响。观察到起始浓度对吸附-解吸滞后现象有显著影响，对于菲和沉积物在甲醇-菲溶液中达到平衡但在水溶液中解吸的处理，滞后现象更大。根据橡胶状/玻璃态NOM聚合物结构的可变形孔隙网络对这些结果进行了讨论。
