Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
Chemosphere. 2009 Nov;77(10):1406-11. doi: 10.1016/j.chemosphere.2009.09.008. Epub 2009 Sep 29.
Sorption of perfluorooctane sulfonate (PFOS) to oil and oil-derived black carbon (BC) from solutions varying in pH and [Ca(2+)] was investigated. Oil is a strong sorbent for PFOS, together with the independence of oil-water distribution coefficient (K(oil)) on solution parameters (pH values and [Ca(2+)]), suggesting that hydrophobic interactions of the hydrophobic moieties of PFOS with oil played a dominant role. BC sorption for PFOS is not stronger or more nonlinear than other natural organic carbon from solution in the case of 0.5mM [Ca(2+)] and pH 5.05, indicating that specific adsorption sites on BC were probably not fit for PFOS. However, both sorption capacity and nonlinearity of PFOS increased obviously with decreasing solution pH and increasing [Ca(2+)], resulting in the potential importance of BC at environmentally low PFOS level, from solution at high [Ca(2+)] or low pH. The role of BC in PFOS sorption was significantly influenced by environmental conditions and solute aqueous concentrations.
研究了 pH 值和 [Ca(2+)] 变化的溶液中，全氟辛烷磺酸 (PFOS) 对油和油衍生的黑碳 (BC) 的吸附作用。油是 PFOS 的强吸附剂，与油水分配系数 (K(oil)) 不受溶液参数 (pH 值和 [Ca(2+)] 的影响) 有关，表明 PFOS 的疏水区与油之间的疏水相互作用起主导作用。在 0.5mM [Ca(2+)] 和 pH 5.05 的情况下，BC 对 PFOS 的吸附并不比其他天然有机碳更强或更非线性，表明 BC 上的特定吸附位点可能不适合 PFOS。然而，随着溶液 pH 值的降低和 [Ca(2+)] 的增加，PFOS 的吸附容量和非线性明显增加，这表明在环境低 PFOS 水平下，BC 的潜在重要性，来自高 [Ca(2+)] 或低 pH 值的溶液。BC 在 PFOS 吸附中的作用受到环境条件和溶质水浓度的显著影响。
