Aquatic Ecology and Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
Environ Pollut. 2012 Feb;161:23-9. doi: 10.1016/j.envpol.2011.09.043. Epub 2011 Oct 21.
Contaminated sediments can be remediated by adding carbonaceous materials (CM), e.g. activated carbons (AC). Here, we analyze published datasets from AC amendment trials to identify variation in the effectiveness of AC in reducing porewater concentrations of hydrophobic organic contaminants (HOCs). The analysis uses a model that separates the contribution of HOC sorption to AC by parameterzing the sorption contributions by amorphous organic matter and black carbon (BC). It appears that sorption to BC increased with LogK(OW), whereas sorption to AC showed a relatively narrow range of affinity properties with a median Freundlich LogK(F,)(AC) value of 7.2 (μg/kg(AC))/(μg/L)(n) (IQR = 7.0-7.5) for polychlorinated biphenyls (PCBs) and 8.6 (IQR = 8.3-8.8) for polycyclic aromatic hydrocarbons (PAHs). Estimated Freundlich exponents were n(F,)(AC) = 0.74 for PCBs and 0.82 for PAH. Sorption to AC was stronger than to BC for chemicals below LogK(OW) = 6.3-6.6. For HOC risk reduction this is favorable, because chemicals with low K(OW) show generally higher bioavailable concentrations.
受污染的沉积物可以通过添加碳质材料（CM），例如活性炭（AC）来修复。在这里，我们分析了已发表的 AC 修正试验数据集，以确定 AC 在降低疏水性有机污染物（HOC）的孔隙水浓度方面的有效性的变化。该分析使用了一种模型，该模型通过将无定形有机物和黑碳（BC）的吸附贡献参数化，来分离 HOC 对 AC 的吸附作用。似乎 BC 的吸附随 LogK(OW)而增加，而 AC 的吸附则表现出相对较窄的亲和力范围，其多氯联苯（PCBs）的中值 Freundlich LogK(F,)(AC)值为 7.2（μg/kg(AC))/(μg/L)(n)（IQR = 7.0-7.5），多环芳烃（PAHs）为 8.6（IQR = 8.3-8.8）。对于 PCBs 和 PAH，估计的 Freundlich 指数分别为 n(F,)(AC) = 0.74 和 0.82。对于 LogK(OW) < 6.3-6.6 的化学品，AC 的吸附作用要强于 BC。对于降低 HOC 风险而言，这是有利的，因为具有低 K(OW)的化学品通常具有更高的生物可利用浓度。
