State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China.
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China; Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
J Environ Sci (China). 2014 Dec 1;26(12):2554-61. doi: 10.1016/j.jes.2014.06.034. Epub 2014 Oct 14.
Understanding the transport of humic acids (HAs) in porous media can provide important and practical evidence needed for accurate prediction of organic/inorganic contaminant transport in different environmental media and interfaces. A series of column transport experiments was conducted to evaluate the transport of HA in different porous media at different flow velocities and influent HA concentrations. Low flow velocity and influent concentration were found to favor the adsorption and deposition of HA onto sand grains packed into columns and to give higher equilibrium distribution coefficients and deposition rate coefficients, which resulted in an increased fraction of HA being retained in columns. Consequently, retardation factors were increased and the transport of HA through the columns was delayed. These results suggest that the transport of HA in porous media is primarily controlled by the attachment of HA to the solid matrix. Accordingly, this attachment should be considered in studies of HA behavior in porous media.
了解腐殖酸（HA）在多孔介质中的迁移，可以为准确预测不同环境介质和界面中有机/无机污染物的迁移提供重要的实际依据。进行了一系列的柱输送实验，以评估在不同流速和不同入口 HA 浓度下，HA 在不同多孔介质中的输送情况。研究发现，低流速和高入口浓度有利于 HA 在填充到柱中的沙粒上的吸附和沉积，从而给出更高的平衡分配系数和沉积速率系数，这导致更多的 HA 被保留在柱中。因此，延迟因子增加，HA 通过柱的输送被延迟。这些结果表明，HA 在多孔介质中的迁移主要受 HA 与固体基质的附着控制。因此，在研究 HA 在多孔介质中的行为时，应考虑这种附着。
