7 New barrier materials: the use of tailored ligand systems for the removal of metals from groundwater: D. Efficiency of contaminant attenuation.

Information on the efficiency of PANSIL, a modified polyacronitrile (PAN)-coated silica sand, from chapter 7 of the book "Long-Term Performance of Permeable Reactive Barriers," is presented. It explores the binding mechanism to PANSIL and evaluates its efficacy in scavenging over a wide range of chemical conditions. It describes experimental results such as the column breakthrough test, infrared study, and batch exposure tests with synthetic groundwater. Factors affecting the performance of PANSIL are discussed.