“…The number of reactive hydroxyls per gram is referred to as the specific hydroxyl number. Previously, we have used this method to quantify the number of hydroxyls that react with TFS (n TFS ) for fiberglass, volcanic glasses, and clay minerals (Fry et al, 2003;Washton et al, 2008;Sanders et al, 2010). For kaolinite surfaces, we demonstrated that TFS binds exclusively to edge sites and that our reactive surface site quantification was proportional to AFM edge surface area measurements (Sanders et al, 2010).…”