“…This approach to reducing the mobility of metals consists of adding chemically-reactive mineral amendments to establish vegetation with metal-tolerant plant species (Berti and Cunningham, 2000). A large number of amendments have been tested, including lime (Li and Chaney, 1998;Hamon et al, 2002), Fe and Mn oxyhydroxides (Mench et al, 1994a;Mench et al, 1994b;Mench et al, 2000;Mench et al, 2003a), hydroxylapatite (Chlopecka and Adriano, 1996;Cotter-Howells and Caporn, 1996;Laperche et al, 1996;Greman et al, 2001;Seaman et al, 2001), alumino-silicates including zeolite (Chlopecka and Adriano, 1996;Knox et al, 2001) and beringite (Vangronsveld et al, 1995a;Vangronsveld et al, 1995b;Vangronsveld, 1998), and steel residues including Thomas basic slag (Mench et al, 1994a;Mench et al, 1994b) and steel shot (Sappin-Didier, 1995;Mench et al, 2003a). Beringite, steel shot, and hydroxylapatite are particularly efficient and lasting amendments, especially when used in combination (Boisson-Gruppen, 1999;Mench et al, 2003b).…”