TABLE 6.

Some amendments used for the stabilization of heavy metals in contaminated soils.

Amendment	Heavy metal	References
Flyash	Pb	Ciccu et al. (2003)
Cyclonic Ash	Cd, Pb, and Zn	Brown et al. (2005)
Cement and rice husk ash	Pb	Yin et al. (2006)
Phosphate amendment	Pb	Cao et al. (2009)
Phosphogypsum	Pb	Rodríguez-Jorda et al. (2010)
Zeolite	Cd	Lin et al. (1998)
Lime	Cu, Fe, and Zn	Khan and Jones (2009)
Zeolite	Cu and Zn	Fawzy (2008)
Mono calcium phosphate- Calcium carbonate	Cd, Cu, Ni, Pb, and Zn	Wang et al. (2001)
Phosphate rock and phosphoric acid	Zn, Cu, and Pb	Cao et al. (2009)
Biochar derived from Stems of willow	Cd, Cu, Pb, and Zn	Trakal et al. (2011)
Biochar derived from hardwoods	As, Cd, and Zn	Beesley and Marmiroli (2011)