1. Anon. Roskill's Metals Databook, sixth ed., Roskill Information Services, London, UK, 1985.
2. Zinc in the Environment;Prasad,1980
3. Zinc in the Environment;Casey,1980
4. Metal Speciation, Separation and Recovery;Peters,1987
5. Removal of Nickel(II) from Dilute Aqueous Solution by Sludge-Ash