1. Cotton FA, Wilkinson G (1988) Advanced inorganic chemistry, 5th edn. Wiley, New York
2. Balzani V, Carassiti V (1970) Photochemistry of coordination compounds. Academic Press, London
3. Nriagu JO (1994) Sci Total Environ 154:1
4. Campell NA (1990) Biology, 2nd edn. Benjaming/Cummings Publishing Company Inc, Redwood City,
p 41
5. Schroeder WH, Munthe J (1998) Atmos Environ 32:809