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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 2, No. 1, 2005-2006, pp. 35-40
Bioline Code: st05005
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 2, No. 1, 2005-2006, pp. 35-40

 en Toxic effect of Pb, Cd, Ni and Zn on Azolla filiculoides check for this species in other resources in the International Anzali Wetland
M. Khosravi, M. Taghi Ganji and R. Rakhshaee

Abstract

The limitation of plant growth in the polluted mediums can be used as a factor to determine of plant tolerance and the toxic effect of these mediums. In this work, the effect of Pb2+, Cd2+, Ni2+ and Zn2+ (individually) on Azolla filiculoides check for this species in other resources growth in the aqueous solution and using this method to water post treatment were studied. During 15 days the biomass the fresh Azolla with initial mass of 20 g was grown on the nutrient solution containing these metal ions, each in a concentration 4 mg/l. The presence of these ions, caused about 25%, 42%, 31% and 17% inhibition of biomass growth, respectively, in comparison to Azolla control weight which had not heavy metals. The water salinity of 1, 2 and 4 g. NaCl/l decreased the removal of these heavy metals about 4-7%, 20-24% and 40-55%, respectively. The addition of total dissolved solids (TDS) from 50 to 300 ppm. (as CaCO3) into the samples of containing heavy metals increased Azolla growth, but decreased the control Azolla growth.

Keywords
Azolla filiculoides, bioaccumulation, living biomass, heavy metals

 
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