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Toxic effect of Pb, Cd, Ni and Zn on Azolla filiculoides in the International Anzali Wetland

Author(s): M. Khosravi | M. Taghi Ganji | R. Rakhshaee

Journal: International Journal of Environmental Science and Technology
ISSN 1735-1472

Volume: 2;
Issue: 1;
Start page: 35;
Date: 2005;
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Keywords: Azolla filiculoides | bioaccumulation | living biomass | heavy metals

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 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.
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