Authors: M Khosravi M Taghi Ganji R Rakhshaee
Publish Date: 2013/08/05
Volume: 2, Issue: 1, Pages: 35-40
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 Znsu2+ 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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