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Cadmium adsorption and
accumulation by Ceratophyllum demersum L.: A fresh water macrophyte
Ceratophyllum demersum (aquatic macrophyte, popularly known as coontail)
plants were treated with cadmium viz., 2.5, 5.0, 7.5 and 10.0mM for a
duration of 2, 4, 6 and 8 days to examine the amount of Cd adsorbed and
accumulated from the hydroponic system. In all treatments, Cd adsorbed to
the plant decreased with increasing treatment duration. Whereas, at a chosen
treatment of duration, Cd adsorbed to the plant increased with increasing
treatment concentration. On the other hand, Cd accumulation increased with
increasing treatment concentration as well as duration. Cd adsorption as
well as accumulation was found to be significantly correlated with the
treatment duration at all tested concentrations. However, adsorption showed
negative correlation with the treatment duration. Significant differences
were noticed between the concentrations and treatment periods for adsorption
as well as accumulation of the Cd. After 2 days treatment at 2.5mM
concentration, Cd present in the hydroponic medium was found to be
negligible. In plants treated for second time with the same Cd concentration
after washing the plants with 10mM EDTA solution for 5 minutes, Cd
adsorption was not observed. EDTA pretreatment prevented the adsorption, and
increased Cd accumulation. Based on the present study it can be concluded
that C. demersum is suitable plant to remediate Cd polluted effluents. EDTA
pretreatment would enhance the accumulation of the Cd. |
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