BIOTECHNOLOGICAL POTENTIAL OF AZOLLA FILICULOIDES,
AZOLLA MICROPHYLLA AND AZOLLA PINNATA FOR BIOSORPTION
OF PB(II), MN (II), CU (II) AND ZN(II)
N. Jafari, Z. Senobari and R.K. Pathak
Abstract
Azolla, an aquatic fern is an ideal candidate for exploitation in constructed wetlands for treating metalcontaminated
wastewaters. The aim of this paper was to investigate the capacity of a small water fern,
Azolla spp. namely A. microphylla, A. pinnata and A. filiculoides (Azollaceae), to purify waters polluted by
Pb2+,Cu2+, Mn2+ and Zn2+. Many plants are capable of accumulating heavy metals (called hyperaccumulators)
and one of them is the water fern. The highest bioconcentration potential of Pb2+, Cu2+, Mn2+ and Zn2+ was
observed by A. microphylla (94%), A. filiculoides (96%), A. pinnata (71 %) and A. microphylla (98 %) respectively.
It was observed that upto 10 mg/L of copper, lead, zinc and manganese, the fern was able to survive
without any apparent negative side effects on its growth. All the three species showed increased accumulation
of metals when the concentration of metals in the medium was increased. It could be proposed that
all species were highly efficient in Pb2+, Cu2+, Mn2+ and Zn2+ uptake.
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