International Journal of Ecology and Environmental Sciences
Preliminary studies on trace metal accumulation by aquatic weed Salvinia molesta and its implication in Phytoremediation
Abstract
Water, sediment sample and specimens of free-floating aquatic macrophyte, Salvinia molesta were collected from a Lake situated in North Goa to assess trace metal (Mn, Ni, Zn and Pb) accumulation by selected aquatic weed. The concentration of trace metals from water, sediment and S. molesta was determined using atomic absorption spectroscopy. Studies revealed that concentration of metals in water was less as compared to sediments. Brown fronds of Salvinia accumulated more concentration of trace metal as compared to green shoots. Metal accumulation in brown fronds in pre monsoon was as (Mn 3.32.ppm; Ni-0.04 ppm; Zn - 3.62ppm; Pb-BDL) while in green shoots (Mn 1.20ppm; Ni-BDL; Zn - 1.02ppm; Pb-BDL); in monsoon season the metal concentration in brown frond was (Mn 3.04.ppm; Ni-0.07 ppm; Zn – 1.93ppm; Pb-BDL) and in green shoot ( Mn 0.62ppm; Ni-BDL; Zn - 0.30 ppm; Pb-BDL); whereas in post monsoon metal concentration in brown frond was recorded as (Mn 4.75ppm; Ni-0.55 ppm; Zn - 0.25ppm; Pb-0.39ppm) and in green shoot- (Mn 1.10.ppm; Ni-0.12 ppm; Zn - 0.10ppm ; Pb-0.10ppm). Bioaccumulation and Translocation factors for metal accumulation and translocation were above 1. Study revealed that S. molesta is hyper accumulator of above trace metals therefore suitable for phytoremediation.
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References
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