Phytoremediation Potential of Vigna Unguiculata on Lead Polluted Soil and its Biotoxic Effects on Soil Microbial Activities
Keywords:
lead; vigna unguiculata; microbial activities; phytostabilization; bio-concentration factor, translocation factor; phytoremediation
Abstract
The aim of this research was to evaluate the impact of lead nitrate on soil microbial activities growth performance and the phytoremediation potential of Vigna unguiculata cowpea grown in agricultural soil Pristine sandy loam soils were polluted with nitrate salt of lead at four different levels 50mg kg 100mg kg 200mg kg and 400mg kg in triplicates A significant P 0 05 retarding effect of the metal salt on the studied parameters was observed Consistently total bacterial population was found decreasing with rise in lead dosage Lead was also found to significantly P 0 05 affect the microbial metabolism as witnessed by the lowering of CO 2 evolved in the test samples A generalized growth reduction in the performance of Vignaunguiculata observed when compared to the control showed that lead phytotoxicity was concentration dependent Bioaccumulation capacity of the plant was determined using an Atomic Absorption Spectrophotometer FS 240 AA Agilent Technology after pulverization and digestion of the plants using HCl HNO 3 3 1 v v Favourably roots appear to be a better site for metal residence than shoots The Bio-concentration Factor BCF and Translocation Factor BCF 1 3 99 TF 1 0 67 value obtained conclusively suggest that cowpea is a suitable candidate for the phytostabilization of lead contaminated soil especially at highly polluted sites
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2017-10-15
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