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.

How to Cite
KENNETH ODOH, PAUL EMENIKE MARTINS, UCHECHUKWU OKEKEAJI, UCHENNA KALU AKPI, UGBEDE SHADRACH ADOBU, Chuks. Phytoremediation Potential of Vigna Unguiculata on Lead Polluted Soil and its Biotoxic Effects on Soil Microbial Activities. Global Journal of Science Frontier Research, [S.l.], aug. 2017. ISSN 2249-4626. Available at: <https://journalofscience.org/index.php/GJSFR/article/view/2099>. Date accessed: 22 jan. 2022.