International Research Journal of Public and Environmental Health
Vol.6 (6), pp. 115-126, September 2019
Available online at https://www.journalissues.org/IRJPEH/
Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Assessment of lead (Pb) uptake and hazard potentials of cassava plant (Manihot esculentus cranz), Dareta Village, Zamfara, Nigeria
*1Udiba U. Udiba, 1Udeme U. Udofia, 2Ekom R. Akpan and 2Ekpo E. Antai
1Department of Zoology and Environmental Biology, University of Calabar, Calabar, Nigeria.
2Institute of Oceanography, University of Calabar, Calabar, Nigeria.
*Corresponding Author Email: udiba.udiba(at)yahoo.com;udibaudiba(at)unical.edu.ng
Lead (Pb) concentration in soil and cassava tissues from Dareta village was assessed using Shimadzu Atomic Absorption Spectrophotometer (model AA-6800, Japan) after wet digestion to evaluate uptake/accumulation and to estimate potential health risk due to consumption of edible tissues of the plant. The ranges of concentrations were 84.86 – 344.78 mg/kg, 1.19 – 3.75 mg/kg, 0.03 – 2.59 mg/kg and 0.02 – 0.43mg/kg for soil, cassava peels, peeled cassava roots (tubers) and cassava leaves respectively. Lead concentrations in soils were within WHO/FAO Maximum Permissible Limit. The average (Pb) concentration in peeled cassava tubers was found to be above WHO/FAO permissible limit for consumed food. Average values of Estimated Daily Intake (EDI) for cassava tubers were above the Recommended Daily Intake (RDI) and the Upper Tolerable intake (UL). Average Target Hazard Quotient (THQ) for cassava tubers was above 1.00 indicating that the perennial intake of cassava tubers from the village poses significant risk of lead Toxicity. The low mobility of (Pb) in cassava plant from root to leaves was reflected by low Translocation Factor. The large difference in lead concentrations between roots and leaves indicated an important restriction of the internal transport of the toxic metal from the roots towards the aerial parts.
Key words: Soil, lead, uptake/accumulation, permissible limits, potential hazard