Assessment of Toxic Metals in Soil and Vegetable Samples from Irrigated Farmland in Kaduna Metropolis, Nigeria

Type Journal Article - International Journal of Science and Research
Title Assessment of Toxic Metals in Soil and Vegetable Samples from Irrigated Farmland in Kaduna Metropolis, Nigeria
Author(s)
Volume 2
Issue 2
Publication (Day/Month/Year) 2013
Page numbers 48-52
URL http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.657.7034&rep=rep1&type=pdf
Abstract
Levels of Cd, Cr and Pb in (mg/kg) were determined in topsoil and vegetable samples from irrigated farmland using Atomic
Absorption Spectrophotometer (AAS). The vegetables available as at the time of sampling and sample collection were spinach and
'yakuwa' leaves. The soil physico-chemical parameters, pH and percentage organic matter (%OM) content were also determined. Levels
of Cd, Cr and Pb in all the soils were 0.1-6.5, 2.00-38.00 and 2.90-24.00 mg/kg dry weight, respectively. Concentration ranges of all the
plants were 0.01-1.00, 0.80-8.00 and 0.20-11.00 mg/kg dry weight for Cd, Cr and Pb respectively. The soil pH showed slightly acidic to
neutral which ranged from 5.05-7.50 while the soil percentage organic matter ranged from 0.29-2.23%. The mean concentrations of soil
and plant samples studied were found to follow the decreasing orders; Cr > Pb > Cd and Pb > Cr > Cd respectively. There is correlation
between soil physico-chemical parameters and metals such as Cr and Pb in soil samples while for vegetable plants there is correlation
between metals such as Cd, Cr and Pb content. The levels of toxic metals are within tolerable levels except for Cd in soil and Pb in
vegetable samples that has values which are higher than the FAO/WHO recommended values The slightly high level of Pb in the
vegetables could be ascribed to deposits of the metal from vehicle emissions.

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