Abstract
The concentrations (mg/Kg) of Cr, Co, Cu, Fe, Mn, Ni, Pb and Zn were determined in seven different vegetables which were obtained from sharada, kwakwachi and Jakara irrigation gardens in the Kano metropolis using Atomic Absorption Spectrophotometry (AAS). Samples were collected during both dry and rainy seasons. The mean levels of metals obtained ranged widely from 0.34 mg/Kg Cr to 27.35 mg/Kg Fe. The relative abundance of metals in vegetables analyzed followed the sequence Fe > Zn > Mn > Cu > Ni > Pb > Co > Cr. Reductions of metal levels ranging from 8.25% Fe in onion to 45.19% Ni in Okra were recorded in rainy season samples over those of the dry season. @JASEM
Highlights
The role of manganese in plants is undoubtedly catalytic, but, it is related in some ways in chlorophyll synthesis (Epstein 1972)
It is toxic to plants at concentration range of 1-99mg/L depending on the plant species (Walsh, 1971)
The zinc content of normal plant tissues varies according to species, but, it is usually within the range 5-300mg/Kg dry matter (Walsh, 1971)
Summary
The role of manganese in plants is undoubtedly catalytic, but, it is related in some ways in chlorophyll synthesis (Epstein 1972). It is toxic to plants at concentration range of 1-99mg/L depending on the plant species (Walsh, 1971). The levels of chromium in plants are less than 1 or 2μg/g dry matter even when growth is reduced by toxicity (Gambi, 1982). The cobalt content of normal plants is usually within the range 0.01-1.00mg/Kg dry matter (Walsh, 1971). Sludge treatment usually results in elevated zinc levels, plants do not accumulate zinc to a degree that would be toxic to animals or humans (Jeffery,1992). The zinc content of normal plant tissues varies according to species, but, it is usually within the range 5-300mg/Kg dry matter (Walsh, 1971). The metals of interest include cobalt, chromium, copper, iron, manganese, nickel, lead and zinc
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