Kolo, B. G



This research focuses on food security and hazards; study was carried out to appraise the concentration of heavy metals in leafy – vegetables that are cultivated in Damboa, Nigeria. Fresh vegetables samples were obtained from the farms, in two Villages, trans-ported to the Laboratory and were analyzed using Atomic Absorption Spectrophotome-tric (AAS) techniques as described by method of AOAC, (1990).

The results showed variation in concentration of eight heavy metals analyzed; (cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), lead (Pb) and zinc (Zn)) from the result, in GumsuriTolori village, revealed that, in lettuce (lactuca sativa)., the mean concentration levels ranges from 0.79 (51 %) to -1.1 (-71 %) µg / L. Cd had the highest concentration levels at 0.70 µg / L, followed by Cu, Ni, Mn, Cr, Zn, Fe and least was Pb ( – 1.1µg / L).

Spinach (Amaranthscaudatus), reveals mean concentration levels ranges from 1.15 (40%) to – 0.6 (-21%) µg / L. Fe had highest concentration levels of 1.15 µg / L out of the metal appraised, seconded by Cd, followed by Ni, Cr and Cu, Mn, Zn and the least was Pb (- 0.6 µg / L). GumsuriRitawa village, revealed that, lettuce contained higher concentration levels ranged from 4.6 µg / L (65.4 %) to -5.7 µg / L (-0.4 %). Cd had highest amount, and followed by Fe. There was lesser amount of Ni, Mn, Zn and Cr with a negative value of Pb, Cu had not being found in lettuce. Finally, spinach contained concentration levels ranged from 1.1 µg / L (91.5 %) to -2.0 µg / L (-17.9 %). It revealed higher amount of Fe, followed by Cd and Znc. With less amount of Ni, Mn, Cr and Cu, and a negative value of Pb at -2.0 µg / L (17.9 %) only. These were within the recommended values by WHO/FAO standard. Thus, vegetable cultivated in this area was found fit for consumption as at the time of analysis.


Amaranthscaudatus, Concentration level, Heavy metal,,Lactuca sativa, Leafyvegetable, Standard value.


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Name: Gwana, Adamu Mohammed, Office Address: Laboratory Unit, Department of An-imal Health and Production Technology, MohametLawan College of Agriculture, PMB. 1427, Maiduguri, Nigeria.

2Department of Basic Science and Technology, MohametLawan College of Agriculture, Maiduguri, Nigeria

Laboratory Unit, Department of Animal Health and Production Technology, Mohamet-Lawan College of Agriculture, Maiduguri, Nigeria

4Department of Planning, Research and Development, Nigerian Institute of Science Laboratory Technology, Ibadan, Nigeria

5Department of Microbiology and Virology, Faculty of Veterinary Medicine, University of Maiduguri, Maiduguri, Nigeria

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