Abstract
Different types of waste consisting of everyday items from different sources that are discarded by the public are commonly disposed at the bank of a river in which vegetables are planted. The vegetables planted are assumed to be polluted with some heavy metals as a result of municipal waste. These heavy metals accumulate in the body and enter through the food. The heavy metals sometimes are so much in the body that they pose a great hazard to human body. Four heavy metals Lead (Pb), Chromium, (Cr), Cadmium (Cd), and Zinc (Zn) were studied in comparison with FAO/WHO standard.The research was carried out in Ogbomoso at three different locations Arada, Ikose and Beulah. Vegetables sample were uprooted at the river bank of these locations at three varying distances (10m, 15m and 20m) away from the river. The vegetables samples were kept in a labeled brown envelopes and oven dried for 48 hours at 23 o C to remove moisture. The dried samples were then taken to the Institute of Agricultural Research and Training at Ibadan for analysis.The results showed that the level of concentration of Pb, Cr, Cd and Zn found in the vegetable planted in riparian area of Ogbomoso are safe for human consumption because the metals found were in conformation with FAO/WHO standard. DOI : 10.7176/JBAH/9-18-05 Publication date :September 30 th 2019
Highlights
Vegetables are essential components of natural ecosystems, they are a highly beneficial food for humans and large amounts are consumed daily (Cobb et al, 2000)
The enveloped samples were taken to the laboratory of the Department of Agronomy, Ladoke Akintola University of Technology, Ogbomoso to analyse for the concentration of Lead (Pb), Chromium (Cr), Cadmium (Cd) and Zinc (Zn)
Heavy Metal Concentration in Vegetable Samples The results show that the concentration of heavy metal around the riparian area was not affected by the distance
Summary
Vegetables are essential components of natural ecosystems, they are a highly beneficial food for humans and large amounts are consumed daily (Cobb et al, 2000). Vegetable represents the first compartment of the terrestrial food chain. Some leafy vegetables are well-known trace metal accumulators, making accumulation of trace metals in the edible parts of vegetables a direct pathway for their incorporation into the human food chain (Florigin, 1993). Due to their capacity of toxic metals accumulating, when they grow on soils polluted with such metals, they represent a threat to the living beings which consume them. The main sources of heavy metals to vegetable crops are their growth media from which these are taken up by the roots. A better understanding of metals sources, their accumulation in the soil and subsequent uptake by plant species is important in present day research on risk assessment (Mohajer and Mohammed, 2012)
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