UTILIZATION OF SCENT LEAF (OCIMUM GRATISSIMUM) AS BIOINDICATOR OF HEAVY METALS PRESENCE IN AUTOMOBILE WORKSHOP IN OLD IKANG ROAD, CALABAR
Abstract
ABSTRACT
This study assessed heavy metal concentrations in Ocimum gratissimum (scent leaf) obtained from an automobile workshop and a vegetable garden in Calabar, Nigeria, to evaluate its potential as a bioindicator of environmental pollution. C041eeted samples from automobile workshop in Old Ikang Street and vegetable garden were prepared and analyzed fo s heavy metals (Fe, Cu, Pb and Zn) using Atomic Absorption Spectlophotometer (AAS). The mean concentrations of Fe (9.2403—9.2293 mg/kg), Cu (1.2143—1 2027 mg/kg), and Zn (4.2463 4.2313 mg/kg) exceeded FAO/WHO maximum permissible limits, while Pb levels (().0257 0.0340 mg/kg) remained within safe limits. Correlation analysis revealed significant positive and 'negative relationships among metals, suggesting multiple pollution sources. The results ind icate that O. gratissimum readily accumulates heavy metals from its growing environment, making it a reliable bioindicator of soil and atmospheric contamination. This highlights the need for continuous monitoring of edible plants in urban environments to safeguard public health.
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