ASSESSMENT OF HEAVY METALS IN AGROECOSYSTEMS IN OTUOKE, BAYELSA STATE

Abstract

This study assessed heavy metal contamination in agricultural soils from Otuoke, Bayelsa State, Nigeria. Soil samples from two sites (with and without pesticide application) were analyzed for lead (Pb), cadmium (Cd), chromium (Cr), arsenic (As), and mercury (Hg) using Atomic Absorption Spectrophotometry. Lead concentrations were slightly higher in the pesticide-treated site (Site 2), averaging 0.771 mg/kg, compared to 0.741 mg/kg in the untreated site (Site 1). Cadmium levels were 0.066 mg/kg in Site 2 and 0.040 mg/kg in Site 1. Chromium concentrations were 0.036 mg/kg and 0.024 mg/kg in Site 2 and Site 1, respectively. Arsenic and mercury were not detected in either site. While detected levels were below WHO/FAO permissible limits (Pb: 100 mg/kg, Cd: 3 mg/kg, Cr: 100 mg/kg), the trend indicates potential agrochemical-related contamination. The findings highlight the need for ongoing monitoring to prevent future heavy metal accumulation.