Assessment of micronutrient and heavy metal contamination in soils near refuse dumpsites in Ughelli North, Delta State, Nigeria

Abstract

Soil quality plays a critical role in sustaining agro-ecosystems, particularly in areas adjacent to refuse dumpsites where contamination risks are high. This study investigates the levels of micronutrients and heavy metals in soils near a refuse dumpsite in Ughelli North Local Government Area, Delta State, Nigeria, comparing them to a control site with neutral soil. Soil samples were collected at varying depths (0-15 cm, 15-30 cm, and 30-45 cm) and analyzed using standard laboratory procedures, including the Double Acid Extraction Method and Flame Atomic Absorption Spectrophotometry (FAAS). Results revealed that soils from the dumpsite exhibited lower levels of essential micronutrients such as iron (Fe), manganese (Mn), and zinc (Zn), while showing elevated levels of heavy metals like nickel (Ni) and mercury (Hg) compared to the control site. The control site, by contrast, demonstrated better soil quality, with higher organic carbon content, total nitrogen, and a more neutral pH. The findings indicate significant soil degradation and potential environmental risks associated with refuse dumpsites, emphasizing the need for proper waste management and soil remediation strategies to safeguard agricultural productivity and environmental health in the region.

Keywords

• heavy metal
• micronutrients
• soil properties
• dumpsite
• ughelli