Elucidation of the Physicochemical Characteristics and Health Risk Assessment of Heavy Metals in the Sediment of Ajoki River, Ikpoba-Okha Local Government Area in Edo State, Nigeria
Sediments play a critical role in aquatic pollution studies, functioning both as sinks and potential secondary sources of contaminants. Over time, pollutants become embedded within sediment layers, serving as historical records of environmental pollution. This study assessed the physicochemical properties, pollutant levels and associated health risks in sediment from the Ajoki River, located in Ikpoba-Okha Local Government Area, Edo State, Nigeria. Samples were collected over a 12-month period, covering both the wet (May-October 2022) and dry (November 2022–April 2023) seasons.