Assessment of the distribution of potentially harmful trace elements in bedrocks and stream sediments of Okemesi-Ijero area, Southwestern, Nigeria

Abstract

Assessment and distribution of the concentration of potentially harmful trace elements (PHTEs) is

Assessment of particulate matter (PM2.5, PM10) in air, elemental composition of granite and weather parameters at a quarry site in Ngwogwo, Ebonyi State, Nigeria

“…The concentration of Pb increased from 0.47±0.01 (hard-core) to 2.00±0.05 mg/kg (dust particle size) and the values is well below 14.30 to 23.99 mg/kg reported in branded gneiss, granite and quartzite at Okemesi-Ijero area South Western Nigeria (Ayodele et al, 2018), 21.3 to 184.0 mg/kg in biotite granite and 6.0 to 39.5 mg/kg in mica granite in the Variscan Erzgebirge, Germany (Forster et al,1998), 2.0 to 24.0 mg/kg in volcanic rocks (Husin et al, 2015) but relatively lower than 3.0 mg/kg in igneous rock (Alloway, 1995). The differences in the concentration of the heavy metals may be attributed to locational and or environmental differences vis-à-vis differences in heat and pressure brought about by weathering processes, erosion and by compression during rock formation.…”

“…The concentration of As in the ½ inch size of chippings is 1.43, 1.12, 1.18, 1.12, 1.15, 1.47 and 1.21 times higher than values obtained from dust particle size, the 0.50 unmixed size, the 0.50 mixed size, the 3 / 7 inch size, the ¾ inch size, the 1 inch size and the hard-core, respectively. The concentration of As increased from 0.32±0.01 (1 inch size) to 0.47± 0.00 mg/kg (the ½ inch size) which is relatively lower than 0.23 to 0.90 mg/kg in branded gneiss, granite and quartzite (Ayodele et al, 2018) and 1.5 mg/kg in igneous rock (Alloway, 1995) but well below 5 to 10 mg/kg in volcanic rocks in Tawau, Sabah in Malaysia (Husin et al, 2015).…”

Geochemical Exploration for Metallic Minerals in the Meta-Sedimentary Rocks of Ogotun, Ikeji-Ile and Ipetu, Southwestern Nigeria

“…The nature and the occurrences of such metallic minerals that may likely be present in the study area could only be unravelled with a detailed mineral exploration program. Many notable researchers have worked on the Ilesha schist belt such as Onougu and Ferrante (1965); Hubbard (1975); Elueze (1981); Abiodun (2011) and Ayodele, Oshin, and Awokunmi (2017). The discovery of gold in Ilesha schist belt could be the gravitating factor that attracted the interest of these researchers to Ilesha schist belt.…”