In this study, the seasonal variations in concentrations of heavy metals - As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn soil crops from a farm near refuse dump site Obafemi Awolowo University, Ile-Ife, Nigeria were investigated during two major seasons Nigeria. This was done to assess pollution status hence safety levels produced. Soil crop samples collected 2005/2006 rainy dry treated digested using standard wet digestion methods.  Heavy determined with Atomic Absorption Spectrophotometer...

Nitrite (NO2-) and nitric oxide (NO) have been identified as an environmentally hazardous analytes from discharged industrial effluents. Thus in this study, nickel (NiO) hydroxide (Ni(OH)2) nanoparticles were synthesized using the complexation-precipitation method their catalytic properties towards NO2- NO investigated. The success of synthesised was confirmed characterisation techniques, such X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) Fourier transformed...

This study determined the presence and levels of Polycyclic Aromatic Hydrocarbons (PAHs) groundwater in Moro, Edun-Abon, Yakoyo Ipetumodu communities Ife-North Local Government Area Osun State. was with a view to create public awareness about safety as source for domestic purposes (e.g., drinking, cooking etc.) non-industrial area. Water samples were collected on seasonal basis, comprising three months (August–October) wet season (December–February) dry season. The PAHs water extracted...

Organochlorine pesticides (OCPs) are persistent whose usage have been banned or restricted worldwide and the presence of its residues in vegetables could affect nutritional quality as well cause adverse health effects. This study quantified OCP residue levels commonly grown consumed assessed carcinogenic non-carcinogenic risks from consumption contaminated vegetables. The extract were determined using a Gas Chromatograph coupled with Electron Capture Detector (GC-ECD). Health risk estimates...

Electrocatalytic behaviour of graphene oxide (GO), iron(<sc>iii</sc>) (Fe₂O₃) and Prussian blue (PB) nanoparticles towards nitrite (NO₂⁻) nitric (NO) oxidation was investigated on a platinum modified electrode.

In this study, electrochemical nanosensors were developed from the synthesized metal oxide (MO) nanoparticles by supporting it on a gold electrode (Au). The activity of nanosensor toward detection malaria biomarker (β-hematin) was determined and optimum conditions at which maximum quantification occurred established. β-Hematin current response sensors higher when compared with bare Au followed order Au-CuO (C) > (M) Au-Fe2O3 Au-Al2O3 Au. stable relatively low drop (10.61-17.35 %) in analyte....

Biodiesel has gained wide acceptance as an alternative energy source despite its high cost of production. This study investigated the possibility lowering biodiesel production by exploring use readily available biological materials such egg-shell (ES), pineapple peel (PP) and cow bone (CB) catalysts. The effect refining process on chemical properties used vegetable oil was also examined. refined transesterified yield 76%, 78% 88.3% were obtained for ES, PP CB catalyzed samples, respectively....

This study examined the effect of degumming process on physicochemical and biodiesel properties six non-conventional oils in Nigeria extracted from seeds flesh Terminalia catappa (seed), Irvingia gabonesis Glycine max Persea americana(flesh), Tithonia diversifolia Dacryodes edulis(flesh). The fruits were air-dried to constant weight pulverized. Oil was milled sample using Soxhlet extraction method. degummed 300 μg/mL NaCl solution obtain refined (degummed) oil. Physicochemical both crude...

Artisanal gold mining can help reduce poverty while creating job possibilities for many low-income and unskilled workers. However, it is an activity with several detrimental societal consequences. Miners are exposed to chemical toxins that have long-term health This study examined soil degradation, pollution, environmental hazards from artisanal in Ibodi-Ijesa, Osun State, Nigeria. The aim assess the levels of Cu, Co, Cd, Pb, As, Ni area as potential indicators concerns. Soil samples were...

The potential usage of activated carbon from plantain peel (Musa paradisiaca) (TPPC) and unactivated (UPPC) for the removal Hexachlorocyclohexanes (HCHs) water systems was investigated. TPPC UPPC were characterized using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM). Adsorption experiments conducted as a function adsorbent weight (2 – 10 g), temperature (30 -50 °C), solution pH - 9) under an packed column. Optimum efficiency 98.23 % achieved in column...

Bread loaves randomly sampled from nine outlets and bakeries within Ile-Ife were analysed to determine their safety levels for human consumption with respect bromate trace metal contents. Bromate determination was carried out via spectrophotometric method while metals in the digested bread samples profiled using Flame Atomic Absorption Spectrophotometer. analyzed ranged 2.051 ± 0.011 μg/g 66.224 0.014 of order: 0.03–0.10 Co = Pb < 0.23–0.46 Cu 2.23–6.63 Zn 25.83–75.53 Mn. This study revealed...

Levels of organochlorine pesticides (OCPs) were determined in dried cocoa beans obtained from produce stores at Ondo and Ile-Ife, Southwestern Nigeria. Cocoa samples sun to a constant weight, pulverized soxhlet extracted with dichloromethane obtain the OCPs. Qualitative identification quantitative evaluation OCPs after clean-up on silica gel accomplished aid Gas Chromatography coupled an Electron Capture Detector (GC-ECD). had mean range ND (p, p'-DDE) 82.17 ± 54.53 ng/g p'-DDT) higher than...

The study assessed the levels of organochlorine pesticides (OCPs) in eight brands (A-H) regularly consumed maize-based complementary/breakfast foods Nigeria. We also evaluated dietary exposure infants and young children to detected OCPs. OCP residues were quantified using GC-ECD. A total 10 OCPs (β-HCH, δ- HCH, heptachlor, endosulfan sulfate, aldrin, endrin, dieldrin, p,p'-DDE, p,p'-DDT methoxychlor) detected. Total burden was highest F, D, G with mean concentrations 45.98 mg kg−1, 28.54...

Seasonal levels of organochlorine pesticides (OCPs) in yam, cassava, sweet potato and cocoyam samples collected from Esa-Oke Farm Settlement, Osun State, Nigeria were evaluated. Sampling regiment for three sites lasted four months each during the dry wet seasons. The dried extracted using Soxhlet extractor with dichloromethane (DCM) as extraction solvent, while identification estimation OCPs crop filtrates, after clean-up, carried out Gas Chromatography equipped Time-of-Flight Mass...