Khadijah Isimekhai - Academia.edu (original) (raw)
Papers by Khadijah Isimekhai
Petrochemical-induced groundwater contamination was investigated using an integrated GIS and phys... more Petrochemical-induced groundwater contamination was investigated using an integrated GIS and physico-chemical properties of sampled hand-dug wells close to fuel stations in Ile-Ife, Southwestern Nigeria. This was with a view to evaluating the influence of hydrocarbon spills on groundwater resources within the vicinity of the supposedly leaking underground fuel tanks. Topographic map and IKONOS image of the study area were acquired. Samples from forty-two (42) fuel stations and thirty (30) hand-dug water wells were analyzed for organic compounds such as benzene, ethylbenzene, toluene, xylene, and 1,2,4 trimethylbenzene using gas chromatography and mass spectrometry. Geographic Information System (GIS) tools were employed to examine the spatial relationships between the contaminants and to characterize their levels within the study area. Spatial analysis operations such as spatial interpolation, raster based reclassification, buffering and map overlay were employed. The results obtain...
E-waste is referred to obsolete, broken electronic devices such as mobile phones, televisions, co... more E-waste is referred to obsolete, broken electronic devices such as mobile phones, televisions, computer monitors, laptops, printers, scanners, and associated wiring (Luther, 2010). E-waste is generated in large quantities (Tang et al., 2010); the composition of the waste creates a major problem. E-waste contains more than 1000 different substances, many of which are toxic metals and organic pollutants (Robinson, 2009). These include lead and cadmium in circuit boards; lead oxide and cadmium in monitor cathode ray tubes (CRTs); mercury in switches and flat screen monitors; cadmium in computer batteries; polychlorinated biphenyls (PCBs) in older capacitors and transformers; and brominated flame retardants on printed circuit boards, plastic casings, cables and polyvinyl chloride (PVC) cable insulation that release highly toxic dioxins and furans when burned to retrieve copper from the wires (BAN, 2002). Also, polybrominated diphenyl ethers (PBDEs) are used as brominated flame retardant...
It has been recognised that the informal E-waste recycling may pose a risk to human health and th... more It has been recognised that the informal E-waste recycling may pose a risk to human health and the environment, this study aims to evaluate the e-waste contamination and the environmental and human health impact of informal e-waste recycling on the exposed population using the risk assessment framework. The distribution of a number of heavy metals in soil from an informal recycling site in the largest market for used and new electronics and electrical equipment in West Africa was investigated. The extent of pollution, potential bioavailability of heavy metals, potential risk due to the recycling activities and impact of external factors such as rainfall were assessed. In recent times, bioaccessibility has emerged as a testing tool used to accurately estimate the risk posed on human health by exposure to environmental contaminants, the oral bioaccessibility and inhalation bioaccessibility was also assessed. The concentrations of all the identified metals in the recycling site were co...
Petrochemical-induced groundwater contamination was investigated using an integrated GIS and phys... more Petrochemical-induced groundwater contamination was investigated using an integrated GIS and physico-chemical properties of sampled hand-dug wells close to fuel stations in Ile-Ife, Southwestern Nigeria. This was with a view to evaluating the influence of hydrocarbon spills on groundwater resources within the vicinity of the supposedly leaking underground fuel tanks. Topographic map and IKONOS image of the study area were acquired. Samples from forty-two (42) fuel stations and thirty (30) hand-dug water wells were analyzed for organic compounds such as benzene, ethylbenzene, toluene, xylene, and 1,2,4 trimethylbenzene using gas chromatography and mass spectrometry. Geographic Information System (GIS) tools were employed to examine the spatial relationships between the contaminants and to characterize their levels within the study area. Spatial analysis operations such as spatial interpolation, raster based reclassification, buffering and map overlay were employed. The results obtain...
E-waste is referred to obsolete, broken electronic devices such as mobile phones, televisions, co... more E-waste is referred to obsolete, broken electronic devices such as mobile phones, televisions, computer monitors, laptops, printers, scanners, and associated wiring (Luther, 2010). E-waste is generated in large quantities (Tang et al., 2010); the composition of the waste creates a major problem. E-waste contains more than 1000 different substances, many of which are toxic metals and organic pollutants (Robinson, 2009). These include lead and cadmium in circuit boards; lead oxide and cadmium in monitor cathode ray tubes (CRTs); mercury in switches and flat screen monitors; cadmium in computer batteries; polychlorinated biphenyls (PCBs) in older capacitors and transformers; and brominated flame retardants on printed circuit boards, plastic casings, cables and polyvinyl chloride (PVC) cable insulation that release highly toxic dioxins and furans when burned to retrieve copper from the wires (BAN, 2002). Also, polybrominated diphenyl ethers (PBDEs) are used as brominated flame retardant...
It has been recognised that the informal E-waste recycling may pose a risk to human health and th... more It has been recognised that the informal E-waste recycling may pose a risk to human health and the environment, this study aims to evaluate the e-waste contamination and the environmental and human health impact of informal e-waste recycling on the exposed population using the risk assessment framework. The distribution of a number of heavy metals in soil from an informal recycling site in the largest market for used and new electronics and electrical equipment in West Africa was investigated. The extent of pollution, potential bioavailability of heavy metals, potential risk due to the recycling activities and impact of external factors such as rainfall were assessed. In recent times, bioaccessibility has emerged as a testing tool used to accurately estimate the risk posed on human health by exposure to environmental contaminants, the oral bioaccessibility and inhalation bioaccessibility was also assessed. The concentrations of all the identified metals in the recycling site were co...