| 1 |
Author(s):
Nnaemeka Ejike Kingsley, Egwuonwu Gabriel Ndubuisi, Egwu Ebenezer Ojode.
Page No : 1-16
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Geophysical Investigations Inferred from Airborne Potential Field Data of Parts of the Lower Benue Trough in Nigeria
Abstract
The aeromagnetic data of Nkalagu and Abakaliki areas were interpreted using spectral analysis and modeling to estimate depth to the sedimentary thickness, nature of intrusive, susceptibility values and types of minerals associated with them. The total magnetic intensity was processed to produce the residual magnetic map which was divided into 21 overlapping blocks. Each block was subjected to a spectral program plot (SPP) developed with MATLAB to obtain depths to the top boundary Zt and depth to the centroid Z0. The spectral analysis revealed depths to the top boundary Zt, which is the depth to magnetic basement ranging from 0.77 to 2.34 km with an average value of 1.72 km and the centroid depth ranging between 2.22 and 5.93 km, with an average depth of 3.55 km. The modeling estimated depths of profile 1, 2, 3, and 4 at 5 km, 1 km, 1.68 km and 1.32 km respectively with an average depth of 2.3 km and respective susceptibility values of 0.002, 0.003, 0.003 and 0.003 respectively, indicating the presence of igneous intrusions of gabbro, diabase and metamorphosed sedimentary rocks of quartzite and schist, with iron rich minerals like pyrite, limonite, cassiterite and arsenopyrite. The maximum depth values of 2.34 km and 5 km obtained from the two depth estimation methods confirm feasibility depths for hydrocarbon accumulations. In view of the above results, it is evident that the presence of intrusions delineated from the modeling results accounts for the mineralization in the area and can also destroy any hydrocarbon present since the presence of numerous intrusions are an indication of exceedingly high temperature history.
| 2 |
Author(s):
Ubongabasi Uwem Utuk, Prof. Atulomah N..
Page No : 17-32
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Knowledge, Attitude, Perception and Health-Seeking Behaviour Regarding Occupational-Risk of Cement-Dust Exposure Among Lafarge Workers in Ewekoro Ogun State, Nigeria
Abstract
Introduction: Inadequate knowledge, negative attitude, poor perception, and poor health seeking-behaviour on the part of the workers are some of the problems resulting in health issues that are associated with occupational hazards. Hence, this study investigated the knowledge, attitude, perception and health-seeking behaviour regarding occupational risk of cement dust exposure among Lafarge workers in Ewekoro LGA, Ogun State, Nigeria. Methodology: A multistage probability sampling method was adopted to select the workers working in Lafarge company in Ewekoro, Ogun State. Result: Most (151; 62.9%) of the workers had high knowledge regarding cement dust exposure. Most (170; 70.8%) of the workers had negative attitudinal disposition towards cement dust exposure. Most (163; 67.9%) of the workers had poor perception towards cement dust exposure. Most (173; 72.1%) of the respondents had poor health seeking behavior regarding cement dust. Conclusion: In the study, it was established that most of the factory workers had good knowledge regarding occupational risk exposure to cement dust. Despite this satisfactory knowledge, a majority of the workers showed a negative attitude towards occupational risk exposure to cement dust. The workers were also found to have poor perception. Negative attitude and poor perception towards risk of cement dust exposure contributed to the workers’ inadequate health seeking behavior.
| 3 |
Author(s):
Green A.F., Owoh A.A., Anaero-Nweke G.N., Wokoma O.A.F..
Page No : 33-42
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Assessment of Physico-Chemical Parameters of Water from Iwofe River, Rivers State, Nigeria
Abstract
This study is aimed at assessing the physico-chemical parameters of water from the Iwofe River which is heavily stressed by extensive anthropogenic activities like bunkering. Two stations were established and surface water samples were collected bi-monthly at each station for one year. All the parameters were determined in-situ except biochemical oxygen demand (BOD) which was analyzed in the laboratory on the fifth day of sample collection. The results obtained show that pH varied from 5.66 and 6.87, dissolved oxygen (DO) ranged between 3.51 and 5.16 mg/l. Temperature had values ranging between 27.85 and 31.25 oC; salinity ranged between 5.96 and 11.54 ppt; conductivity ranged between 9.55 and 10.46 us/cm. The total dissolved solid (TDS) ranged between 7.15 and 13.63 mg/l and biochemical oxygen demand (BOD) was between 0.85 and 2.84 mg/l. Seasonal fluctuations revealed that mean values of DO, TDS, salinity and temperature were higher during the dry season while pH and BOD were higher in the wet season, but mean conductivity values were uniform for both seasons. The study has shown that despite the visible anthropogenic perturbations in the study area, the surface water is still relatively clean.
| 4 |
Author(s):
Onyishi G.E., Ugwu G.Z., Onyishi S.E..
Page No : 43-50
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Reservoir Characterization of an Onshore Geofield in Niger Delta, Nigeria, using Offset Well Data
Abstract
Three wells (GE_11, G_12 and G_13) in an onshore geofield in the Niger Delta, Nigeria, were used to characterise the reservoirs of the oil field. RokDoc (5.1) and Petrel (2014.1) software were employed for data analysis and characterisation of the reservoirs. A comprehensive petrophysical analysis of each well was carried out in other to ascertain the physical properties such as shale volume, porosity, fluid saturation, net pay thickness and gross pay thickness. The well information was also used to evaluate the lithology and hydrocarbon depth. The hydrocarbon depths in the reservoirs ranged from 3292 to 4121 m, while the hydrocarbon saturation ranged from 0.671 to 0.982. The water saturation ranges from 0.042 to 0.446, while the porosity ranges from 0.145 to 0.216. The bulk volume of water was estimated to vary from 0.015 to 0.025. The reservoir units across the three wells have parameters detailing a characteristically hydrocarbon-bearing reservoir.
| 5 |
Author(s):
Nzemeka Olisah C., Ugwu Gabriel Z., Onyishi George E..
Page No : 51-59
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2D Resistivity Imaging for Leachate Migration in Nkwelle-Ezunaka Farm Estate, Southeastern Nigeria
Abstract
Leachate effluence from wastewater Leachate migration and solid waste are major sources of soil and groundwater pollution. Assessing the impact of leachate is an active area of soil and groundwater research. This study evaluated the extent of leachate migration at Nkwele-Ezunaka Farm Estate in Anambra State of Nigeria using a 2D resistivity imaging technique. The study area lies within longitude 6° 51' 27'' − 6° 59' 37'' E and latitudes 6° 13' 18'' − 6° 20 '27" N and covers an area of about 60 km2. A total of five profile lines were carried out in a resistivity survey using a digital read-out resistivity meter (ABEM SAS 1000). The data obtained were interpreted using RES2DINV software. A contaminant leachate plume was delineated in 2D resistivity sections as low resistivity zones (less than 80.0 Ωm). The maximum depth of penetration of leachate determined was 10.6 m and hence could not penetrate the groundwater in the study area. The groundwater flow in the study area was revealed to be in the West-East direction.
| 6 |
Author(s):
Iyasele Obinyonifoh Belinda, Dr. Dangana M..
Page No : 60-81
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Determinants of Waste Disposal Practicies Among Residents of Agege Local Government Area of Lagos State Nigeria
Abstract
Inadequate knowledge, negative attitude, poor perception on the part of the residents are some of the problems resulting from poor waste disposal practices. Hence this study investigates determinants of waste disposal practices among residents of Agege local government Lagod state Nigeria. Methodology: A multistage probability sampling method was adopted to select the residents in Agege Local Government, Lagos State. RESULT: Majority of the respondents, 40.9% had a high level of knowledge about waste disposal practice. 70.8% of the respondents had a positive attitude. 55.7% of the respondents had a fair level of perception towards waste disposal. 56% of the residents had average waste disposal practice. CONCLUSION: The study established that the residents of Agege had a good level of knowledge regarding waste disposal practices, this reflected in their attitude and perception towards waste disposal practice.
| 7 |
Author(s):
Raphael Eze Nnam, Chukwuemeka S. Ugah, Chihurumnanya Ola Oji, Ifeanyi Spencer Ephraim Nwaorgu.
Page No : 82-96
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Effect of Packaging Material and Storage Environment on the Physiochemical Properties of Processed Tomato
Abstract
The study evaluated the effect of glass, plastic and high-density polyethylene packaging materials on the physiochemical properties of processed tomato (Solanum lycopersicum L.) stored under two different environments for a period of three months (12 weeks). Two samples of Solanum lycopersicum L. of the tomato concentrate were packed in each of the above-mentioned packaging materials with one sample stored in a dark environment (dark cupboard) and the other stored where it receives sunlight. The result shows that the storage period, storage environments and packaging materials had effects on the parameters evaluated. While the MC%, TSS, Sugar-Acid ratio and pH of the stored samples increased across all packaging material and environments, TA, colour, lycopene and beta-carotene content of the samples decreased across all storage material and environment. The result also indicated that the quality of samples stored in the dark environment were better than those stored under sunlight.
| 8 |
Author(s):
Olukayode O.O., Bayewu O.O., Adebisi N.O., Mosuro G.O., Ariyo S.O., Orimogunje O.B..
Page No : 97-112
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Multi-Criteria Analysis Method for Aquifer Vulnerability Investigation Using Godt Method at Idi-Ayunre, Ibadan, Southwestern Nigeria
Abstract
Geophysical investigation involving Vertical Electrical Sounding (VES) Schlumberger array was carried out across Idi-Ayunre, Ibadan, a typical basement complex area having a rock composition of migmatite-gneiss, quartzite, and biotite-hornblende. A total of forty (40) vertical electrical sounding data were acquired with maximum current electrode separation of 100m using resistivity meter and its accessories. The aim of the study was to evaluate the aquifer vulnerability of the study area to contamination. The VES results were both qualitatively and quantitatively interpreted using partial curve matching and were further subjected to computer iteration using WINRESIST. The longitudinal conductance, thickness of layer overlying aquifer and hydraulic conductivity were generated and synthesized to produce the vulnerability map. A GODT multi-criteria model which is an acronym of Groundwater occurrence, Overburden thickness, Depth and Topography developed from the hydrogeologic parameters were evaluated alongside the longitudinal conductance values to determine the aquifer vulnerability of the area and to classify the study area accordingly. The curve type obtained are H and HA. The interpretation revealed three to four geoelectric layers: the topsoil (18.9-178.9Ωm), clayey (9.0-70.6Ωm), fractured basement (31.9-43.1Ωm) and fresh basement (1131-2916Ωm). The longitudinal unit conductance ranges from 0.032-0.93mhos. And from the GODT model derivations, the study area shows 92.5% of high vulnerability rating, 2.5% of low-moderate and 5% of moderate rating; areas with high rating are prone to contamination than areas with low-moderate and moderate rating. Hence, zones of high vulnerability may be not be encouraged for groundwater exploitation and, if need be, constant water quality assessment should be carried out before consumption.
