Azibaola Inengite | Niger Delta University (original) (raw)

Papers by Azibaola Inengite

Asian Food Science Journal, 2018

African Journal of Environmental Science and Technology, 2010

Concentrations of Fe, Pb, Cr, Ni and V were measured in sediments taken from eight (8) sampling s... more Concentrations of Fe, Pb, Cr, Ni and V were measured in sediments taken from eight (8) sampling stations along a section of Kolo creek which traverses an oil flow station and a point in Epie creek which receive effluent discharges from human and industrial activities. The study was conducted in four seasons (Dry, Late Dry, Rainy and Late Rainy Seasons). Vanadium was less than 0.001 mg/Kg in all the samples analysed. Fe, Pd, Cr and Ni had annual means of 5109.85, 1.60, 14.22 and 10.18 mg/Kg respectively. One way ANOVA at 95% confidence limit showed no significant difference in the nine (9) sampling stations. However, there was significant difference in the four (4) seasons that the study was conducted. Cluster analysis of the data further classified the four seasons into two groups. Geoaccumulation indices showed that the Creek is not polluted by Pb, Cr and Ni, however, it is highly polluted with Fe. The highest positive correlation was between Pb and Cr while the highest negative correlation was between Fe and Ni. Compared to DPR intervention values, Kolo creek is free from pollution by Pb, Cr and Ni.

European Journal of Environment and Earth Sciences

This study was conducted to monitor the impact of human activities on the air quality of Port Har... more This study was conducted to monitor the impact of human activities on the air quality of Port Harcourt Metropolis, during and after the Covid-19 Lockdown period where human activities were brought to an all-time low. Ten selected locations, evenly distributed around Port Harcourt Metropolis were studied while Rivers State University served as the Control Site. The meteorological parameters studied alongside carbon monoxide were atmospheric temperature, relative humidity, wind speed, and wind direction. Standard methods were applied in capturing data in-situ, using hand-held devices. Data were collected for six months capturing rainy and dry season months and the lockdown periods. Air Quality Indices were also calculated for CO. The results obtained reveal that meteorological data gathered were characteristic of the study area. The values of carbon monoxide were higher in the Sampling Sites with a mean range of (0.632 – 3.291) ppm in the rainy season and (0.422 – 9.037) ppm in the dr...

American Journal of Applied Chemistry, 2015

Zn/Fe-CO 3 layered double hydroxide was synthesis by co-precipitation method for the adsorption o... more Zn/Fe-CO 3 layered double hydroxide was synthesis by co-precipitation method for the adsorption of lead ions in aqueous solution. The synthesized layered double hydroxide (Zn/Fe-CO 3) was then characterized by Powder X-ray Diffraction (PXRD), Fourier Transform Infrared (FT-IR) and SEM/EDX analysis. The experimental data fitted both Langmuir and Freundlich isotherms with regression correlation coefficient values of 0.9999 and 0.999 respectively. The essential thermodynamic parameters of ∆H o , ∆S o , ∆H x and E a were calculated to be-4.8327KJ/mol, 12.8J/molK, 13.3KJ/mol and-1.948KJ/mol, thus showing the exothermic nature of the process and the randomness of the system. The low activation energy (E a) value is consistent with physical adsorption. The results also fitted zero-order kinetic, first-order kinetic and pseudosecond order models.

International Research Journal of Pure and Applied Chemistry, 2015

This study assessed total hydrocarbon content (THC) and polycyclic aromatic hydrocarbon (PAH) in ... more This study assessed total hydrocarbon content (THC) and polycyclic aromatic hydrocarbon (PAH) in an oil spill contaminated soil in Rumuolukwu community in Niger Delta. The study was carried out between August 2013 to January 2014. THC and PAH were analyzed using standard procedure. PAH in the contaminated soil for both season were predicted using Diagnostic Ratios [Ant/(Ant+Phe), Flt/(Flt+Pyr), BaA/(BaA+Chr), Flt/Pyr and BaP/(BaP+Chr)]. PAH and THC concentration were higher in August 2013 (wet season) compared to January 2014 (dry season), indicating natural attenuation as the study period increases. Also, higher concentration of PAH and THC were observed at less depth (0-15cm) compared to higher depth (15cm-60cm). Based on diagnostic ratio, PAH sources present in the oil contaminated soil depicted the predominance of mixed pyrogenic activities such as petroleum, biomass and coal combustion. Petrogenic sources were observed close to the point source.

Journal of Chemistry

Generation-3 polyamidoamine (PAMAM) dendrimer was implanted on silica to produce a very good adso... more Generation-3 polyamidoamine (PAMAM) dendrimer was implanted on silica to produce a very good adsorbent (G-3 PAMAM-SGA). The composite was characterized and used for the removal of Cd(II) ions from aqueous solution. Kinetic data fit the Lagergren pseudo-second-order model and also follow the intraparticle diffusion kinetic model to an extent, which is an indication that the sorption process is controlled by both mechanisms: intraparticle/film layer and adsorption inside the pores/crevices of the composite. Equilibrium sorption data of Cd(II) on G-3 PAMAM-SGA fit the Freundlich isotherm (R2 = 0.9993) which is indicative of multilayered adsorption that occurred on heterogeneous surfaces. The ΔG° values for all temperatures studied were negative, which indicated a spontaneous and feasible process. The result implies that G-3 PAMAM-SGA is a promising adsorbent for microscale scavenging of Cd(II) ions in aqueous solutions.

This study assessed the nutrient composition (including sulphate, nitrate and phosphate) and elec... more This study assessed the nutrient composition (including sulphate, nitrate and phosphate) and electrical conductivity in an oil spill contaminated soil along Shell Petroleum Development Company Right of way in Rumuolukwu, Eneka, Port Harcourt. Oil spill contaminated soil and control samples (50 m away from the contaminated site) were collected at different depth i.e. 0- 15cm, 15 - 30 cm, 30 – 45 cm and 45 – 60 cm across a period of 6 months i.e. August to October, 2013 (Wet season) and November 2013 to January 2014 (dry season). The samples were prepared and analyzed using standard procedures. The mean result at various depth for wet and dry season was 18.2 and 41.7 µS/cm (electrical conductivity), 1.5 and 1.9 mg/kg (nitrate), 4.2 and 4.7 mg/kg (sulphate), 0.62 and 0.68 mg/kg (phosphate) respectively. The electrical conductivity and nutrient concentration in an oil spill contaminated soil were lower than the control soil. Also the concentration during the wet season was lower than th...

This study assessed heavy metals (Ni, Pb, Cr and V) in oil spill contaminated soils in Rumuolukwu... more This study assessed heavy metals (Ni, Pb, Cr and V) in oil spill contaminated soils in Rumuolukwu community, Eneka, Obio/Akpor Local Government Area, Rivers State, Niger Delta region of Nigeria. Ex-situ analysis was carried out for 6 months i.e. 3 months wet and dry seasons each. The samples were collected at different depth using soil auger. The samples were processed and analyzed using flame atomic absorption spectrophotometer. Results ranged from 0.16 – 3.02 mg/kg Ni, 0.20 – 8.14 mg/kg Pb, 0.18 – 7.88 mg/kg Cr and 0.01 – 0.20 mg/kg V for oil spill contaminated soil. The concentration of heavy metals (Ni, Pb, Cr and V) was higher than the control samples, but below Department of Petroleum Resource Nigeria Limit. Ecological risk factor showed that the contamination level is low at various depth, however instance of moderately and considerable contamination were observed at 45 – 60 cm and 15 – 30 cm depth for Pb during the wet season. Also, contamination factor showed moderate conta...

CITATION: Ayawei, N. et al. (2015). Mg/Fe layered double hydroxide for removal of lead (ii): Ther... more CITATION: Ayawei, N. et al. (2015). Mg/Fe layered double hydroxide for removal of lead (ii): Thermodynamic, equilibrium and kinetic studies. ABSTRACT Mg–Fe–CO 3 layered double hydroxide (LDH) with a Mg/Fe molar ratio of 3:1 was synthesized by co-precipitation method and characterized using X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy/ Energy-Dispersive X-ray Spectroscopy (FESEM/EDX). The Freundlich and Langmuir isotherms were plotted with correlation coefficient values of 0.9995 and 0.9998 respectively, confirming the suitability of the layered double hydroxide for adsorption. The thermodynamic parameters, viz. ΔH o , ΔS o were calculated to predict the nature of adsorption. The negative and positive values of ΔH o and ΔS o respectively, indicating that the adsorption process is spontaneous and exothermic in nature. The adsorption process followed zero-order kinetics, first-order kinetic model and second-orde...

Journal of Scientific Research and Reports

Three different crude oil samples from three crude oil flow stations in Bayelsa state, Nigeria, w... more Three different crude oil samples from three crude oil flow stations in Bayelsa state, Nigeria, were chosen for this study and were used to analyze the geochemical characteristics such as thermal maturity, depositional environments, sources of organic matter and extent of biodegradation. The crude oil samples were separated into saturated hydrocarbons, aromatic hydrocarbons and polar compounds. The saturated hydrocarbons were determined by Agilent (HP) 5890 Series II gas chromatography equipped with a Flame Ionization Detector (California, USA). Ratios of the biomarkers pristane/phytane, Isoprenoids/n-alkanes and CPI were determined. The pristane/phytane ratio in the oils reflects that the oils originated mainly from a source rock with a significant terrestrial contribution deposited under oxic environment with high maturation level due to the high pr/ph ratio of the oils. The ph/n-C 18 ratios of the oils were less than one (< 1.0) suggesting that the oils were non-biodegraded. The CPI values of the three crude oil samples were below 1.0 indicating that the crude oil samples can be described as matured.

In the present work, Zn/Al layered double hydroxide of ratio 2:1 was synthesis by co-precipitatio... more In the present work, Zn/Al layered double hydroxide of ratio 2:1 was synthesis by co-precipitation method from their nitrate salts and utilized as adsorbent for the removal of lead ions from aqueous solution. The synthesized Zn/Al-CO 3 was characterized by SEM, XRD and FTIR. The effect of various parameters such as contact time, initial concentration and variable temperature were investigated. The results show that the adsorption process was depended on contact time rather than temperature and concentration. Studies of the essential thermodynamic parameters shows that the adsorption process was rapid, exothermic and spontaneous and also fitted both Langmuir and Freundlich isotherm. The results of various kinetic models are zero-order kinetics model R 2 =1, second-order kinetic model R 2 = 0.998 and pseudo-second order kinetics model R 2 = 0.999.

International Journal of Chemical and Process Engineering Research, 2014

British Journal of Applied Science & Technology, 2015

Knowledge of the acid value (AV), peroxide value (PV), iodine value (IV) and iron concentration (... more Knowledge of the acid value (AV), peroxide value (PV), iodine value (IV) and iron concentration (quality-index variables) in oils is an indication of the edibility of the oil because these are parameters of oil-deterioration. The semi-processed oil is used to prepare a delicacy called "banga soup" in the Niger Delta region (Bayelsa State, Nigeria) in the ratio of 7:3 of the oil and other components. It is also a common practice to eat raw oil directly from the fruit. In this work, the edibility of raw, semi-processed and completely-processed oils were tested by measuring the quality-index variables. The raw oil (R-OIL) was obtained by scrapping the oil-bearing out part of the fruit with plastic knife. Semi-processed oil (SM-OIL) was the skim resulting from the mixture of milled fruit and hot water. The skim was heat-purified to give the completely processed oil (CP-OIL). 5g of oil was used for each analysis but the sample for FAAS was digested with aqua regia. Analyses were done by titrimetric methods for acid value, peroxide value, and iodine value and FAAS was used to determine the concentration of iron. In the raw oils from both samples (E. guineensis and E. oleifera), the acid values, peroxide values, iodine values and concentration of iron were above the recommended maximum Codex Standard for edible oils but values were within recommended range for the semi-and completely processed oils. The results indicate the nonedibility of raw oil.

Environment and Natural Resources Research, 2014

Water hyacinth (Eichhornia crassipies) has proved to be a menace in water bodies and studies are ... more Water hyacinth (Eichhornia crassipies) has proved to be a menace in water bodies and studies are on, in the direction of solving this problem; one of which is to discover economic uses of water hyacinth. Adsorption of heavy metals and dyes from aqueous solutions by activated carbon derived from water hyacinth is one of such studies. In this study, dried and pulverized water hyacinth shoot was used for the sorption studies. This is in the bid of eliminating the rigours of producing activated carbon, thereby saving time and cost. The adsorption capacity of water hyacinth shoot for Methylene Blue dye was studied as a function of initial metal ion concentration in a batch system. Results showed that adsorption increased with methylene blue dye concentration. Seven adsorption isotherms, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Florry-Huggins, Harkins-Jura and Henry's isotherms were applied to the adsorption data. Isotherm parameters showed that all the isotherms correlated well with the adsorption data. The maximum adsorption capacity of Methylene Blue dye to the dried water hyacinth shoot was found to be 58.14mg/g. The use of dried water hyacinth shoot would appreciably save the time and cost for producing activated carbon but not without some compromise of efficiency.

International Journal of Environmental Science and Technology, 2013

The flood in 2012, which was recorded as the most devastating in the past 40 years in Nigeria, th... more The flood in 2012, which was recorded as the most devastating in the past 40 years in Nigeria, that caused colossal loss in material wealth, could also be a source of heavy metal pollution, especially at the lower reaches of the flood where deposition of flood transported materials occurs. Heavy metals (Fe, Ni, Cd, Cr, Zn, Cu and Pb) concentrations were determined in soil samples from two locations, an area submerged by the flood water (flooded) and an area at a higher elevation than the flood water (unflooded), which served as the control. The soil pH, texture, Total Organic Carbon, and Cation Exchange Capacity were also determined. Standard laboratory methods were employed for all the analyses. The soil in this study was characterized as sandy/clay/loam soil following the particle size analysis, with an average pH of 4.6 in the flooded soils and 6.5 in the unflooded soils. Total Organic Carbon (TOC) ranged from (0.936-1.989)% in the flooded soil and (0.663-0.939)% in the unflooded soil. Cation Exchange Capacity (CEC) was higher in the flooded soil (1.936-3.234) meq/100 g, than in the unflooded soil (1.164-1.722) meq/100 g. The results of Inengite et al.; IRJPAC, 8(3): 175-189, 2015; Article no.IRJPAC.2015.083 176 the heavy metals revealed that heavy metals concentrations where higher in the flooded soil samples compared to the unflooded soil samples. There was also evidence of leaching of heavy metals. Eight Pollution Indices for heavy metals were applied to the data which comprised of four single pollution indices (The Contamination Factor, Ecological Risk Factor, Enrichment Factor and