Duke Okoro - Academia.edu (original) (raw)

Papers by Duke Okoro

Nigerian Journal of Soil Science, 2009

The experiment was conducted to fractionate Cu and Zn into the exchangeable, carbonate, Fe- Mn Ox... more The experiment was conducted to fractionate Cu and Zn into the exchangeable, carbonate, Fe- Mn Oxide, organic and residual fractions within 0-30, 30-60 and 60-90 cm soil depths of calcareous soils of Igarra. The results obtained indicated that mean concentration of copper was highest in the Fe/Mn oxide fraction (3.68 mg kg-1) followed by the carbonate (1.93 mg kg-1) and exchangeable fractions (1.28 mg kg-1) respectively. Hence, the distribution trend of Cu in the various fractions was in the order Fe/Mn oxide > carbonate > residual > organic. On the other hand, the amount of Zn increased with depth in the exchangeable fraction with a relatively high concentration of 9.13 mg Kg-1. However, the highest amount of Zn (12.15 mg Kg-1) was obtained in the Fe/Mn oxide fraction. Zn occurrence in other fractions decreased in the following order: Fe/Mn oxide fraction > organic > carbonate > exchangeable. The present assessment of the forms and distribution of Cu and Zn in the soil showed that higher concentration of these metals in the Fe/Mn oxide fraction suggest unavailability or low supply of these metals for possible plant uptake in the short term.

International Research Journal of Pure and Applied Chemistry, Jun 22, 2020

The potentially available and total micronutrient status in soils of derived savanna ecology of O... more The potentially available and total micronutrient status in soils of derived savanna ecology of Oyo State, Nigeria were assessed and compared with standard critical values in soils. Soil samples were collected from a land measuring 285m 2 on a line transect with the aid of a stainless soil auger. The sampling depths were 0-15 cm, 15-30 cm, 30-45 cm and 45-60 cm respectively. The Physico-chemical properties and micronutrient content of the soil were determined using standard methods. The mobility factor of the micronutrients revealed the following trends Zn > Fe > Mn > Cu. In all, the concentration of Mn was relatively constant irrespective of the soil depth. This study revealed that the micronutrients (Fe, Mn, Zn, and Cu) were adequate and well supplied in the soils of the area, and therefore, deficiencies of the elements are quite unlikely. Generally, the soils contained Fe, Mn, Zn, and Cu above the critical level for crop production. The application of organic matter would help to improve the overall fertility of the soil. Activities that hastens up mineralization of organic materials should be minimized in managing soil health for optimum nutrient availability. Soil testing is recommended before fertilizer use to prevent nutrient imbalance or toxicity.

Global Journal of Pure and Applied Sciences, Dec 14, 2010

The physico-chemical properties of a series of disazo dyes derived from p-aminophenol on polyeste... more The physico-chemical properties of a series of disazo dyes derived from p-aminophenol on polyester and nylon 6 substrates are described. It was found that the dyes generally have higher affinities for the polyester fibre than for the nylon 6 fibre. The values of ∆µ o , ∆H o and ∆S o in the two dye-fibre systems suggest that the hydrogen bonding mechanism is operative in the dye-fibre binding forces.

Journal of Environmental Chemistry and Ecotoxicology, May 31, 2022

Surface water quality in Niger Delta has been impaired over the years as a result of oil explorat... more Surface water quality in Niger Delta has been impaired over the years as a result of oil exploration and exploitation carried out in the region. This study investigates the anthropogenic influence on the water quality of Odeama creek. Water samples were collected during the wet and dry season from 20 sampling points and four control points and analyzed following standard methods and procedures. No statistical difference (p> 0.005) at 95% confidence interval was observed between sampling points except for nitrate values in the dry season. Some of the results observed in this study are: pH range of 7.1-8.0 and 7.12-8.3; dissolved oxygen, 4.8-5.4 and 2.12-3.69 mg/L; chemical oxygen demand, 4.8-5.4L and 2.12-3.69 mg/L; polynuclear aromatic hydrocarbons, 0.01-0.17 and 0.05-1.06 mg/L for wet and dry season, respectively. Values observed from dissolved oxygen, chemical oxygen demand, polynuclear aromatic hydrocarbons, and heavy metals except copper indicated human influence on the water quality that may be due to domestic and industrial waste, illegal bunkering activities, and corrosion of abandoned vessels in the waterway. Regular monitoring of the physicochemical parameters and standard measures should be put in place to evaluate and control anthropogenic influence on the water quality.

International journal of chemical studies, May 1, 2020

The present study was conducted to examine the effects of different land-use types on soil qualit... more The present study was conducted to examine the effects of different land-use types on soil quality indices. Surface soils were collected at 0-15 cm and 15-30 cm depth respectively from three land-use types: Cassava field, Oil palm, and Banana plantation. Samples were subjected to physical, chemical, and microbiological analyses using standard methods, and the result were subjected to descriptive statics. The extent of change in soil quality was assessed using soil quality indices as an index for soil fertility management. The result showed that oil palm plantation was highest in soil quality evaluated as compared to Banana and Cassava field. The fertility differences observed across the land use types were due to inherent soil properties such that farming practices that ensure accumulation of organic matter need to be encouraged in order to improve soil productivity. It is recommended that soil fertility management should be site-specific to enhance optimum yield and productivity.

Global Journal of Pure and Applied Sciences, Aug 24, 2007

Chemical Science International Journal

A study was carried out to examine the effect of seasonal variation on some soil chemical propert... more A study was carried out to examine the effect of seasonal variation on some soil chemical properties under different land-use in Nembe, Bayelsa State-Nigeria. The objective was to evaluate changes in soil nutrient contents in both wet and dry seasons. A total of eighteen soil samples were collected at 0-30 cm depths in August, 2017 (Wet Season) and March, 2018 (dry season) in natural forest, oil palm plantation and arable land-use and analyzed for pH, soil organic carbon (SOC), total nitrogen (N), available phosphorus (P), exchangeable cations (Ca, Na, K and Mg), and cation exchange capacity (CEC) using standard analytical methods. Results showed that soil pH was highest (4.2) under oil palm plantation in the wet season, while high content of N 0.52 mg/kg was recorded during the wet season in all the thee-land use. Organic carbon was highest 1.69 mg/kg in natural forest, followed by 1.39 and 1.04 mg/kg for oil palm plantation and arable land use. Maximum value of P 0.22 mg/kg was ob...

International Journal of Chemical and Biological Sciences

Chemical Science International Journal

Oil and gas activities are one of the environmental concerns in the crude oil-rich areas of the N... more Oil and gas activities are one of the environmental concerns in the crude oil-rich areas of the Niger Delta. This study aimed to determine the physicochemical level and some pollution indices in the soils of the Obodo community in Delta State to ascertain if there is an anthropogenic influence on the soil quality. Soil samples were collected from 14 sampling stations and 2 control stations during the wet and dry seasons from two soil depths (topsoil, 0 - 15cm) and (subsoil, 15-30cm) according to standard methods and procedures. The study results revealed elevated concentrations of total hydrocarbon content, polyaromatic hydrocarbon, total petroleum hydrocarbon and sulphate with mean values of 138.45 mg/kg (topsoil) and 147.66 mg/kg (subsoil); 52.62 mg/kg (topsoil) and 30.01 mg/kg (subsoil); 229.95 mg/kg (topsoil) and 160.33 mg/kg (subsoil); 54.89 mg/kg (topsoil) and 44.88 mg/kg (subsoil) during the wet season respectively; and mean values of 172.94 mg/kg (topsoil) and 151.46 mg...

Bulletin of the Chemical Society of Ethiopia, 2007

Carcinogenic potency of polycyclic aromatic hydrocarbons (PAHs) in soils obtained from seven diff... more Carcinogenic potency of polycyclic aromatic hydrocarbons (PAHs) in soils obtained from seven different sampling locations in Effurun metropolis and its environs of Niger Delta Area of Nigeria were evaluated. The 16 US EPA priority PAHs were determined with GC-MS. The concentrations of individual PAHs observed were used to compute the carcinogenic risk potency of the PAHs relative to benzo(a)pyrene (reference carcinogen). Benzo(a)pyrene equivalent concentration in soils from industrial sites, possess about 22 times carcinogenic potencies than soils from residential areas.

Journal of Environmental Chemistry and Ecotoxicology, Jun 30, 2022

International Research Journal of Pure and Applied Chemistry

Water resource contamination is a major concern in several regions, especially in the Niger Delta... more Water resource contamination is a major concern in several regions, especially in the Niger Delta, in which the oil exploration activities pose serious risks to human health, water resource and the environment. This present study evaluates the properties of surface water in Nembe Creek. Surface water samples were collected from three (3) control stations and twenty-four (24) sampling stations around the creek during the wet and dry seasons. The samples were subjected to analysis following the standard operating procedures of ASTM and APHA analytical methods. The relationship between the parameters and variations of surface water quality of Nembe creek were determined by using descriptive statistics, Analysis of variance (ANOVA) and Pearson correlation analysis. The results indicated pH had a mean value of 6.67± 0.33 (wet season) and 7.21 ± 0.3 (dry season), Electrical Conductivity ranged 200 – 3950 µS/cm (wet season) and 17900 – 25800 µS/cm (dry season), DO ranged between 4.3 – 5.8 ...

International Research Journal of Pure and Applied Chemistry

Effluents received by surface water increase the concentration of heavy metals and nutrients in t... more Effluents received by surface water increase the concentration of heavy metals and nutrients in the water to a level that is harmful to the aquatic organism and pose a health risk to humans. Santa Barbara River is known for its rich biodiversity; and is a fishing site in Bayelsa state, Nigeria. This study examines the physicochemical characteristics of waters in the Santa Barbara River to ascertain anthropogenic influence on the water quality. In two seasons (wet and dry), surface water samples were collected from 20 sampling stations along the Santa Barbara River and from 4 control points and analyzed according to standard methods and procedures. Total suspended solids, polyaromatic hydrocarbons, and sodium were the only parameters that showed a statistical difference between values obtained in the control and study area (p > 0.05) at 95% confidence interval. The results of polyaromatic hydrocarbons, lead, chromium and sulphate observed indicated anthropogenic influence on the w...

International Journal of Chemical Studies, 2021

The oil industry has been a growth engine to the economy of Nigeria; however, its activities such... more The oil industry has been a growth engine to the economy of Nigeria; however, its activities such as oil exploration, exploitation, spillage, refining and distribution have caused several environmental defects to its receptors of which surface water is at risk. This research examined the characteristics of surface water in oil-producing areas in the Niger Delta during the wet and dry seasons. The pH values ranged from 6.10-6.80 during the wet season and 6.25-6.92 for the dry season. This was an optimum value for the aquatic lives inhabiting these waters. However, the electrical conductivity and TDS values were relatively high for the dry season and low for the wet season, where rain could have diluted the salt content. The TDS values ranged from 2176-4036 mg/L. Polycyclic aromatic hydrocarbons concentrations varied between 0.003-0.034 mg/L for wet season and ranged from 0.008-0.0054 mg/L for the dry season. Due to the natural conditions for degradation of petroleum hydrocarbons, it is favourable with high temperatures and relatively high rainfall. In respect to this, a lower concentration was recorded for the wet season and much higher during the dry season. Value as high as 0.00-8.05 mg/l were observed for zinc which could be detrimental to human health. The continuous oil exploration and anthropogenic activities if not properly monitored, could pose serious threat to human and aquatic lives.

Chemical Speciation & Bioavailability, 2011

... There are many reports of the incidences of crude oil spillage and their effects (Osuji and N... more ... There are many reports of the incidences of crude oil spillage and their effects (Osuji and Nwoye, 2007; Hurbe, 2006). Considering the peculiar characteristics of wetlands with respect to varied degrees of physico-chemical reac-... D. Okoro, PO Oviasogie and FE Oviasogie 3 ...

Journal of Applied Sciences, 2008

Journal of Applied Sciences, 2007

Zeitschrift f�r Lebensmittel-Untersuchung und -Forschung, 1982

Polycyclische aromatische Kohlenwasserstoffe in ger~iuchertem Fisch Zusammenfassung. Die Gehalte ... more Polycyclische aromatische Kohlenwasserstoffe in ger~iuchertem Fisch Zusammenfassung. Die Gehalte an polycyclischen aromatischen Kohlenwasserstoffen (PAH) wurden in 70 R/iucherfischproben bestimmt. Bei Anwendung von Capillargaschromatographie mit Flammenionisationsnachweis wurden gleichzeitig 13 PAH bestimmt. In 19 von 46 Proben yon kommerziell ger/iucherten Fischen, hauptsfichlich aus herk6mmlichen Ofen, iiberstieg der Gehalt an Benz(a)pyren (BaP) 1 Ixg/kg. Die BaP-Gehalte in den Proben aus Rauchanlagen mit externer Raucherzeugung lagen ausnahmlos unter 1 gg/kg. Von 16 untersuchten Rfiucherfisch-Konserven enthielten 4 Proben mehr als 1 gg BaP/kg. Eine Probe eines hausger~ucherten Herings aus einem selbstgemauerten R/iucherofen wies den h6chsten Gehalt an BaP und totalen PAH dieser Untersuchung mit 11,3 und 1 100 gg/kg auf. Summary. The levels of polycyclic aromatic hydrocarbons (PAH) were determined in 70 samples of smoked fish and fish products. By application of capillary gas chromatography with flame ionization detection 13 PAH components were determined simultaneously. In 19 of 46 samples of commercially smoked fish, mainly from traditional kilns, the concentration of benzo[a]pyrene (BaP) exceeded 1 gg/kg. The BaP levels in the samples from kilns with external smoke generation were without exception lower than 1 gg/kg. Four of 16 canned smoked fish samples contained more than 1 gg/kg of BaP. A sample of "homesmoked" herring from a home-made bricked kiln showed the highest level of BaP and total PAH in this study, 11.3 and 1,100 lag/kg, respectively.

Bulletin of the Chemical Society of Ethiopia, 2007

In the months of May and June, 2008, about 20 deaths from CO poisoning were reported in Nigeria. ... more In the months of May and June, 2008, about 20 deaths from CO poisoning were reported in Nigeria. Ignorance along with lack of information and data about this toxic substance can be blamed for these deaths. In this study, a preliminary attempt is made to evaluate the diurnal trend in CO generation and distribution at several road junctions and motor parks in Benin City. A dosimeter (in situ method) that uses an electrochemical sensor to measure ambient levels of CO was used. At the 5 sampling locations selected, very high CO concentrations were measured with a mean range of 14.8-28.3 ppm. The 10.0 ppm statutory limit set by the Federal Ministry of the Environment, Housing and Urban Development (FMEH&UD) was clearly exceeded. Diurnal variations in the data were statistically significant (P < 0.05), with the highest CO concentrations recorded in the morning hours. Spatial variations were also statistically significant, with the highest mean CO load of 28.3 ppm measured at Sokponba r...

Nigerian Journal of Soil Science, 2009

The experiment was conducted to fractionate Cu and Zn into the exchangeable, carbonate, Fe- Mn Ox... more The experiment was conducted to fractionate Cu and Zn into the exchangeable, carbonate, Fe- Mn Oxide, organic and residual fractions within 0-30, 30-60 and 60-90 cm soil depths of calcareous soils of Igarra. The results obtained indicated that mean concentration of copper was highest in the Fe/Mn oxide fraction (3.68 mg kg-1) followed by the carbonate (1.93 mg kg-1) and exchangeable fractions (1.28 mg kg-1) respectively. Hence, the distribution trend of Cu in the various fractions was in the order Fe/Mn oxide > carbonate > residual > organic. On the other hand, the amount of Zn increased with depth in the exchangeable fraction with a relatively high concentration of 9.13 mg Kg-1. However, the highest amount of Zn (12.15 mg Kg-1) was obtained in the Fe/Mn oxide fraction. Zn occurrence in other fractions decreased in the following order: Fe/Mn oxide fraction > organic > carbonate > exchangeable. The present assessment of the forms and distribution of Cu and Zn in the soil showed that higher concentration of these metals in the Fe/Mn oxide fraction suggest unavailability or low supply of these metals for possible plant uptake in the short term.

International Research Journal of Pure and Applied Chemistry, Jun 22, 2020

The potentially available and total micronutrient status in soils of derived savanna ecology of O... more The potentially available and total micronutrient status in soils of derived savanna ecology of Oyo State, Nigeria were assessed and compared with standard critical values in soils. Soil samples were collected from a land measuring 285m 2 on a line transect with the aid of a stainless soil auger. The sampling depths were 0-15 cm, 15-30 cm, 30-45 cm and 45-60 cm respectively. The Physico-chemical properties and micronutrient content of the soil were determined using standard methods. The mobility factor of the micronutrients revealed the following trends Zn > Fe > Mn > Cu. In all, the concentration of Mn was relatively constant irrespective of the soil depth. This study revealed that the micronutrients (Fe, Mn, Zn, and Cu) were adequate and well supplied in the soils of the area, and therefore, deficiencies of the elements are quite unlikely. Generally, the soils contained Fe, Mn, Zn, and Cu above the critical level for crop production. The application of organic matter would help to improve the overall fertility of the soil. Activities that hastens up mineralization of organic materials should be minimized in managing soil health for optimum nutrient availability. Soil testing is recommended before fertilizer use to prevent nutrient imbalance or toxicity.

Global Journal of Pure and Applied Sciences, Dec 14, 2010

The physico-chemical properties of a series of disazo dyes derived from p-aminophenol on polyeste... more The physico-chemical properties of a series of disazo dyes derived from p-aminophenol on polyester and nylon 6 substrates are described. It was found that the dyes generally have higher affinities for the polyester fibre than for the nylon 6 fibre. The values of ∆µ o , ∆H o and ∆S o in the two dye-fibre systems suggest that the hydrogen bonding mechanism is operative in the dye-fibre binding forces.

Journal of Environmental Chemistry and Ecotoxicology, May 31, 2022

Surface water quality in Niger Delta has been impaired over the years as a result of oil explorat... more Surface water quality in Niger Delta has been impaired over the years as a result of oil exploration and exploitation carried out in the region. This study investigates the anthropogenic influence on the water quality of Odeama creek. Water samples were collected during the wet and dry season from 20 sampling points and four control points and analyzed following standard methods and procedures. No statistical difference (p> 0.005) at 95% confidence interval was observed between sampling points except for nitrate values in the dry season. Some of the results observed in this study are: pH range of 7.1-8.0 and 7.12-8.3; dissolved oxygen, 4.8-5.4 and 2.12-3.69 mg/L; chemical oxygen demand, 4.8-5.4L and 2.12-3.69 mg/L; polynuclear aromatic hydrocarbons, 0.01-0.17 and 0.05-1.06 mg/L for wet and dry season, respectively. Values observed from dissolved oxygen, chemical oxygen demand, polynuclear aromatic hydrocarbons, and heavy metals except copper indicated human influence on the water quality that may be due to domestic and industrial waste, illegal bunkering activities, and corrosion of abandoned vessels in the waterway. Regular monitoring of the physicochemical parameters and standard measures should be put in place to evaluate and control anthropogenic influence on the water quality.

International journal of chemical studies, May 1, 2020

The present study was conducted to examine the effects of different land-use types on soil qualit... more The present study was conducted to examine the effects of different land-use types on soil quality indices. Surface soils were collected at 0-15 cm and 15-30 cm depth respectively from three land-use types: Cassava field, Oil palm, and Banana plantation. Samples were subjected to physical, chemical, and microbiological analyses using standard methods, and the result were subjected to descriptive statics. The extent of change in soil quality was assessed using soil quality indices as an index for soil fertility management. The result showed that oil palm plantation was highest in soil quality evaluated as compared to Banana and Cassava field. The fertility differences observed across the land use types were due to inherent soil properties such that farming practices that ensure accumulation of organic matter need to be encouraged in order to improve soil productivity. It is recommended that soil fertility management should be site-specific to enhance optimum yield and productivity.

Global Journal of Pure and Applied Sciences, Aug 24, 2007

Chemical Science International Journal

A study was carried out to examine the effect of seasonal variation on some soil chemical propert... more A study was carried out to examine the effect of seasonal variation on some soil chemical properties under different land-use in Nembe, Bayelsa State-Nigeria. The objective was to evaluate changes in soil nutrient contents in both wet and dry seasons. A total of eighteen soil samples were collected at 0-30 cm depths in August, 2017 (Wet Season) and March, 2018 (dry season) in natural forest, oil palm plantation and arable land-use and analyzed for pH, soil organic carbon (SOC), total nitrogen (N), available phosphorus (P), exchangeable cations (Ca, Na, K and Mg), and cation exchange capacity (CEC) using standard analytical methods. Results showed that soil pH was highest (4.2) under oil palm plantation in the wet season, while high content of N 0.52 mg/kg was recorded during the wet season in all the thee-land use. Organic carbon was highest 1.69 mg/kg in natural forest, followed by 1.39 and 1.04 mg/kg for oil palm plantation and arable land use. Maximum value of P 0.22 mg/kg was ob...

International Journal of Chemical and Biological Sciences

Chemical Science International Journal

Oil and gas activities are one of the environmental concerns in the crude oil-rich areas of the N... more Oil and gas activities are one of the environmental concerns in the crude oil-rich areas of the Niger Delta. This study aimed to determine the physicochemical level and some pollution indices in the soils of the Obodo community in Delta State to ascertain if there is an anthropogenic influence on the soil quality. Soil samples were collected from 14 sampling stations and 2 control stations during the wet and dry seasons from two soil depths (topsoil, 0 - 15cm) and (subsoil, 15-30cm) according to standard methods and procedures. The study results revealed elevated concentrations of total hydrocarbon content, polyaromatic hydrocarbon, total petroleum hydrocarbon and sulphate with mean values of 138.45 mg/kg (topsoil) and 147.66 mg/kg (subsoil); 52.62 mg/kg (topsoil) and 30.01 mg/kg (subsoil); 229.95 mg/kg (topsoil) and 160.33 mg/kg (subsoil); 54.89 mg/kg (topsoil) and 44.88 mg/kg (subsoil) during the wet season respectively; and mean values of 172.94 mg/kg (topsoil) and 151.46 mg...

Bulletin of the Chemical Society of Ethiopia, 2007

Carcinogenic potency of polycyclic aromatic hydrocarbons (PAHs) in soils obtained from seven diff... more Carcinogenic potency of polycyclic aromatic hydrocarbons (PAHs) in soils obtained from seven different sampling locations in Effurun metropolis and its environs of Niger Delta Area of Nigeria were evaluated. The 16 US EPA priority PAHs were determined with GC-MS. The concentrations of individual PAHs observed were used to compute the carcinogenic risk potency of the PAHs relative to benzo(a)pyrene (reference carcinogen). Benzo(a)pyrene equivalent concentration in soils from industrial sites, possess about 22 times carcinogenic potencies than soils from residential areas.

Journal of Environmental Chemistry and Ecotoxicology, Jun 30, 2022

International Research Journal of Pure and Applied Chemistry

Water resource contamination is a major concern in several regions, especially in the Niger Delta... more Water resource contamination is a major concern in several regions, especially in the Niger Delta, in which the oil exploration activities pose serious risks to human health, water resource and the environment. This present study evaluates the properties of surface water in Nembe Creek. Surface water samples were collected from three (3) control stations and twenty-four (24) sampling stations around the creek during the wet and dry seasons. The samples were subjected to analysis following the standard operating procedures of ASTM and APHA analytical methods. The relationship between the parameters and variations of surface water quality of Nembe creek were determined by using descriptive statistics, Analysis of variance (ANOVA) and Pearson correlation analysis. The results indicated pH had a mean value of 6.67± 0.33 (wet season) and 7.21 ± 0.3 (dry season), Electrical Conductivity ranged 200 – 3950 µS/cm (wet season) and 17900 – 25800 µS/cm (dry season), DO ranged between 4.3 – 5.8 ...

International Research Journal of Pure and Applied Chemistry

Effluents received by surface water increase the concentration of heavy metals and nutrients in t... more Effluents received by surface water increase the concentration of heavy metals and nutrients in the water to a level that is harmful to the aquatic organism and pose a health risk to humans. Santa Barbara River is known for its rich biodiversity; and is a fishing site in Bayelsa state, Nigeria. This study examines the physicochemical characteristics of waters in the Santa Barbara River to ascertain anthropogenic influence on the water quality. In two seasons (wet and dry), surface water samples were collected from 20 sampling stations along the Santa Barbara River and from 4 control points and analyzed according to standard methods and procedures. Total suspended solids, polyaromatic hydrocarbons, and sodium were the only parameters that showed a statistical difference between values obtained in the control and study area (p > 0.05) at 95% confidence interval. The results of polyaromatic hydrocarbons, lead, chromium and sulphate observed indicated anthropogenic influence on the w...

International Journal of Chemical Studies, 2021

The oil industry has been a growth engine to the economy of Nigeria; however, its activities such... more The oil industry has been a growth engine to the economy of Nigeria; however, its activities such as oil exploration, exploitation, spillage, refining and distribution have caused several environmental defects to its receptors of which surface water is at risk. This research examined the characteristics of surface water in oil-producing areas in the Niger Delta during the wet and dry seasons. The pH values ranged from 6.10-6.80 during the wet season and 6.25-6.92 for the dry season. This was an optimum value for the aquatic lives inhabiting these waters. However, the electrical conductivity and TDS values were relatively high for the dry season and low for the wet season, where rain could have diluted the salt content. The TDS values ranged from 2176-4036 mg/L. Polycyclic aromatic hydrocarbons concentrations varied between 0.003-0.034 mg/L for wet season and ranged from 0.008-0.0054 mg/L for the dry season. Due to the natural conditions for degradation of petroleum hydrocarbons, it is favourable with high temperatures and relatively high rainfall. In respect to this, a lower concentration was recorded for the wet season and much higher during the dry season. Value as high as 0.00-8.05 mg/l were observed for zinc which could be detrimental to human health. The continuous oil exploration and anthropogenic activities if not properly monitored, could pose serious threat to human and aquatic lives.

Chemical Speciation & Bioavailability, 2011

... There are many reports of the incidences of crude oil spillage and their effects (Osuji and N... more ... There are many reports of the incidences of crude oil spillage and their effects (Osuji and Nwoye, 2007; Hurbe, 2006). Considering the peculiar characteristics of wetlands with respect to varied degrees of physico-chemical reac-... D. Okoro, PO Oviasogie and FE Oviasogie 3 ...

Journal of Applied Sciences, 2008

Journal of Applied Sciences, 2007

Zeitschrift f�r Lebensmittel-Untersuchung und -Forschung, 1982

Polycyclische aromatische Kohlenwasserstoffe in ger~iuchertem Fisch Zusammenfassung. Die Gehalte ... more Polycyclische aromatische Kohlenwasserstoffe in ger~iuchertem Fisch Zusammenfassung. Die Gehalte an polycyclischen aromatischen Kohlenwasserstoffen (PAH) wurden in 70 R/iucherfischproben bestimmt. Bei Anwendung von Capillargaschromatographie mit Flammenionisationsnachweis wurden gleichzeitig 13 PAH bestimmt. In 19 von 46 Proben yon kommerziell ger/iucherten Fischen, hauptsfichlich aus herk6mmlichen Ofen, iiberstieg der Gehalt an Benz(a)pyren (BaP) 1 Ixg/kg. Die BaP-Gehalte in den Proben aus Rauchanlagen mit externer Raucherzeugung lagen ausnahmlos unter 1 gg/kg. Von 16 untersuchten Rfiucherfisch-Konserven enthielten 4 Proben mehr als 1 gg BaP/kg. Eine Probe eines hausger~ucherten Herings aus einem selbstgemauerten R/iucherofen wies den h6chsten Gehalt an BaP und totalen PAH dieser Untersuchung mit 11,3 und 1 100 gg/kg auf. Summary. The levels of polycyclic aromatic hydrocarbons (PAH) were determined in 70 samples of smoked fish and fish products. By application of capillary gas chromatography with flame ionization detection 13 PAH components were determined simultaneously. In 19 of 46 samples of commercially smoked fish, mainly from traditional kilns, the concentration of benzo[a]pyrene (BaP) exceeded 1 gg/kg. The BaP levels in the samples from kilns with external smoke generation were without exception lower than 1 gg/kg. Four of 16 canned smoked fish samples contained more than 1 gg/kg of BaP. A sample of "homesmoked" herring from a home-made bricked kiln showed the highest level of BaP and total PAH in this study, 11.3 and 1,100 lag/kg, respectively.

Bulletin of the Chemical Society of Ethiopia, 2007

In the months of May and June, 2008, about 20 deaths from CO poisoning were reported in Nigeria. ... more In the months of May and June, 2008, about 20 deaths from CO poisoning were reported in Nigeria. Ignorance along with lack of information and data about this toxic substance can be blamed for these deaths. In this study, a preliminary attempt is made to evaluate the diurnal trend in CO generation and distribution at several road junctions and motor parks in Benin City. A dosimeter (in situ method) that uses an electrochemical sensor to measure ambient levels of CO was used. At the 5 sampling locations selected, very high CO concentrations were measured with a mean range of 14.8-28.3 ppm. The 10.0 ppm statutory limit set by the Federal Ministry of the Environment, Housing and Urban Development (FMEH&UD) was clearly exceeded. Diurnal variations in the data were statistically significant (P < 0.05), with the highest CO concentrations recorded in the morning hours. Spatial variations were also statistically significant, with the highest mean CO load of 28.3 ppm measured at Sokponba r...