Dr. OMOKO EJIRO NEWTON
Publication Title Assessing the Effects of Heavy Metal Concentration in Stream Sediments Within Onne and Environs Southeastern Nigeria
Publication Type journal
Publisher Journal of Environment and Earth Science
Paper Link 10.7176/JEES/9-10-05
Publication Authors Omoko Ejiro Newton Ahiarakwem Cosmas Ahamefula Ibeneme Sabinus Ikechukwu
Year Published 2019-10-10
Abstract This study assessed the seasonal variations in heavy metal concentration of stream sediments in parts of Onne,
Rivers state Southeastern Nigeria. River Ogu was mapped for the collection of stream sediments because of its
prominence as a receptor of a lot of effluents discharge from the NNPC oil refinery, erosion and weathering of
heavy metals from nearby towns. Stream sediment samples were obtained from eleven (11) strategic locations at
3km interval and; a control sample was obtained from Akpajo river to cover both the dry and wet seasons. Samples
were analyzed with Atomic Absorption spectrometric method (AAS) and X-ray fluorescence spectroscopy (XRF)
for Ni, Cu, Hg, Pb, Zn,Cd, As and Cr. The record of the relative abundance of the heavy metals in the stream
sediments in decreasing order for both seasons is as follows; Zinc (Zn) > Nickel (Ni) > Cadmium (Cd) > Copper
(Cu) > Chromium (Cr) > Mercury (Hg) > Lead (Pb) > Arsenic (As). Higher mean concentration values were
generally recorded in the wet season than in dry season. Four elements (Zn, Cd, Ni and Cu) were found to be far
higher than tolerable standard of the Federal Ministry of Environment (FME, 2006). The sources of the heavy
metals are attributed to Onne refinery, Onne waste dump, runoff from roadside soil, acidic precipitation and
effluents from petrochemical industries. Excessive concentrations of heavy metals in the stream sediments affects
the aquatic life of the faunas and floras and have adverse effect on humans and this calls for regular monitoring of
the chemistry of stream sediments in the area.
Keywords: Heavy metal, stream sediments, Atomic Absorption Spectrometry (AAS), x-ray fluorescence
spectroscopy (XRF), River Ogu, Onne .
Publication Title Nonrelativistic solutions of Schrödinger equation and thermodynamic properties with the proposed modified Mobius square plus Eckart potential
Publication Type journal
Publisher Heliyon 8 (2022) e08952
Publication Authors C.P. Onyenegecha a,b,?, I.J. Njoku a, A.I. Opara a,b, O.K. Echendu a,b, E.N. Omoko a, F.C. Eze a, C.J. Okereke a, E. Onyeocha a, F.U. Nwaneho a
Year Published 2022-02-09
Abstract We obtain solutions of Schrödinger equation for the modified Mobius square plus Eckart (MMPSE) potential
via the formula method. Numerical results are reported. In addition, the partition function ???? and other
thermodynamic properties such as vibrational free energy, ????, vibrational internal energy, ????, vibrational entropy,
????, and vibrational specific heat, ???? are presented. We also discuss special cases of this potential. Our result is
consistent with previous studies in the literature.
Publication Title Air Quality Assessment in Parts of Onne, Rivers State Southeastern Nigeria
Publication Type journal
Publisher Creative Commons CC-BY 4.0
Publication Authors Omoko, E.N., Onyekuru S.O., Opara A.I., Usen, O.S., Ukpong A.J, Adikwu S.O
Year Published 2021-10-29
Abstract The quality of air, noise level, wind direction, wind speed, relative humidity,
temperature and total suspended particulate (TSP) in parts of Onne in Eleme Local
Government Area of Rivers State, south-south Nigeria, were determined using
portable hand held air monitors and anemometer. The gaseous parameters measured
were sulphur dioxide (SO2), nitrogen dioxide (NO2), hydrogen sulphide (H2S), carbon
monoxide (CO), hydrocarbon (CXHY) and volatile organic carbon (VOCs). The peak
values of SO2, NO2, H2S, CO, CXHY, VOCs, wind speed, temperature, noise and
relative humidity obtained in the area were 50.94ug/m3
(TSP), 27.47ug/m3
(SO2),
124.78ug/m3
(NO2), 59.47ug/m3
(CO), 23.43ug/m3
(H2S), 521.32ug/m3
(CXHY),
890.22ug/m3
(VOCs), 4.53m/s (Wind Speed), 70.37Db(A)(Noise),
31.520C(Temperature), 70.37Db(A) Noise and 78.38%(Relative Humidity)
respectively. The results reveal that there is a high concentration of CO, CXHY, H2S,
NO2, VOCs and noise level in location ON4. The concentration of CO in location ON4
surpasses the Federal Ministry of Environment (FMENV) and International Finance
Corporation (IFC) / World Health Organization (WHO) limit/guidelines and therefore
poses environmental health concern for the inhabitants of the area. The quality of air
in the area is poor and need to be regularly monitored. The air pollutants can contribute
considerably to global warming, acid rain deposition, respiratory and cardiovascular
conditions. The air pollutants can be mitigated using scrubbers, enacting serious air
quality policies and implementing same, employment of segmented operation by
industries and constant air quality monitoring.
Publication Title Evaluating the Constituents Concentration of Contaminants in Hand-dug Wells in Onne Southeastern Nigeria
Publication Type journal
Publisher • Environmental Review Letters
Publication Authors Omoko, E. N
Year Published 2021-05-03
Abstract The study focused on evaluating the constituents concentration of contaminants in hand-dug
wells in Onne southeastern Nigeria evaluate the constituents’ concentration of contaminants in
hand-dug wells in Onne southeastern Nigeria and ascertain its seasonal variations (Dry and
Wet). The study adopted standard method to determine the concentration of associated water
quality parameters analyzed in accordance with standard methods of (APHA 1998) including
pH, Electrical conductivity, Total dissolved solid, Turbidity, Total Chloride, Total Alkalinity, Total
hardness, Nitrate, Sulphate, Phophate, Bicarbonate, Calcium, Soldium, Potassium, Total
cyanide, Copper, Lead, Cadmium, Chromium, Mercury, Nickel, Arsenic, Betex, Total Petroleum
Hydrocarbon, oil and Grease, Vanadium, Zinc, Selenium, Total iron and Magnesium. From the
results obtained, the concentration of Na, Mg, Ca and Zn were lower than the limit set by
regulatory body for drinking water in all the seasons. The concentration of Cl, Cu, Pb, Cd, As,
Hg, Ni, V, and Se during the dry season were not in conformity with the 2006 established
standard limit for safe drinking water. For the wet season, it was revealed that the pH of Cl, Cu,
Pb, Cd, As, Hg, Ni, and Se were also not in conformity with regulatory standards. Additionally,
from the values of 0.768 and 0.770 obtained for the Pollution Index for Onne hand dug well covering
dry and wet seasons, this study recommended further treatment of the water for human consumption.
Publication Title A Review of the Mechanism and Engineering/Environmental Problems of Subsidence Due to Groundwater Extraction (Withdrawal)
Publication Type journal
Publisher IIARD International Journal of Geography and Environmental Management
Publication Authors Omoko E.N., Okeke O.C., & Opara K.D.
Year Published 2018-04-04
Abstract For decades, the increase in the exploitation of groundwater for agricultural and industrial
development accompanied with successive droughts has seriously reduced the level of
groundwater leading to land subsidence. The utilization of groundwater resources is of high
importance and has become very crucial in the last decades, especially in coastal areas of
arid and semi-arid regions. Groundwater withdrawal results in fluid pressure change in the
layers. The pressure change in the layers induces both elastic and inelastic land compaction.
The elastic compaction can be recovered if the water level rises again and inelastic
compaction becomes permanent. Many major river deltas in the world are subsiding and
consequently become increasingly vulnerable to flooding and storm surges, salinization and
permanent inundation. The impacts of subsidence are potentially severe in terms of damage
to surface utility lines and structures, changes in surface-water and ground-water conditions,
and effects on vegetation and animals. Although subsidence cannot be eliminated, it can be
reduced or controlled in areas where deformation of the ground surface would produce
dangerous or costly effects. This study reviews the engineering and environmental problems
of subsidence due to groundwater withdrawal.