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Trace Metal Contents in Some Brands of Canned Tomato Paste in Nigerian Market
Chukwujindu M.A. Iwegbue,Chukwudumebi L. Overah,Sarah O. Nwozo,Godwin E. Nwajei
American Journal of Food Technology , 2012,
Abstract: Concentrations of metals (copper, zinc, lead and iron) were examined in some popular brands of canned tomato paste in Nigerian markets with a view of providing information on the risk associated with the consumption of these products. Samples of some popular brands of tomato pastes canned in metallic containers were analyzed for levels of copper, zinc, lead and iron after acid digestion by atomic absorption spectrophotometry. The mean concentrations (mg kg-1) ranged from <0.9-4.28 for Cu, 0.25-10.75 for Zn, <0.3-1.82 for Pb and <1.0-112.8 for Fe. The concentrations of the metals examined in the samples were present at levels below statutory limits in foods except for lead. This may pose a real danger to consumers, since tomato paste is so commonly consumed and bioaccumulation of Pb can have serious consequence to human health.
Evaluation of human exposure to metals from some commonly used hair care products in Nigeria
Bice S. Martincigh,Chukwujindu M.A. Iwegbue,Godwin E. Nwajei,Grace Obi,Omotekoro S. Emakunu
- , 2016, DOI: 10.1016/j.toxrep.2016.10.001
Abstract: The concentrations of nine metals, namely, cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), cobalt (Co), nickel (Ni), manganese (Mn), zinc (Zn), and iron (Fe), were determined in 26 brands of hair care products including hair relaxers, conditioners and shampoos. The study was aimed at providing information on the possible risks arising from heavy metals associated with the use of these products. The concentrations of the metals were determined by means of atomic absorption spectrophotometry after digestion of the samples with a mixture of acids. The concentrations of the respective metals in hair relaxers, shampoos and conditioners were found to be 0.8–2.5, 0.6–3.0,
Risk of human exposure to metals in some household hygienic products in Nigeria
Bice S. Martincigh,Bulouebibo Lari,Chukwujindu M.A. Iwegbue,Francis E. Egobueze,Godswill O. Tesi,Godwin E. Nwajei,Omotekoro S. Emakunu
- , 2019, DOI: 10.1016/j.toxrep.2019.08.014
Abstract:
Trace metals distribution in synodontis membranaceus, sediments, Asystasia Gangetica and Platostoma Africanium from Ofuafor River around Delta Glass Factory in Ughelli North Local Government Area, Delta State Nigeria
NWAJEI,GE,
NWAJEI
,G.E.

环境科学学报(英文版) , 2002,
Abstract: The trace metals analysis in synodontis membranaceus (head and tail), bottom sediments, Asystasia Gangetica and Platostoma Africanium were carried out using atomic absorption spectrometer of model Perkin Elmer 3110. Metals analysed were copper, nickel, mangenese, chromium, iron lead and cobalt. These metals were detected in the above samples. Vegetation samples concentration in copper, manganese, chromium, iron and cobalt were higher than those obtained in bottom sediments. The tail part of the fish contents of trace metals were also higher than those of the head. The results obtained in this work exceeded the results of water analysis carried out by Omoregha on the same river. Metals such as copper, nickel, manganese and chromium were below detection limit in the water from the same river. The bioaccumulation of these trace metals in these samples were traced to activities of Delta Glass Factory.
Metal Contents in Water and Aquatic Plant (Macaranga Heudelotic) from Ora River Around Nigerian Cement Factory, Nkalagu
E.C. Okafor,G.E. Nwajei
Research Journal of Biological Sciences , 2012,
Abstract: Heavy metals in water and Macarange hendelotic from Ora River by the Nigerian cement factory`s location, were determined. Metals such as Na, K, Mg, Ca, Zn, Fe, Cu, Pb and Cd were analysed using atomic absorption spectrophotometry (Atomic Absorption/Emission spectrometer 200-A). The results showed that lead concentrations were below detection limit in water samples whereas all the metals analysed in Macaranga hendelotic were all detected. Metals (Cu, Zn, Pb and Cd) concentration in Macaranga hendelotic in this study were within those levels obtained by scientist from Avicema Marine community in Shenzhen, China. Statistical analysis using spearman rank order correlation showed that Ca, Mg, K, Zn, Fe and Pb were not significant. Only Cd showed positive relationship whereas, Na and Cu were inversely correlated. Monthly variations of metal concentrations were recorded. The results further showed that Macaranga hendelotic is an adequate biological indicator of heavy metal in Nigerian Rivers.
Metal Contents in Water and Aquatic Plant (Macaranga Heudelotic) from Ora River Around Nigerian Cement Factory, Nkalagu
E.C. Okafor,G.E. Nwajei
Research Journal of Biological Sciences , 2007,
Abstract: Heavy metals in water and Macarange hendelotic from Ora River by the Nigerian cement factory`s location, were determined. Metals such as Na, K, Mg, Ca, Zn, Fe, Cu, Pb and Cd were analysed using atomic absorption spectrophotometry (Atomic Absorption/Emission spectrometer 200-A). The results showed that lead concentrations were below detection limit in water samples whereas all the metals analysed in Macaranga hendelotic were all detected. Metals (Cu, Zn, Pb and Cd) concentration in Macaranga hendelotic in this study were within those levels obtained by scientist from Avicema Marine community in Shenzhen, China. Statistical analysis using spearman rank order correlation showed that Ca, Mg, K, Zn, Fe and Pb were not significant. Only Cd showed positive relationship whereas, Na and Cu were inversely correlated. Monthly variations of metal concentrations were recorded. The results further showed that Macaranga hendelotic is an adequate biological indicator of heavy metal in Nigerian Rivers.
Trace Elements in Sawdust Particles in the Vicinity of Sawmill in Sapele, Nigeria
G.E. Nwajei,C.M.A. Iwegbue
Pakistan Journal of Biological Sciences , 2007,
Abstract: This study report the results of determination of concentrations of lead, cadmium, chromium, barium, arsenic and mercury in sawdust particles collected in the vicinity of wood sawmill in Sapele and its environs. The mean levels of the elements observed ranged from 40-250 mg kgG1 for Pb; 0.50 mg kgG1 for Cd; 1.46-160.50 mg kgG1 for Cr; 1.50-94.0 mg kgG1 for Ba; 32.0-84.0 mg kgG1 for As and 0.50-40 mg kgG1 for Hg. The levels of these trace elements observed in the sawdust particles exceeded permissible occupational exposure limits. Sawdust particles constitute serious health risk to human and the environment in general.
Test Anxiety, Depression and Academic Performance: Assessment and Management Using Relaxation and Cognitive Restructuring Techniques  [PDF]
Esther F. Akinsola, Augustina Dubem Nwajei
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.46A1003
Abstract:

Examination as a word evokes varying degrees of anxiety in students depending on the importance of the examination, perceived difficulty level of the subject, and degree of preparedness for the examination. A perceived difficult subject would elicit higher anxiety levels, and test anxiety as a psychological condition can adversely affect people in every field of life (Cohen, 2004), and especially it adversely affects students who face different examinations. The suspicion is that test anxiety may not exist alone but co-exist with other forms of psychological distress such as depression, and psychological intervention such as cognitive therapy is expected to reduce students’ anxieties and any other psychological distress and consequently improve their academic performance. In an attempt to verify our suspicion and confirm the expectation, 420 senior secondary school students made up of 210 males and 210 females aged between 13 and 19 years responded to test anxiety, trait anxiety, and depressive symptoms inventories. 72 of the students whose test anxiety scores were higher than the group’s average score were divided into three groups and treated under three conditions of “no treatment”, “relaxation treatment alone”, and combined “relaxation and cognitive restructuring treatment”. Results obtained show that test anxiety, trait anxiety, and depression co-exist and are positively related, and they are negatively related to academic performance. In addition the combination of relaxation and cognitive restructuring treatment reduced anxiety and depression better than relaxation treatment alone or no treatment and improved test performance of the students much more than any of the other two conditions. The findings thus confirm the effectiveness and efficacy of cognitive therapy in managing anxiety and depression and improving academic performance, and when combined with relaxation

Heavy Metals in Surface Soils under Waste Dumps from Onitsha Nigeria
G.E. Nwajei,C.M.A. Iwegbue,M.I. Okafor
Journal of Biological Sciences , 2007,
Abstract: Heavy metals in surface soils under waste dumps in Onitsha metropolis was investigated from Onitsha metropolis. Seven metals, namely arsenic, barium, cadmium, chromium, manganese, lead and lithium were considered. Analytical determinations were performed by atomic absorption spectrometry after sample digestion with acid mixture. Elevated concentrations of the aforementioned metals were obtained in this study. All metals were detected except for the background, soil sample from Inland town where chromium and lead were below detection limit. There were variations in the concentrations of metals in soils from various locations. Metal concentrations in soils obtained from Omagba phase II, Woliwo layout, Fegge road, Head bridge, Odoakbu layout, Awada layout and Isiafor layout were higher than those from Ozala layout and Inland town (Background soil samples). The highest concentrations of the contaminant metals found in soil located near the head bridge of River Niger. The sources of these metals were attributed to the industrial and anthropogenic wastes in various sample locations.
A Philosophical Evaluation of the Concept of African Freedom  [PDF]
Godwin Okaneme
Open Journal of Philosophy (OJPP) , 2013, DOI: 10.4236/ojpp.2013.31A027
Abstract:

Freedom is a key concept in universal affairs. It is so important in human affairs that individuals, countries and even continents cannot do without it. The term freedom is highly subjective as its meaning may differ from one individual to another. It equally applies to countries and continents. This factor however does not in any way reduce the philosophical importance of the concept of freedom and its critical role in human affairs. This work evaluates the concept of African freedom based on Maduabuchi Dukor’s incisive work on African freedom titled “African freedom: The freedom of philosophy”. The paper takes the strong but painful position that Africa in not really free and gives reasons for this unfortunate scenario. It further discusses the way out of the continent’s quagmire.

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