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All Journal Journal of Education and Teacher Training Innovation (JETTI) Humanities Horizon Journal ASEAN Journal for Science and Engineering in Materials
Onwudinjo, Felicity Uju
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Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Hard and Soft Acids and Bases (HSAB): Investigating Adduct Formation in Non-Aqueous Solvent Media with Selected Divalent Class B Metal Ions in Chemistry Onwudinjo, Felicity Uju
ASEAN Journal for Science and Engineering in Materials Vol 3, No 2 (2024): AJSEM: Volume 3, Issue 2, September 2024
Publisher : Bumi Publikasi Nusantara

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Abstract

This study explores the Lewis acid/base interactions of divalent metal ions—copper (II), lead (II), and mercury (II)—with Lewis bases 2-naphthol and caffeine in an ethanol solvent. Utilizing the method of continuous variation, absorbance data were analyzed to understand these interactions. Absorbance data analyzed through Job's plot revealed distinct interaction patterns. For the copper (II) system, the Job's plot did not exhibit a maximum, indicating a lack of significant cooperative interaction, with absorbance values fluctuating without a clear pattern. In contrast, the lead (II) and mercury (II) systems demonstrated clear maxima with both 2-naphthol and caffeine, evidencing cooperative interactions. Specifically, the Job plot for lead (II) with 2-naphthol peaked at an absorbance of 1.25 at a mole ratio of 1:1, and for mercury (II) with caffeine, a maximum absorbance of 1.40 was observed at the same stoichiometry. These results indicate a 1:1 stoichiometry for the adducts formed, suggesting that the interactions of these metal ions with the bases can be described by the Eigen-Wilkins mechanism. This mechanism may thus account for the adduct formation involving the class B Lewis acids studied in a non-aqueous medium, highlighting a distinctive aspect of their chemical behavior. 
Assessment of Chemistry Teachers’ Knowledge on Entrepreneurial Chemistry Topics in Senior Secondary Schools Onwudinjo, Felicity Uju
Journal of Education and Teacher Training Innovation Vol. 2 No. 2 (2024): Journal of Education and Teacher Training Innovation (JETTI)
Publisher : PT. Pusmedia Group Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61227/jetti.v2i2.119

Abstract

The study investigated the entrepreneurship knowledge of chemistry teachers in Otuocha education zone of Anambra state, towards some topics in senior secondary school chemistry curriculum. Three research questions guided the study. 31 chemistry teachers from Otuocha education zone were involved. Twenty-four item questionnaire generated from five branches of chemistry mainly taught in senior secondary schools were used for data collection. The instrument was validated and its reliability was found to be 0.91 using Cronbach alpha. The data analysed using mean and standard deviation indicated that twelve (12) out of the twenty three topics were found not to be significant on teachers’ knowledge of entrepreneurship in teaching. This is an indication that students are not being cultured with these skills during lesson. This was also confirmed in the analysis of the data collected from how teachers relate the topics to real world / entrepreneurial skill, where sixteen (16) out of twenty three topics were found not to be significant on teachers’ in relating to entrepreneurship in teaching. Out of the fifteen (15) entrepreneurial teaching strategies tested, twelve were found not to be significant on teachers’. Some recommendations were made based on the findings to improve the development of entrepreneurial skills in students.
Analysis of selected heavy metals (Fe, Pb, Cu, Cr) in surface water and sediments in Okulu River in Eleme Local Government Area of Rivers State Nigeria Ifiora, Chukwudozie Colman; Woke, G. N.; Onwudinjo, Felicity Uju; Ekeke, Chimezie; Iringe-Koko, T. M.; Osaro, Paul Aforji
Humanities Horizon Vol. 3 No. 1 (2026)
Publisher : PT. Pena Produktif Kreatif

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63373/3047-8014/49

Abstract

Industrial activities along riverine environments in the Niger Delta have raised serious concerns about heavy metal contamination of surface water and sediments, with potential implications for ecosystem integrity and public health. The Okulu River in Eleme Local Government Area, Rivers State, is increasingly exposed to industrial effluents, making it necessary to assess its environmental quality. The study employed an environmental analytical research design to assess heavy metal concentrations in surface water and sediments of the Okulu River in Eleme Local Government Area, Rivers State, Nigeria. Five sampling points, including four industrially impacted sites and one control, were analyzed. Surface water and sediment samples were collected, digested using mixed acids, and analyzed for Fe, Pb, Cu and Cr using Atomic Absorption Spectrophotometry. Results were statistically analyzed and compared with World Health Organization standards to evaluate contamination levels and potential environmental and health risks. The results revealed spatial variations in heavy metal concentrations in surface water and sediments of the Okulu River. Iron levels in surface water (1.401–10.46 mg/L) and sediments (1.4565–10.581 mg/L) were below the WHO limit (20 mg/L). Lead concentrations in surface water (0.029–14.91 mg/L) exceeded the WHO limit (0.01 mg/L), indicating contamination, while sediment lead levels (0.0359–36.233 mg/L) remained within the permissible limit (400 mg/L). Copper concentrations in surface water (0.002–3.814 mg/L) and sediments (0.3432–18.754 mg/L) were below WHO limits (35 mg/L). Chromium showed elevated levels in surface water (0.397–24.09 mg/L) and sediments (0.01523–15.1506 mg/L), exceeding WHO limits (0.003 mg/L). The study concludes that while some metals pose minimal risk, elevated lead and chromium levels preasent potential environmental and health concerns, underscoring the need for continuous monitoring and effective regulation of industrial discharges into the Okulu River.
Evaluating quality of water bodies in rural communities in the Southeastern Nigeria and Implications to health of the citizen Onwudinjo, Felicity Uju; Okongwu, Dozie John
Humanities Horizon Vol. 3 No. 1 (2026)
Publisher : PT. Pena Produktif Kreatif

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63373/3047-8014/50

Abstract

Access to safe drinking water remains a major public health challenge in rural communities of South-Eastern Nigeria. This study evaluated the quality of water bodies in selected rural areas of Ebonyi, Anambra, and Abia States, assessing contaminant types, concentrations, and potential health implications for residents. A cross-sectional, seasonal field-based approach was adopted, with ninety water samples collected from nine springs during both the dry and rainy seasons. Physicochemical, microbial, and heavy metal parameters including pH, turbidity, total dissolved solids, iron, lead, total coliform, and Escherichia coli were analyzed using standard APHA methods. Statistical analyses, including multiple regression, principal component analysis, and cluster analysis, revealed that microbial contamination (total coliform and E. coli) and physical-chemical factors (turbidity, iron, total dissolved solids) were the dominant contributors to water quality degradation. Significant correlations indicated that lower pH and elevated turbidity and total coliform levels exacerbate contamination, while cluster analysis highlighted spatial heterogeneity and high-risk locations requiring urgent intervention. The findings underscore the serious health risks posed by drinking water in these communities and point to the need for effective monitoring, pollution mitigation, and community-based water treatment strategies to reduce disease burden.
Co-Authors Ekeke, Chimezie Ifiora, Chukwudozie Colman Iringe-Koko, T. M. Okongwu, Dozie John Osaro, Paul Aforji Woke, G. N.