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All Journal Journal of Mechanical Engineering Science and Technology Journal Pesona Indonesia
Nwanna, Emmanuel Chukwudi
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Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis of heavy metal concentrations of ofia-imoka river inAwka town Southeast Nigeria for domestic purposes Nwanna, Emmanuel Chukwudi; Maduegbuna, John Ikedinachukwu; Odeh, Calistus Princewill; Ekwueme, Godspower Onyekachukwu; Okadigwe, Emmanuel Igwebudu
Jurnal Pesona Indonesia Vol. 2 No. 2 (2025): JPI 2025
Publisher : Institut Teknologi Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71436/jpi.v2i2.39

Abstract

Recognizing the heavy metal attributes of water is essential when handling resources, evaluating its purity, as well as tackling environmental issues. Water is an essential part of life and a vital resource for industrial, residential, and environmental uses. Because of the possible connections to cancer and other illnesses, the presence of heavy metal poisoning in rivers poses major health hazards through ingestion and skin exposure. The river's typical usage for drinking, cooking, and other domestic tasks are restricted since it flows via a channel that may have become polluted by manufacturing, agriculture, among other human activity. The sample was gathered, and its degree of contamination by heavy metals as well as appropriateness for household use were assessed. Lead (Pb), cadmium (Cd), mercury (Hg), chromium (Cr), iron (Fe), molybdenum (Mo), manganese (Mn), arsenic (As), cobalt (Co), nickel (Ni), silver (Ag), and calcium (Ca) are among the characteristics that were examined. Atomic Absorption Spectrometer (AAS) were used to analyze the metal content in water samples and contrasted with World Health Organization (WHO) permissible limits. All of the metrics, with the exception of nickel mg/l (0.011) and mercury mg/l (0.003), were found to be below WHO permissible levels. The administration of agricultural chemical products, growth in urbanization, industrialization, mining for minerals, and natural factors such as weathering of rocks are the main causes of this contamination. As a means to tackle pollution from heavy metals and safeguard human health, the study highlights the need for ongoing surveillance and focused mitigation techniques. Given the recommended values, the Ofia-Imoka river is unfit for human consumption since the levels of nickel, and mercury exceeded what the WHO considers safe.
Multiple Input–Single Output (MISO) Framework for Low Velocity Impact Response of Hybrid Gongronema latifolium/S-Glass Fibre Epoxy Composites Okafor, Christian Emeka; Ugwu, Peter Chukwuemeka; Ekwueme, Godspower Onyekachukwu; Akçakale, Nürettin; Nwanna, Emmanuel Chukwudi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p177

Abstract

Sustainable composites are vital for impact-critical aerospace, automotive, and defense applications. This study used Multiple Input–Single Output (MISO) experimental approach to assess how hybrid ratio, mass fraction, and fiber orientation influence the low-velocity impact behavior of Gongronema/S-glass epoxy composites. Gongronema fibers and S-glass were combined with ER-F292 epoxy and molded into ASTM-standard samples. Charpy impact tests measured energy absorption. A 60-run design evaluated input variable combinations, and Multiple Linear Regression identified significant predictors using p-values and confidence intervals. Results showed that the mean values for hybridization ratio, mass fraction, fiber orientation, and low velocity impact were (2.50), (27.79%), (67.90°), and (3.82 J), respectively. It was found that the mass fraction had significant negative correlation with low velocity impact (r = -0.455; p = 0.000), as did the fiber orientation (r = -0.853; p = 0.000). The results for R = (0.994), R² = (0.989), F = (1607.390), and Durbin-Watson = (2.213) show that the regression model is highly predictive. Regression coefficients indicated negative effects from hybridization ratio (-0.357), mass fraction (-0.032), and fiber orientation (-0.017), all statistically significant (p = 0.000). Residual plots confirmed model validity. The TEM images of confirmation test sample 1 reveal fiber-matrix interfaces with particle sizes between 10.02–26.40 nm. Variations in scale (100 nm and 50 nm) show microstructural differences, suggesting strong adhesion, dispersion aggregation, and anisotropic behavior due to 90-degree fiber orientation within epoxy matrix. The study concludes that strategic optimization of input parameters significantly enhances the impact resistance of hybrid biocomposites.
Co-Authors Akçakale, Nürettin Ekwueme, Godspower Onyekachukwu Maduegbuna, John Ikedinachukwu Odeh, Calistus Princewill Okadigwe, Emmanuel Igwebudu Okafor, Christian Emeka Ugwu, Peter Chukwuemeka