Okeniyi, Joshua Olusegun and Okeniyi, Elizabeth Toyin and Ogunlana, Olubanke Olujoke and Owoeye, Taiwo Felicia and Ogunlana, Oluseyi Ebenezer (2017) Investigating Biochemical Constituents of Cymbopogon citratus Leaf: Prospects on Total Corrosion of Concrete Steel-Reinforcement in Acidic-Sulphate Medium. In: TMS 2017 146th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series (1). Springer International Publishing, Springer, Cham, pp. 341-351. ISBN 978-3-319-51492-5
Full text not available from this repository.Abstract
In this paper, the biochemical constituents of Cymbopogon citratus leaf were investigated by atomic absorption spectroscopy (AAS), Fourier transform infrared spectroscopy (FT-IR) and phytochemical screening analyses for assessing its steel-rebar corrosion-protection prospects. AAS results showed that the leaf contained Fe = 4,641.025 μg/g, Mn = 849.5069 μg/g, Cu = 171.045 μg/g, Pb = 13.2938 μg/g, Ni = 11.5187 μg/g, Cd = 4.9310 μg/g, but Cr = 0.0 μg/g. FT-IR indicates the leaf-extract contained S-, N-, O-containing heteroatoms and aromatic compounds, which are rich in π-electrons and that are known to inhibit steel-rebar corrosion. Phytochemical screening results showed that Cymbopogon citratus leaf-extract contains tannins, phlobatannins, saponins, glycosides, flavonoids, steroids and terpenoids. Macrocell corrosion tests, as per ASTM G109-99a, showed that the plant reduced total corrosion in 0.5 M H2SO4-immersed steel-reinforced concrete samples. These indicated positive prospects of Cymbopogon citratus as an eco-friendly inhibitor of steel-reinforcement corrosion in concretes designed for acidic sulphate service-environment.
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