Estimated Iron (Fe) Percentage in Weathered and Ferruginized Ajali Sandstone in Western Anambra Basin, Nigeria

Publication Date : 23/05/2022


Author(s) :

Akpofure, E., Debekeme, E.S..


Volume/Issue :
Volume 58
,
Issue 1
(05 - 2022)



Abstract :

A total of Ten (10) samples from Ajali Sandstone in Ayogwiri, in Etsako West Local Government Area of Edo State, Nigeria, were collected: five representing fresh Sandstone and five representing ferruginized, weathered section of the Sandstones. They were taken to the laboratory for quantitative determination of some chemical elements: Fe, Cu, Mg, Na and Mn, in order to quantify the Fe percentage, using Atomic absorption spectroscopy (AAS). The result shows that the percentage of iron ranges from 18.4% – 32.2% with an average of 26.34% in the ferruginized sandstone - Ironstone, whereas, the percentage of iron ranges from 0.19% - 2-81% with an average of 1.61% in the fresh sandstone samples. There is also, a slight increase in the concentration of Manganese (Mn) in the Ironstone but no much noticeable difference in the concentration of Cu, Mg, and Na in both fresh sandstone samples and ironstone samples. The increase of Fe percentage in the Ironstone results from weathering, leaching and accumulation of released elements from the top layer of the Sandstone to a lower level and the hardening of the sesquioxide - rich materials and secondary minerals. The result indicates the viability of the "Ajali Ironstone" with an average Fe percentage of about 26.34% for the smelting of Fe at both small and large scale as the weathered zone is pervasive


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