Abstract
The amount iron content of the extracts and samples of Acacia species was determined. Since the iron hinders the process of retanning leather, iron content is determined by wet digestion method and atomic absorption spectrophotometry. The iron contents of bark extract of Acacia nilotica, Acacia senegal and Acacia seyal were 0.0044%, 0.0040% and 0.0029% respectively. In contrast, the iron content of bark extract of the three species of Acacia had lower percentage compared to that of Mimosa (Acacia mearnsii) (0.0047%), which was imported from Kenya. The iron content presented in leaves, barks, mature and immature fruits of Acacia species were determined by the same analytical methods. Bark and mature fruits of Acacia nilotica had the highest and equal percentage (0.1450%). The percentage of iron content of leaves and bark of Acacia seyal had equal percentage (0.0750%), while the bark of Acacia senegal had much lower percentage (0.0375%).
Highlights
The excess of Fe ions which was not absorbed appeared as spots of rust which was undesirable in the leather industry
The samples Acacia nilotica and Acacia seyal were brought from Sunt Forest at Khartoum State, whereas the Acacia senegal samples were brought from Debeybat Forest at South Kordofan State in Sudan
Comparison of the amount of iron content present in the plant part materials of Acacia species was made with the extract of different solvents of the same species, and comparison was made with the iron content present in the Mimosa (Acacia mearnsii) extract
Summary
The excess of Fe ions which was not absorbed appeared as spots of rust which was undesirable in the leather industry. The rusting of iron is the formation of hydrated oxide in the presence of oxygen and water. The rust formed on atmospheric exposure is usually more adherent than the produced by immersion. The alkali and ferrous salt, where they meet they will interact to give precipitate of yellow brown-rust consisting of hydrated ferric oxide Fe2O3∙H2O, provided that plenty of oxygen was present. All these facts have been established by direct observation. The alkali and ferrous salt can be detected by simple test, the precipitation and settlement of the rust are obvious to the eye
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