Effect of acetate on ferrihydrite crystallization |
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| Authors: | Maria do Carmo Rangel Varela Milton Francisco de Jesus Filho Fernando Galembeck |
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| Affiliation: | (1) Instituto de Química, Universidade Federal da Bahia, 40210 Salvador, Ba., Brazil;(2) Departamento de Química, Universidade Federal de Minas Gerais, 31270 Belo Horizonte, MG, Brazil;(3) Instituto de Química, Universidade Estadual de Campinas, CP 6154, 13081 Campinas, SP, Brazil |
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| Abstract: | Mössbauer spectroscopy was used to follow the aging of ferrihydrite with different amounts of acetate, to achieve more crystalline products. Mössbauer spectra of fresh samples did not show any magnetic components. After two years aging, the solids presented crystalline fractions. Hematite formation was inhibited as acetate content increased in solids. For an acetate/iron molar ratio equal to 0.63 goethite was formed instead of hematite. X-ray diffraction confirmed these results. This work shows that synthetic samples can be used for elucidating the  anti-hematitic effect of organic matter already detected in soils. |
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