Yellowing of a red south african kandiudult, studied by means of mössbauer spectroscopy

Van Ranst, E. and Padmanabhan, E. and Vandenberghe, R.E. and De Grave, E. and Mees, F. (2016) Yellowing of a red south african kandiudult, studied by means of mössbauer spectroscopy. Soil Science, 181 (2). pp. 75-81.

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Abstract

An Acrudoxic Kandiudult soil profile from Farmhill, KwaZulu-Natal Province, South Africa, was analyzed by Mössbauer spectroscopy as an example of a red soil with yellowish surface horizons, a common sequence for which iron oxide characteristics are only poorly documented. In the red lower part of the profile (62+ cm), the Fe oxide fraction consists of hematite and well-crystallized pure goethite. In the yellowish upper part (0-62 cm), the relative hematite content is lower, goethite shows a high degree of Al-for-Fe substitution, and ferrihydrite is present. Processes found to have affected the Fe oxide fraction are hematite dissolution, partial leaching, goethite precipitation with a high degree of Al incorporation, and ferrihydrite formation in conditions with a high organic matter content; the so-called DOM (dissolved organic matter) ferrihydrites. © 2016 Wolters Kluwer Health, Inc.

Item Type: Article
Impact Factor: cited By 3
Uncontrolled Keywords: aluminum; dissolution; dissolved organic matter; ferrihydrite; hematite; iron oxide; leaching; Mossbauer spectroscopy; precipitation (chemistry); red soil; soil color; soil horizon; soil profile; soil type; tropical soil, KwaZulu-Natal; South Africa
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 25 Mar 2022 07:53
Last Modified: 25 Mar 2022 07:53
URI: http://scholars.utp.edu.my/id/eprint/31032

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