TY - JOUR KW - 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 KW - KwaZulu-Natal; South Africa ID - scholars7213 IS - 2 N2 - 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. VL - 181 UR - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959135815&doi=10.1097%2fSS.0000000000000143&partnerID=40&md5=dbd1e2c815bc8e90df2e4527e33a9edd A1 - Van Ranst, E. A1 - Padmanabhan, E. A1 - Vandenberghe, R.E. A1 - De Grave, E. A1 - Mees, F. JF - Soil Science Y1 - 2016/// SP - 75 TI - Yellowing of a red south african kandiudult, studied by means of mössbauer spectroscopy N1 - cited By 5 AV - none EP - 81 SN - 0038075X PB - Lippincott Williams and Wilkins ER -