%K 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
%X 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.
%D 2016
%R 10.1097/SS.0000000000000143
%N 2
%O cited By 5
%L scholars7213
%J Soil Science
%T Yellowing of a red south african kandiudult, studied by means of mössbauer spectroscopy
%I Lippincott Williams and Wilkins
%V 181
%A E. Van Ranst
%A E. Padmanabhan
%A R.E. Vandenberghe
%A E. De Grave
%A F. Mees
%P 75-81