Release of iron oxide in red‐brown soil formation from the weathering of limestone. 1.—Effect of carbonic acid

• Published in: Journal of the Science of Food and Agriculture
• Main Author: Khan, D. H.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1959
• Subjects: Carbonic acid
• Online Access: http://dx.doi.org/10.1002/jsfa.2740100906; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjsfa.2740100906; https://onlinelibrary.wiley.com/doi/pdf/10.1002/jsfa.2740100906

Abstract In carbonic acid leaching under laboratory conditions, which were considered to be almost identical with rainwater leaching of limestone rocks, it is shown that there is a gradual release of Fe (and Si, Al, Ti, etc.) along with the bulk removal of the alkaline earth carbonates. The resultant product is a reddish‐brown to greyish‐brown residue, and perhaps represents an intermediate stage between the initial rock and the final red‐brown soil. A similar observation may also be made from the acetate‐buffer leaching of limestone rocks.