Rhodes, Edward R.2026-10-191978-09-01Rhodes, E. R., & Lindsay, W. L. (1978). SOLUBILITY OF ALUMINIUM IN SOILS OF THE HUMID TROPICS. Journal of Soil Science, 29(3), 324–330. https://doi.org/10.1111/j.1365-2389.1978.tb00780.x10.1111/j.1365-2389.1978.tb00780.xhttps://doi.org/10.1111/j.1365-2389.1978.tb00780.xhttps://dspace.njala.edu.sl/handle/20.500.144402/1582Summary Soil samples obtained from genetic horizons of an upland and acid sulphate soil of Sierra Leone, were equilibrated with 0.01 M CaCI using a 1:2 soil to solution ratio. Al 3+ activity was estimated from total Al measured in the equilibrium extract, by accounting for hydrolysis and the formation of other complex species. The Al 3+ activity was pH‐dependent, but the Al(OH) 3 ion product was I'airly constant throughout the upland soil profile; Al 3+ activity was near that expected for equilibrium with kaolinite and quartz. In the acid sulphate soil alunite appeared to control the activity of Al 3+ .enMetadata only. Full text is not deposited in this repository; it is available from the publisher: https://doi.org/10.1111/j.1365-2389.1978.tb00780.xaluminum solubilityArticle