
%0 Journal Article
%A Menzies, NW 
%A Bell, LC 
%A Edwards, DG 
%T Exchange and solution phase chemistry of acid, highly weathered soils .I. Investigation of mechanisms controlling Al release into solution
%J Soil Research
%D 1994/04/01
%V 32
%N 2
%P 269-283
%K Soil Solution;Aluminum Solubility;Gibbsite;Jurbanite;
%R https://doi.org/10.1071/SR9940269
%U https://www.publish.csiro.au/paper/SR9940269 
%X Soil solid phase and soil solution characteristics were evaluated on surface and subsoil horizons of 60 acid, highly weathered soils in the unamended state, and on a subset of 39 surface horizons following the addition of CaSO4.2H2O. The activity of Al3+ Was found to be strongly correlated with the soil solution pH, with Al3+ activity increasing as pH decreased. For surface soils in the unamended state, and for the majority of subsoils, the Al3+ activity calculated was comparable to the theoretical activity supported by the dissolution of gibbsite (Al2O3.3H2O). The Al3+ activity in CaSO4.2H2O-amended samples tended to fall below that maintained by gibbsite dissolution and was more closely correlated with the Al3+ activity supported by the dissolution of jurbanite (AlSO4 (OH).5H2O). 
