Chapter 4: Dissolution of kaolinite, illite and montmorillonite 105 4 Dissolution kinetics of kaolinite, illite and montmorillonite under acid-sulfate conditions: a comparative study 1 ABSTRACT Soils and sediments containing high levels of reduced inorganic sulfur pose a great risk to the environment due to their potential to produce large acidity (H 2 SO 4 ). Large quantities of reduced inorganic sulfur have accumulated in inland wetland sediments from an input of saline and sulfate rich water and long periods of submerged conditions in inland wetlands in Australia. The exposure of these sulfidic materials to atmosphere results in highly acidic and saline conditions in soils. Phyllosilicate dissolution is the major acidity neutralisation process in inland wetland soils with a little or no carbonate mineral content. The acid neutralisation capacity of phyllosilicates is dependent on the dissolution rates of these minerals. In previous studies, phyllosilicate dissolution has been investigated in acidic conditions (HCl, HNO 3 and HClO 4 ); however, the rates obtained from these studies cannot be directly applicable to acid sulfate soils (ASS) with sulfate-based acidity. Additionally, high levels of salinity often prevailing in inland ASS may have effect on the dissolution behaviour of phyllosilicates. This study was aimed at determining the dissolution rates of kaolinite and montmorillonite in NaCl solution (I = 0.01 M and 0.25 M) acidified with H 2 SO 4 (pH range of 1 to 4.25). The solution 1 This chapter has been prepared for submission to Clay Minerals, under the title ‘A comparative study of the dissolution kinetics of kaolinite, illite and montmorillonite under acid-sulfate conditions’. Authors are Irshad Bibi, Balwant Singh and Ewen Silvester.
Dissolution kinetics of kaolinite, illite and montmorillonite under acid-sulfate conditions: a comparative study
May 28, 2023
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