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Clay mineralogy and surface charge characteristics of basaltic soils from Western Samoa

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Naidu, R., Morrison, R.J., Janik, L. and Asghar, M. (1997) Clay mineralogy and surface charge characteristics of basaltic soils from Western Samoa. Clay Minerals, 32 (4). pp. 545-556. ISSN 0009-8558

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Article Link: https://doi.org/10.1180/claymin.1997.032.4.05

Abstract

The clay mineralogy and surface charge characteristics of four basaltic soils from Western Samoa have been studied. The soils contained subordinate to dominant amounts of poorly ordered allophanic material in addition to varying amounts of crystalline free iron oxide minerals. Infrared studies revealed the presence of trace to subordinate amounts of kaolin minerals in all the soils. The surface charge-pH curves followed a constant potential model indicating the presence of substantial amounts of pH-dependent charge. Some negative charge was present, however, at pH values as low as 3.0 and small quantities of positive charge were detected at pH values as high as 9. Values for PZC ranged from 2.2 to 3.9 and these were generally higher than the pHo determined by the ΔpH method.

Item Type:Article
Subjects:Agriculture > Agriculture (General) > Soils. Soil science
Live Archive:26 Mar 2024 05:03
Last Modified:26 Mar 2024 05:03

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