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Surface Charge Characteristics of Podzolized Soil

Inst. of Soil Science and Photosynthesis, Pushchino, Moscow Region 142292, Russia

Jon Chorover and Garrison Sposito^*

Dep. of Environmental Science, Policy and Management, Division of Ecosystem Sciences, Univ. of California, Berkeley, CA 94720-3110

*Corresponding author.

ABSTRACT

Recently developed methods for the accurate measurement of surface charge components and the points of zero charge in soils containing both permanent- and variable-charge constituents were applied to a Haplorthod that is typical of podzolized soils in North America, Scandinavia, and Russia. Independently measured values of the density of structural surface charge, net proton charge, and net adsorbed ion charge were obtained for soil samples from the E2 and Bhs horizons suspended in LiCl or Li₂SO₄ solutions of ionic strength 1 or 10 mmol kg^–1. Data taken across the pH range 2 to 6 tested successfully for conformity to the law of surface charge balance. Relationships between the point of zero net proton charge and the point of zero net charge were consistent with the fact that, at any pH, increasing ionic strength favored an increase in the net adsorbed ion charge, whereas changing from Cl^– to SO^2–₄ favored a decrease in the net adsorbed ion charge. The methodology and charge balance analysis are applicable to any podzolized soil.

This research was supported in part by a grant from the National Academy of Science Individual Exchange Program with the former Soviet Union and in part by National Science Foundation Grant no. EAR-9221258. Gratitude is expressed to Professor Ronald Amundson for the samples of the Becket soil and to Terri DeLuca for her excellent typing of the manuscript.

Received for publication April 8, 1994.