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The Use of Zero Point of Charge (ZPC) to Assess Pedogenic Development¹

ABSTRACT

The pH at the zero point of charge (ZPC) has been used to characterize the electrochemical properties of soils. To date, most studies have focussed on soils high in oxides with low phyllosilicate content. The study reported here attempts to use ZPC determinations to characterize the surface charge characteristics of soils from a temperate region. Three soils were examined; these ranged in pedogenic development, as expressed by soil morphology, from a small accumulation of sesquioxides to a relatively high one. The soils were a Dystric Eutrochrept, a Typic Ferrudalf, and a Spodic Ferrudalf. With increased pedogenic development the ZPC became more clearly defined and approached the natural pH of the soil, and there was a decrease in the relative significance of the pH-independent charge. The ZPC may be used as a measure of pedogenic development.

¹ Contribution from the Dep. of Soil Science, Univ. of British Columbia, Vancouver, B.C.

² Graduate student and Professor, Dep. of Soil Science, Univ. of British Columbia, Vancouver, B. C. V6T 1W5.

Received for publication October 3, 1977. Accepted for publication January 17, 1978.

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