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On-the-Go Mapping of Soil pH Using Antimony Electrodes

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2008 Providence, Rhode Island, June 29 – July 2, 2008  083995.(doi:10.13031/2013.24748)
Authors:   Viacheslav I Adamchuk, Eric D Lund
Keywords:   Soil pH; on-the-go sensing; antimony; ion-selective electrode

Glass-membrane ion-selective electrodes represent the most common measurement means to determine the pH of an aquatic media. Automated engagement of such electrodes with naturally moist soil samples allows implementation of on-the-go mapping of soil pH. However, some early adopters of this technology reported heavy electrode abuse and occasional breakage in soils with course texture and/or hard impurities. Antimony electrodes provide an alternative suitable for on-the-go mapping of soil pH. This paper illustrates the results of laboratory and field experiments comparing soil pH measurements obtained using glass-based and antimony-based ion-selective electrodes. It was concluded that measurements produced using an antimony electrode were of similar quality to the measurements done with a conventional glass electrode. However, the ability to withstand abrasion was much higher when soil was engaged with an antimony electrode than with a glass membrane.

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