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ERIC Number: EJ920492
Record Type: Journal
Publication Date: 2010-Nov
Pages: 3
Abstractor: As Provided
Reference Count: 13
ISSN: ISSN-0021-9584
Inexpensive and Disposable pH Electrodes
Goldcamp, Michael J.; Conklin, Alfred; Nelson, Kimberly; Marchetti, Jessica; Brashear, Ryan; Epure, Emily
Journal of Chemical Education, v87 n11 p1262-1264 Nov 2010
Inexpensive electrodes for the measurement of pH have been constructed using the ionophore tribenzylamine for sensing H[superscript +] concentrations. Both traditional liquid-membrane electrodes and coated-wire electrodes have been constructed and studied, and both exhibit linear, nearly Nernstian responses to changes in pH. Measurements of pH from these electrodes are accurate when compared to values obtained from simultaneous measurements using commercially available pH electrodes. The electrodes function well between pH values of 3 and 10. These electrodes are typically functional for two or more months before performance begins to degrade. Performing measurements in samples with abrasive solids, such as soils, also limits the working lifetimes of the electrodes. Students have successfully constructed these electrodes and used them in the measurement of soil pH levels. (Contains 3 figures.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: High Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A