Development of a miniature pH glass electrode with field-effect-transistor amplifier for biomedical applications

B. K. Ahn, C. C. Liu, A. O. Wist, W. H. Ko

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A miniature pH glass electrode for possible clinical and biomedical applications was constructed and evaluated in reference pH buffer solutions at 36°C. A field-effect-transistor (f.e.t.) amplifier was integrated into the system, and its effectiveness was investigated. The average e.m.f. efficiency of the developed electrode was 0·87±0·11V, and a minimum length of 7 mm was required for a good pH response. Temperature dependence of the electrode was -1·51 mV/oK at a pH of 7. Evaluation of the stability of the electrode showed a 1% drift over a 7 h operational time. The pH and temperature hysteresis effects showed 0·5% and 1·0% deviations, respectively. The response time was within 4 s for 99% response. These electrode characteristics were also investigated in blood plasma and discussed.

Original languageEnglish
Pages (from-to)450-456
Number of pages7
JournalMedical & Biological Engineering
Volume13
Issue number3
DOIs
StatePublished - May 1975

Keywords

  • Miniature pH glass electrode f.e.t. amplitier

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