A dipstick sensor for coulometric acid-base titrations

Wouter Olthuis, B.H. van der Schoot, F. Chavez, P. Bergveld

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    39 Citations (Scopus)
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    By performing an acid-base titration by coulometric generation of OH− or H+ ions at an inert electrode in close proximity to the pH-sensitive gate of an ISFET, it is possible to determine the acid or base concentration of a solution using the ISFET as an indicator device for the equivalence point in the titration curve. Typical values for the titration time are 0.1 to 10 s for acid or base concentrations ranging from 0.5 × 10−3 to 10 × 10−3 mol/l. By placing the counter electrode for the supplied current on the backside of a small piece of printed-circuit board on which the sensor-actuator is attached, we obtain a dipstick-like structure.
    Original languageEnglish
    Pages (from-to)279-283
    JournalSensors and actuators
    Issue number1-2
    Publication statusPublished - 1989


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