A dipstick sensor for coulometric acid-base titrations

Olthuis, W. and Schoot van der, B.H. and Chavez, F. and Bergveld, P. (1989) A dipstick sensor for coulometric acid-base titrations. Sensors and Actuators, 17 (1-2). pp. 279-283. ISSN 0250-6874

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Abstract:	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.
Item Type:	Article
Copyright:	© 1989 Elsevier
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/70585
Official URL:	http://dx.doi.org/10.1016/0250-6874(89)80092-7
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