Optimization of an electrolyte conductivity detector for measuring low ion concentrations

Timmer, Björn and Sparreboom, Wouter and Olthuis, Wouter and Bergveld, Piet and Berg van den, Albert (2002) Optimization of an electrolyte conductivity detector for measuring low ion concentrations. Lab on a Chip, 2 (2). pp. 121-124. ISSN 1473-0197

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Abstract:	The optimization process of a planar interdigitated conductivity detector for measuring very low electrolyte concentrations for use in a lab-on-chip gas detection system is described. An electrical equivalent of the sensor is given, which includes the double layer capacitance dependency on the electrolyte concentration, resulting in a better description of the impedance of the sensor. The cell constant of the sensor is minimized to reduce the cell resistance in low specific conductivity solutions under the restriction of a small electrode area ( 0.1 cm2) for fast measurement, prescribed by the ammonia detection system. The small size makes it suitable for integration in micro channels. The developed sensor has a cell constant of 7.9 m–1 resulting in a maximum resistance for deionized water of 177 k at a frequency of 1 kHz.
Item Type:	Article
Copyright:	© 2002 RSC Publishing
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/43788
Official URL:	http://dx.doi.org/10.1039/b201225a
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