Measuring ionic concentrations in sweat

using cyclic voltammetry

Master thesis (2022)

Authors

T.S. Kolukisaoğlu Electrical Engineering, Mathematics and Computer Science

Contributors

A. Bossche Electronic Instrumentation - EEMCS (supervisor 1)
T.M. Lopes Marta da Costa Bio-Electronics - EEMCS (coach)
P.J. French Bio-Electronics - EEMCS (supervisor 2)
A.S.M. Steijlen (supervisor 2)
J. Bastemeijer Electronic Instrumentation - EEMCS (supervisor 2)
Faculty
Electrical Engineering, Mathematics and Computer Science
Copyright: © 2022 Tom Kolukisaoğlu
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Published Date

22-08-2022

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

This report presents a proof-of-concept for a sensor measuring the ionic concentrations in sweat using cyclic voltammetry. Development is focused on feasibility of the sensor. Theoretical evaluations of voltammetry as a working principle and its physical and electrochemical foundations are guiding principles of the design. The sensor is then implemented using commercial components. Experiments show that the sensor has good sensitivity and linearity for single ions in the physiological range. For the measurement of multiple ions the voltammogram is characterized in-depth. A matrix of different ionic fluids with multiple ions is prepared and two independent parameters for the concentration of two ions (sodium and potassium) are found, proving the concept of the sensor for more complex solutions. The usability of the sensor is verified using a sweat sample. Different influencing factors are researched and their impact characterized. Varying electrode materials are evaluated considering durability and sensitivity. Conclusions are drawn and an outlook for future research on this type of sensor is given. The concept of the sensor is proven to work within certain limitations.