Detection of sodium and potassium ions in human sweat using electrochemical system

Abstract Sweat contains a large number of biomarkers which can be used to indicate the healthy state of the body. Real-time detection of ion contents in sweat at trace levels has significant implications for health monitoring and medical diagnosis. In this work, an electrochemical detection system combining an electrochemical detection circuit and an electrochemical sensor with ion selectivity was developed. Based on the system sodium and potassium ions were detected at room temperature using the open circuit voltage-time (OCPT) method. The ion-selective sensors have high sensitivity (98.3 mV/decade for sodium ion detection and 99 mV/decade for potassium ion detection), and good stability. Miniaturized detection system makes it possible to detect sweat on wearable devices and holds great promise in the wearable field.