At ZP we are in a continuous mode of improving our sensors. In this recent effort we have studied our potassium sensors for longer period to see the drift as a function of time.
In the adjacent experiment a ZP potassium sensors were tested at three concentrations of 0.1 mM, 1 mM and 10 mM potassium ion concentration. The sensor was tested this way in three consecutive experiments, within a 45 minute period - see adjacent image.
The sensor was taken out of solution between each experiment (trial) and in this study the sensors showed a change between each trial - see adjacent image.
We zoomed in on the data at 1 mM potassium to understand the drift on the sensors - see adjacent image.
We were able to determine that the potassium sensor showed a change in sensitivity of approximately 6 % per hour when in a constant concentration solution of potassium ions of 1 mM .
The importance of sensor drift on a potassium ion sensor (ISE) depends on the application, if you have any commercial or technical questions regarding Zimmer and Peacock's potassium ISE then please don't hesitate to contact us.