Mastering Potentiometric Sensors and Ion-Selective Electrodes

Potentiometric sensors are ion-selective electrodes that measure the potential difference between two electrodes under conditions without current flow.

The principle of ion-selective electrodes involves the measurement of potential difference between two electrodes.

The activity of an ion is related to its concentration by the activity coefficient, $\gamma$, such that $a_i = \gamma [ion]$. The activity coefficient can be calculated from the Debye-Huckel theory.

<p>The Debye-Huckel equation estimates the effects of interaction between ions in a solution. It is given as follows: $y = ...$</p> Signup and view all the answers

<p>The slope of a calibration graph is Nernstian if it is equal to 59.1/z mV, where z is the charge of the ion. If the slope is below this level, it is termed sub-Nernstian, and if it is greater, it is called hyper-Nernstian. Improved performance may be achieved through conditioning the electrode in a solution of the ion of interest for 1-2 hours.</p> Signup and view all the answers