Contents
What does ion-selective electrode measures?
An ion selective electrode generates a difference in electrical potential between itself and a reference electrode. The output potential is proportional to the amount or concentration of the selected ion in solution. The concentration is a measure of the number of ions in a specific volume.
What are the application of ion-selective electrode?
Ion-selective electrodes (ISEs) are very similar in use to pH electrodes. They are used for chloride, potassium, calcium, carbon dioxide/carbonate, oxygen, and a variety of other ions. These methods are particularly suited for field analysis and online measurements.
What are the characteristics of ion selective electrodes?
Explanation: Ion selective electrodes have a wide concentration range. It is highly selective to a particular ion. 8. Ion selective electrode are unaffected by colour or turbidity of the solution.
What type of reaction takes place in ion selective electrodes?
An ion-selective electrode (ISE), also known as a specific ion electrode (SIE), is a transducer (or sensor) that converts the activity of a specific ion dissolved in a solution into an electrical potential. The voltage is theoretically dependent on the logarithm of the ionic activity, according to the Nernst equation.
Why glass electrode is called an ion-selective electrode?
Glass electrodes are ion-selective electrodes based on the chemical properties of a glass membrane of defined chemical composition. Conduction within the dry glass is due to the cation of lowest charge and is not related to penetration by a substantial amount of cations. FIGURE 16.
Can ion selective electrodes be used for pH measurements?
The most well-known and highly used ion-selective electrode is a pH electrode, which is sensitive toward the H+ ion. A desirable aspect of ion selective electrodes is their ease of use. Using pH electrodes as an example, after appropriate calibration, it is quite trivial to measure the pH of a solution.
What is Nernstian response?
Nernstian response : An electrode is said to have a Nernstian response over a given concentration range if a plot of the potential difference (when measured against a reference electrode) versus the logarithm of the ionic activity of a given species in the test solution, is linear with a slope factor which is given by …
Which of the following is the limitation of an ion selective electrode?
The three main limitations on Ion Selective Electrode measurements are the effect of interference from other ions in solution, the effect of the ionic strength of the solution reducing the measured activity relative to the true concentration at high concentrations, and potential drift during a sequence of measurements.
Why glass electrode is called an ion selective electrode?
Why glass electrode is not suitable for high pH?
Acidic error range – at very high concentration of hydrogen ions (low values of pH) the dependence of the electrode on pH becomes non-linear and the influence of the anions in the solution also becomes noticeable. These effects usually become noticeable at pH < -1.
What are the differences between pH electrode and ion selective electrode?
Whereas the traditional pH electrode measures the potential of dissolved hydrogen ions; ISE can measure the potential of the ions many substances; some common examples are Ammonia, Cadmium, Calcium, Bromide, Fluoride, Copper and Cyanide dissolved in a solution.