What is Ion Selective Electrode and explain its working?
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.
What is the principle of ion selective electrode?
Principle of ion-selective electrode (I.S.E.) consists of a thin membrane across which only the intended ion can be transported. The transport of ions from a high conc. to a low one through a selective binding with some sites within the membrane creates a potential difference.
Which of the following is a disadvantage of ion-selective electrodes *?
Explanation: In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to sodium ions. Glass electrodes can be used to measure various ions by changing the glass membrane composition.
Which electrode is Ion Selective Electrode?
An electrochemical cell for making a potentiometric measurement with a membrane electrode (also known as an ion-selective electrode, ISE) is shown in Figure 1. As you can see the main difference between an ISE and the direct indicator electrode is in the ISE’s composition….Problems.
| [Pb2+] (mol/L) | E (mV) |
|---|---|
| ? | 145 |
Why are ion selective electrodes important?
Ion selective electrode (ISE) is an analytical technique used to determine the activity of ions in aqueous solution by measuring the electrical potential. It is a real-time measurement, which means it can monitor the change of activity of ion with time. It can determine both positively and negatively charged ions.
Which is Ion Selective Electrode?
Ion-selective electrodes (ISEs) are electrochemical ion sensors that convert the activity of a target ion into an electrical potential as the measurable signal.
Is glass electrode and ion-selective electrode?
A glass electrode is a type of ion-selective electrode made of a doped glass membrane that is sensitive to a specific ion. The most common application of ion-selective glass electrodes is for the measurement of pH.
How do you make an ion-selective electrode?
Ion Exchange Process Ion-exchange process. In order to construct an ion-selective electrode, we would add an inner reference solution to the other side of the membrane. This solution would contain a fixed concentration of the ion of interest, Li+ in this example.
What are the applications of ion selective electrodes?
APPLICATION:-• Ion-selective electrodes are used in a wide variety of applications for determining the concentrations of various ions in aqueous solutions. The following is a list of some of the main areas in which ISEs have been used.• Pollution Monitoring: CN, F, S, Cl, NO3 etc., in effluents, and natural waters.•
Can a ion selective electrode be fouled by a protein?
Electrodes can be fouled by proteins or other organic solutes.• Interference by other ions.• Electrodes are fragile and have limited shelf life.• Electrodes respond to the activity of uncomplexed ion. So ligands must be absent. 7 ref:-http://www.sfu.ca/chemistry/groups/Li/chem215/selective.PDF 8.
Which is the best description of a solid state electrode?
SOLID STATE ELECTRODE • Solid state electrode are selective primarily to anions. • It may be a homogenous membrane electrode or heterogeneous membrane electrode. • Homogenous membrane electrode: ion-selective electrodes in which the membrane is a crystalline material (AgI/Ag2S).
How are glass electrodes sensitive to univalent cations?
GLASS MEMBRANE ELECTRODE • Glass electrode are responsive to univalent cations ( H+ , Na+) • The selectivity for this cation by varying the composition of a thin ion sensitive glass membrane.