What is the principle of ion selective electrodes?
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.
Who discovered ion selective electrode?
In 1967, Ross described the first membrane electrode based on a liquid ion exchanger [2] and Bloch and co-workers introduced the first ionophore-based solvent polymeric membrane based on PVC [3], a matrix still widely used today.
What are the characteristics of ion selective electrodes?
Explanation: Ion selective electrodes have 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 are the uses 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.
Is glass electrode ion-selective electrode?
Glass electrodes are ion-selective electrodes based on the chemical properties of a glass membrane of defined chemical composition.
Which is the most widely used ion-selective electrode for pH measurement?
The most commonly used reference is a silver/silver chloride electrode in a buffer.
Which of these is not ion-selective electrode?
Clarification: Thermistors are used in calorimetric biosensor to measure the heat generated during the reaction. Hence it is not an ion-selective electrode. Glass electrodes, glass pH electrodes and solid-state electrodes are types ion-selective electrodes that are used in the potentiometric biosensor. 5.
Is ion-selective electrode accurate?
Ion selective electrodes (ISEs) can provide very accurate results, but care must be taken when using an ISE, as accurate results are dependent on proper calibration and use.
Which of the following is ion-selective electrode?
Glass membranes Chalcogenide glass also has selectivity for double-charged metal ions, such as Pb2+, and Cd2+. The glass membrane has excellent chemical durability and can work in very aggressive media. A very common example of this type of electrode is the pH glass electrode.
What is the most common ion-selective electrode?
Ion-exchange resin membranes Ion-exchange resins are based on special organic polymer membranes which contain a specific ion-exchange substance (resin). This is the most widespread type of ion-specific electrode. An example is the potassium selective electrode, based on valinomycin as an ion-exchange agent.
What does ion selective electrode mean?
An ion-selective electrode, also known as a specific ion electrode, is a transducer that converts the activity of a specific ion dissolved in a solution into an electrical potential, which can be measured by a voltmeter or pH meter. The voltage is theoretically dependent on the logarithm of the ionic activity, according to the Nernst equation.
What is an electrode that has a positive charge?
(ăn′ōd′) 1. The positive electrode in an electrolytic cell, toward which negatively charged particles are attracted. The anode has a positive charge because it is connected to the positively charged end of an external power supply.
What is selective electrode?
Ion Selective Electrode Theory. An Ion selective electrode is a sensor which converts the activity of a specific ion (dissolved in a solution) into a voltage (potential), which can be measured by a mV or Ion meter. The voltage is theoretically dependent on the logarithm of the ion activity, as described by the Nernst Equation .
How does the fluoride ion selective electrode work?
Fluoride solutions produce a potential in the lanthanum fluoride crystal and are used in varying concentrations, Fluoride Ion Selective Electrode is a sensor or a transducer. One end of the electrode is brought into contact with the sample while the other end connects to the referencing solution.
