What is ion selective membrane?

What is ion selective membrane?

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.

What is the advantage of ion permeable membranes?

The so-called heterogeneous ion-exchange membranes have low cost and a thicker composition with higher resistance and a rough surface that can be subject to fouling. Homogeneous membranes are more expensive, but have a thinner composition with lower resistance and a smooth surface, less susceptible to fouling.

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.

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.

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 components of ion-selective electrode?

The three main components of making a measurement at an ISE are an inner reference, or standard, solution and an outer analyte, or sample, solution separated by a thin membrane.

Is glucose permeable or impermeable?

However, the bilayer is impermeable to larger polar molecules (such as glucose and amino acids) and to ions. Although ions and most polar molecules cannot diffuse across a lipid bilayer, many such molecules (such as glucose) are able to cross cell membranes.

What is bipolar membrane?

Bipolar membranes (BPMs) are a special class of ion-exchange membranes constituted by a cation- and an anion-exchange layer, allowing the generation of protons and hydroxide ions via a water dissociation mechanism.

What are ion selective electrodes give examples?

Ion-selective electrode sensors have been classified according to the membrane type and include the following electrode classifications: (1) homogeneous crystalline membrane electrodes (e.g., LaF3 for F−, Ag2S for Ag+ or S2−, AgCl/Ag2S for Cl−); (2) heterogeneous crystalline membrane electrodes (e.g., silicone rubbers …

What are the disadvantages of ion-selective electrode?

Ion-selective electrodes are one of the most frequently used potentiometric sensors during laboratory analysis. However, most of these sensors suffer from disadvantages such as narrow working concentration range, non-Nernstian potential response, high response time, high detection limit, and poor reproducibility.

What are the characteristics of ion-selective electrodes?