What is the principle of ion-selective electrode?

What is the principle of ion-selective electrode?

Principle of the ion-selective electrode (ISE) It produces potential that is proportional to the concentration of the tested analyte. Making measurements with ISE is a form of potentiometry. The most common ion-selective electrode is the Ph electrode.

What are some advantages of ISE?

ISE has many advantages compared to other techniques, including:

• It is relatively inexpensive and easy to operate.
• It has wide concentration measurement range.
• As it measure the activity, instead of concentration, it is particularly useful in biological/medical application.

What determines ion selectivity in an ion selective electrode system?

The selectivity of the ISE is determined by the composition of the membrane. Ideally the membrane allows the uptake of only one specific ion into it. The analyte ion may be a cation or an anion.

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 is 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.

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.

How does the laf3 electrode sense fluoride ions?

In the lanthanum fluoride electrode, the sensing element is a crystal of lanthanum fluoride (LaF3), doped with europium(II) fluoride (EuF2) to create lattice vacancies. Such a crystal is an ionic conductor by virtue of the mobility of fluoride ions which jump between lattice vacancies.

What are the various types of ion-selective electrodes?

The following are the four main types of ion-selective electrodes: Glass electrodes are made of ion-exchange type glass membranes, and possess good selectivity, particularly for Ag+, Na+ and H +. Chalcogenide glass, however, has good selectivity for double-charged metal ions such as Cd2+and Pb2+.

What are the types of electrode?

There are two types of electrodes, cathodes, and anodes. Cathode attracts the positively charged cations. Anode attracts negatively charged anions. Electrodes are commonly made of metals such as platinum and zinc.

What is direct and indirect ISE?

Direct ISE is the technique employed in blood gas and most other point-of-care analyzers whereas indirect ISE is used in the majority of biochemistry profiling analyzers sited in central laboratories.

What is ISE in clinical chemistry?

ISE means ion-selective electrodes. Indirect ISE: Measures on a total plasma sample (or serum) that has been diluted with a large volume of diluent. Requires that the plasma and erythrocytes are separated by centrifugation.

What are Ion selective electrodes types?

There are four main types of ion-selective membrane used in ion-selective electrodes (ISEs): glass, solid state, liquid based, and compound electrode.