How does an ion selective electrode work?

Ion selective electrodes allow us to measure the activity of a specific ion in a sample, by measuring the potential of a measuring cell which has a membrane that is specific to a certain ion, against the potential of a reference cell.

How does fluoride ion-selective electrode work?

The ion-selective electrode (ISE) typically consists of an inner reference electrode plus a membrane that provides the interface between the sample solution and the ISE. A potential develops across the membrane that depends on the difference in the activity of a specific ion on each side of the membrane.

What are the disadvantages of 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.

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 advantages of using 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 is ion-selective electrode explain construction and working of glass electrode?

ION-SELECTIVE ELECTRODES | Glass Glass electrodes sensitive to hydrogen ions are the most commonly used sensors in chemistry and related disciplines. They belong to the group of potentiometric membrane sensors and are constructed in various configurations, depending on the application.

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 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 are the benefits of using ISE?

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How does ISE work chemistry?

Principle of ion-selective electrode (I.S.E.) An ideal 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 invented ion-selective electrode?

PVC represents poly(vinyl chloride). Ion-selective electrodes have a history of over one century, noting that the best and most widely utilized ISE based on the glass pH electrode was invented in 1906 by Cremer, and that the pH electrode was quickly adapted as a routine analytical tool by the 1930s.