What is selective coefficient in chemistry?

What is selective coefficient in chemistry?

Selectivity of ISEs The selectivity coefficient is a numerical measure of how well the membrane can discriminate against the interfering ion.

What are selectivity coefficients?

A selectivity coefficient is the equilibrium constant for the reaction of displacement by one ligand of another ligand in a complex with the substrate. Binding selectivity is of major importance in biochemistry and in chemical separation processes.

What does a high selectivity coefficient mean?

For reference: Definition of selectivity coefficient Higher concentrations of target ions result in the interfering ions having a smaller effect, and conversely, lower concentrations result in them having a larger effect. An ion selective electrode has its own operable pH range.

Is an example of ion selective electrode?

Glass membranes are made from an ion-exchange type of glass (silicate or chalcogenide). This type of ISE has good selectivity, but only for several single-charged cations; mainly H+, Na+, and Ag+. A very common example of this type of electrode is the pH glass electrode.

What is selectivity coefficient in ion exchange?

Ion exchange resins, when placed in a solution, reach an equilibrium state between ions in the solution and ions on the resin. These selectivity coefficients are a measurement of a resins preference for an ion. The greater the selectivity coefficient, the greater the preference for the ion.

How does fluoride ISE work?

Principle of Operation of the Fluoride ISE. In the case of the F ISE, the ion-selective membrane is a single crystal of Lanthanum Fluoride (LaF3) doped with Europium Fluoride (EuF2) which produces holes in the crystal lattice through which F ions can pass.

What does selectivity mean in chemistry?

Definition of Selectivity Selectivity refers to the extent to which a method can determine particular analytes in mixtures or matrices without interferences from other components.

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.

What are ion-selective electrodes used for?

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 3 factors affect the selectivity of ion exchangers?

The factors that affect separation during ion exchange chromatography include the surface area of the stationary phase (resin bead size); the density of exchange sites on the stationary phase surface (cross-linkage); the flow rate of the mobile phase (resin bead size and column geometry; system pressure in high- …

What is strong base anion?

Strong base anion unit is a vessel in which an ion exchange process takes place. OH¯ ions replace the anions present in TDS to produce demineralized water. The anions present in the water i.e. Cl, SO4, HCO3 and silica etc. Therefore, water becomes demineralized resulting in a solution of pure water.


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