What is selectivity coefficient in ion-selective electrode?
The selectivity coefficient is a numerical measure of how well the membrane can discriminate against the interfering ion. To put this in perspective, if an electrode has equivalent responses to the two ions, then kij = 1.0.
What is selectivity coefficient?
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 is potentiometric selectivity coefficient?
https://doi.org/10.1351/goldbook.P04791. A. coefficient. which defines the ability of an ion-selective electrode to distinguish a particular ion from others.
What is ion-selective electrode method?
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 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. 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.
What does the selectivity coefficient tell us is it better to have a large or a small selectivity coefficient?
For reference: Definition of selectivity coefficient where ai represents the activity of an ion other than the target ion denoted by i, and is a value indicating the impact that ion B has on the sensor used to measure ion A. The smaller this value, the better the selectivity with respect to the target ion.
What is selectivity in database?
Why are the selectivity and cardinality used in databases? The selectivity basically is a measure of how much variety there is in the values of a given table column in relation to the total number of rows in a given table. The cardinality is just part of the formula that is used to calculate the selectivity.
What is an ion-selective electrode give examples?
The most important ion-selective electrodes for pH determination are glass electrodes, liquid membrane electrodes, and ion-sensitive field-effect transistors (ISFETs). Glass pH electrode. The glass pH electrode used to measure water acidity is the most common example of an ion-selective electrode.
What is meant by the selectivity of a resin?
of ion exchange resins. The selectivity coefficient of resins is defined in the ion exchange reactions page. The affinity of the resin for an ion is governed by the size of its hydrated form as well as its charge. The larger the ion, the more the resin bead must expand to accommodate it in the structure.
What is basic resin?
The strongly basic anion exchange resin is an anion exchange resin with quaternary ammonium groups incorporated into the styrene frame. The strongly basic resin is used to produce high purity demineralized water, making use of the capability to strongly adsorb anions.
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.