Preferred Label : suspension effect;
Detailed label : suspension effect in an ion-selective electrode;
IUPAC definition : An effect which occurs when ion-selective electrodes are used in concentrated, space-filled
suspensions while the external reference electrode remains in the supernatant (suspension-free)
solution. The suspensions are specifically solvent-swollen ion exchangers or other
materials, like soils and clays, that concentrate ions by adsorption and absorption.
Space-filled, gravity-packed suspensions act like a second phase and form apparently
an interfacial potential difference (PD) with respect to the supernatant. The measured
ion activity in the suspension differs from the value in the supernatant by the interfacial
PD, and corresponds to a higher value approximating the activity inside the ion exchanger
gel. The effect nearly disappears when the outer reference electrode is placed in
the same region of the suspension as the sensor electrode. There are some changes
in the junction potential differences of the reference electrode, between suspension
and supernatant.;
Origin ID : S06199;
See also
An effect which occurs when ion-selective electrodes are used in concentrated, space-filled
suspensions while the external reference electrode remains in the supernatant (suspension-free)
solution. The suspensions are specifically solvent-swollen ion exchangers or other
materials, like soils and clays, that concentrate ions by adsorption and absorption.
Space-filled, gravity-packed suspensions act like a second phase and form apparently
an interfacial potential difference (PD) with respect to the supernatant. The measured
ion activity in the suspension differs from the value in the supernatant by the interfacial
PD, and corresponds to a higher value approximating the activity inside the ion exchanger
gel. The effect nearly disappears when the outer reference electrode is placed in
the same region of the suspension as the sensor electrode. There are some changes
in the junction potential differences of the reference electrode, between suspension
and supernatant.
