ionic strength


Also found in: Encyclopedia, Wikipedia.

i·on·ic strength (I),

symbolized as Γ/2 or I and set equal to 0.5Σmizi2, where mi equals the molal concentration and zi the charge of each ion present in solution; if molar concentrations (ci) are used instead of molality (and the solution is dilute), then I = 0.5(1/ρocizi2 where ρo is the density of the solvent; a number of biochemically important events (for example, protein solubility and rates of enzyme action) vary with the ionic strength of a solution.

i·on·ic strength

(I) (ī-on'ik strengkth)
Symbolized as Γ/2 or I and set equal to 0.5Σmizi2, where mi equals the molar concentration and zi the charge of each ion present in solution; if molar concentrations (ci) are used instead of molality (and the solution is dilute), then I = 0.5(1/ρocizi2 where ρo is the density of the solvent; a number of biochemically important events (e.g., protein solubility and rates of enzyme action) vary with the ionic strength of a solution.
References in periodicals archive ?
Plants kept under 50% I presented higher [A.sub.net] values, relative to those under the remaining ionic strengths, from the first evaluation, even with patterns of [g.sub.s] close to those under more elevated ionic strengths up to 98 DAT.
The adsorptivity of glucose to the CIPC also increases with increasing ionic strength (Figure 5).
The surface ionic mobility (simply called the ionic mobility) in sand-bentonite mixtures of different proportions, estimated at the mean ionic strength of the hydration layers, increased with the expanding hydration layers.
(1980) to interpret the effect of ionic strength on phosphate adsorption by variable charge soils; (3) to test the hypothesis of the adsorption model with zeta potential measurements.
Hydrogels show drastic changes in their swelling ratio due to changes in their external pH, temperature, ionic strength, nature of the swelling agent and electromagnetic radiation.
Effect of Ionic Strength on Pulp Flocculation Induced by Retention Aids
We investigated the optimum ionic strength for the silica immunoagglutination assays by adding various concentrations of NaCl to the assay buffer solution (see Fig 2 in the online Data Supplement).
This enzyme-F-actin equilibrium is not only influenced by pH and ionic strength, but by metabolites as well, and is postulated to be electrostatic in nature (5).
In amphiprotic solvents, such as water, the surface charge is counterbalanced by both cations and anions, the ionic strength is greater, and the double layer is more compact, which results in a slower EOF.
Ideally an inert material could be added which would decrease water activity without any other effects such as increased ionic strength and decreased surface tension.