distribution coefficient


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distribution coefficient

[‚dis·trə′byü·shən ‚ko·i′fish·ənt]
(optics)
One of the tristimulus values of monochromatic radiations having equal power, usually denoted by x, y, z.
(physical chemistry)
The ratio of the amounts of solute dissolved in two immiscible liquids at equilibrium.
References in periodicals archive ?
Table-5 presents the distribution coefficients data for Pb(II) ion and the thermodynamic functions of the adsorption process of Pb(II) ion at different temperature and pH values [44].
It is clear that under the cow dung treatment, Ni was present in soil in soil mainly in oxidisable and residual fractions, and the sum of the distribution coefficients ranged from 59.5% to 77.4%.
The MM 280/254 nm distribution coefficient varies in different directions: It increases only in case of regional metastasis and decreases in case of a distant metastasis for both histological types of the NSCLC.
(b) [M.sub.0] = the initial release concentration of formaldehyde from wood composites; [C.sub.0s] = initial formaldehyde concentrations in wood composites; K = formaldehyde distribution coefficient between wood composites and air; f = dimensionless thickness correction factor; D = formaldehyde internal diffusion coefficient; [h.sub.g] = mass transfer coefficient of formaldehyde in the air phase.
The distribution coefficients were obtained from the initial slope of the plots shown in Figure 5 according to (2), whereas [K.sub.x] were calculated with the relation [K.sub.x] = 55.5[K.sub.S].
--[K.sup.mean.sub.i] = 0,5([K.sup.b.sub.i] + [K.sup.e.sub.i])--mean values of ionol distribution coefficient at [K.sup.b.sub.i] (given the temperature [t.sub.b] at thermic range beginning) and [K.sup.e.sub.i] (given the temperature [t.sub.e] at thermic range ending) within the given temperatures range;
Furthermore, the design parameters and thermodynamics feasibility factors such as phase volume ratio, preconcentration factor, distribution coefficient, the efficiency of the process, change in enthalpy ([[DELTA]H.sub.0] ), change in entropy ([[DELTA]S.sup.0]), and change in Gibbs free energy ([[DELTA]G.sup.0]) have been investigated.
Some researchers [7,22] believe that manganese increases along with meteoric diagenetic processes, because the distribution coefficient of Mn is high in the meteoric waters so that reaches about 15ppm, in conclusion considerable amount of Mn will be entered into the calcite network.
From the experimental data, selectivity, S, and distribution coefficient, B, were calculated to determine the feasibility of [MMim][MeS[O.sub.4]] in solvent extraction processes.
Equilibrium is maintained at the solidification front, i.e., the composition of the solid phase is equal to the product of the distribution coefficient by the concentration of the liquid at the solidification front.
Also, in a bid to study adsorptive behavior of the prepared adsorbents, distribution coefficient of heavy metals, radionuclides and other pollutants were measured and parameters influencing the adsorption process like pH, time and temperature were optimized.

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