Penetration isotherms of binary mobile phases for liquid chromatography

Acetonitrile as tops solvent for liquid chromatography and extraction

“…Studies [15,16] demonstrate that density isotherms ρ 12 =f( 2 ) for binary solvent mixtures are adequately described by the binomial equation: (Figure 1) slightly expressed non-linear characteristic (non-additivity) from the composition for the dependence ρ 12 =f( 2 ). Temperature monotonously decreases with the density increase.…”

“…This effect is conditioned by the fact that the balance between homo-and hetero-intermolecular associates is shifted towards "looser" homoand hetero-intermolecular structures. It should be noted that this effect is stronger expressed for mixtures, in which water forms hydrogenic bindings with modificators (alcohol, THF) [15,16] . Figure 1.…”

“…A rational equation 3has been suggested [17] for approximation of dependences; it describes experimental data with high degree of approximation. 23 o C. According to the data of [18] According to the data of [19]…”

“…An interesting observation has been made in the study [19] , which investigated permeability coefficient ψ equal to the ratio of the surface tension coefficient to the dynamic viscosity coefficient of binary solutions (ψ=Ϭ/η, dimension m/sec). ψ 12 for binary systems water-an organic solvent has been found to be properly approximated by a modified polinominal of the 3 rd degree:…”