Adsorption TLC with binary mobile phases

Study of copper complexes in saturated and unsaturated aqueous ammonium oxalate solutions containing Cu(II) impurity

“…It may be seen that, for a given value of concentration c of AO, the molar absorptivity ε lies between 10 and 34 dm 3 /mol cm and increases slightly (less than 2%) with an increase in the impurity concentration c i . The value of ε between 10 and 34 dm 3 /mol cm is typical for spin-allowed transitions in complexes, like pure octahedral species, having a centre of sym- metry [22]. This dependence of ε on c may be explained from a consideration of the concentration of species involved in the absorption of light.…”

“…Obviously, θ = 0 and θ = 1 are the limits of the appearance and disappearance of the complex formed in the interval of the concentration ratio c i /c. When the coverage θ is described by Temkin and Langmuir adsorption isotherms [22] Eq. (3) may be written in the form…”

Behavior of cationic surfactants and short chain alcohols in mixed surface layers at water–air and polymer–water interfaces with regard to polymer wettability. I. Adsorption at water–air interface

“…It seems that such condition is fulfilled for aqueous solutions of CTAB or CPyB with alcohol mixtures only in the case of cationic surfactants. Therefore, to determine the real surface concentration of alcohol the Gibbs surface excess concentration of alcohol should be recalculated from the GuggenheimAdam equation having the following form [39,40]:…”

A linear relationship between partition ratio and composition of a binary mobile phase in reversed‐phase liquid chromatography using chemically bonded stationary phases

“…Under these conditions [13][14][15] Similarly, the distribution coefficient K, (, , , ) (i = 1,2), determining the partition of the sth solute between the ith pure solvent (mobile phase) and chemically bonded phase (stationary phase), is…”