The retention model in HPLC is proposed, which is based on quasichemical equilibria of the components of the chromatographic system. This model provides a better undestanding of the retention mechanism in HPLC and it can be applied for quantitative description of the dependence of retention on the nature and composition of the mobile phase. H i g h performance liquid chromatography (HPLC) is kn...

Pulsed field gradient (PFG) NMR at high magnetic is used to study molecular self-diffusion of ethylene, ethane, and propylene in a 2-ethylimidazole (eIm) linker-doped ZIF-8. These eIm-doped materials were synthesized by incorporating increasing fractions the non-native eIm linker, which substitutes native 2-methylimidazole linker ZIF-8 framework. Self-diffusion three hydrocarbon gases was measu...

Can the sorption mechanism be proven by fitting an isotherm model to experiment? Such a question arises because (i) multiple models, with different assumptions on mechanisms, often fit experimental equally well, (ii) some models [such as Brunauer–Emmett–Teller (BET) and Guggenheim–Anderson–de Boer (GAB)] isotherms that do not satisfy underlying of model, (iii) (such Oswin Peleg) are empirical e...

The higher aquatic plant cattails has a wide distribution area, grows almost all over the world and number of unique properties. One these properties is sorption perianth fuzz cattail cobs. high capacity cobs difficult to explain from standpoint small specific surface area this material. data obtained by authors а presented on characteristics Typha latifolia as sorbent oil products. VOPR reache...

Natural toxins are multifunctional, often ionizable organic compounds increasingly detected in the environment. Surprisingly little is known about their interactions with soil carbon, although sorption largely controls transport, bioavailability, and dissipation. For a set of 117 natural from 36 compound classes pH-dependent carbon–water distribution coefficient (Doc) was quantified using colum...

Binary systems consisting of 1,2-dichlorobenzene (12DCB) + competitor were investigated over a range of concentrations of competitor in three natural sorbents with distinct characteristics. Two models, the ideal adsorbed solution theory (IAST) and the potential theory (Polanyi-based multisolute model), widely used in the prediction of multisolute sorption equilibrium from single-solute data, we...

The uptake and release of sorbates into films and coatings is typically accompanied by changes of the films' refractive index and thickness. We provide a comprehensive model to calculate the concentration of the sorbate from the average refractive index and the film thickness, and validate the model experimentally. The mass fraction of the analyte partitioned into a film is described quantitati...

The sorption behaviors of 4 cyclic and linear volatile methyl siloxane (VMS) compounds between water and organic matter in 3 United Kingdom soils were studied by a batch equilibrium method using(13)C-enriched sorbates. Sorption and desorption kinetics and isotherms were determined for octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), octamethyltrisiloxane (L3), and decamethy...