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How High Pressure Unifies Solvation Processes in Liquid Chromatography
Szymon Bocian1, Tea Škrinjar2, Tomislav Bolanca3
1Nicolaus Copernicus University, Faculty of Chemistry, Environmental Chemistry and Bioanalytics, 7 Gagarin St, 87-100 Toruń, Poland.
Abstract:
A series of core-shell-based stationary phases of varying surface chemistry were subjected to solvent adsorption investigation under ultra-HPLC conditions. Acetonitrile and water excess isotherms were measured using a minor disturbance method. It was observed that adsorption of organic solvent is unified under high pressure. Preferential solvation due to specific interactions between the stationary phases and solvent molecules was limited. The obtained results showed that the solvation process is almost independent of surface chemistry, in contrast to HPLC conditions in which specific interactions differentiate solvation processes.
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