Équilibres de phases en chromatographie micellaire. Corrélation LSER de la constante d'équilibre micelle-eau

Abstract
Micellar liquid chromatography allows to detemine micelle-water equilibrum constant K_MW. Capacity factors of fifty solutes of various polarities are measured using cationic and anionic micellar mobilephase and a C ₁₈ silica column. The solvatochromic parmeters of the solutes are used to establish a convenient LSER (linear solvation equation relationship) correlations for the capacity factors. Using the Armstrong model, the micelle-water equilibrum constant K_MW of tbe solutes used are determined d'Armstrong, The LSER equations found for K_MW give a a straights with a correlation coefficient higher than 0.95. For the two used surfactants, The LSER coefficients found allow to conclude that the size of the solute is the most influencial parmeter on micelle-water equilibrum constant K_MW followed by the solute basicity.