ABSTRACT
Because « residues » are generally distributed throughout complex matrices, they are difficult if not impossible to analyse without firstly isolating them. Chromatography, from the Greek khromatos: colour and graphein: to write, is a physical method of analysis, involving separation and identification of the different constituents of a mixture. The constituents distribute, according to their chemical nature and by repeated exchange, between a fixed, or stationary, phase and a mobile phase.
