(from the article `chromatography`) ...involves samples that contain both weakly and strongly retained solvents. This is handled in a manner analogous to the temperature programming ... Found on http://www.britannica.com/eb/a-z/g/55
Elution in column chromatography in which a changing pH or ionic strength is used to separate substances. ... (05 Mar 2000) ... Found on http://www.encyclo.co.uk/local/20973