ION-EXCHANGE PROPERTIES OF GLUTAMIC ACID-BONDED SILICA

The chromatographic behaviour of alkali, alkaline earth and some trans ition metals on the glutamic acid-bonded silica stationary phase was i nvestigated using dilute solutions of perchloric acid as eluent. The e ffect of different classes of organic modifiers as well as the influen ce of temperature on the retention of cations were studied. Sorption h eats for cations under different conditions were calculated. These inv estigations allowed the chromatographic separation conditions, under w hich either complex forming or ion-exchange mechanisms prevail, to be determined.