The comparative investigation of several stationary phases containing iminodiacetic functional groups for the high performance chelating exchange chromatographyстатья
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Аннотация:Three chelating ion-exchangers having iminodiacetic acid functional groups immobilised at the surface of different substrates (silica gel, hydrophilic and hydrophobic polymer matrices) were compared for the separation of various alkaline earth and transition metal ions. The retention of metal ions on two commercially available Diasorb IDA silica (250 mm x 4 mm id.) and Tosoh TSK Gel Chelate 5 PW (75 x 7 mm id.) columns and column packed with poly(styrene-divinylbenzene) substrate coated with Phthalein Purple dye was investigated in maleate, tartrate and oxalate mobile phases. Metal-ion retention increased with pH and with a decrease in eluent concentration. The complexing ability of ion-exchangers decreased in the order IDA silica > TSK Gel Chelate 5 PW > polystyrene-divinylbenzene coated with Phthalein Purple dye. The selectivity of separation was similar for IDA-silica and TSK Gel Chelate 5 PW and was slightly different for the dye coated column. The chromatographic separation of metal ions is demonstrated in oxalate and tartrate mobile phases.