Abstract
Polymer-based cation exchange capillary monolithic column was prepared for capillary ion chromatography(CIC) by radical polymerization in a 320-μm-i.d.fused-silica capillary tube,taking glycidyl methacrylate(GMA) as the functional monomer,ethylene dimethacrylate(EDMA) as the cross-linking agent and in the presence of 1,4-butanediol,1-propanol and water as the porogen solvents and azobisisobutyronitrile(AIBN) as a suitable initiator.Introduction of cation exchange sites was achieved by reacting with Na2SO3.Coupled with the prepared cation exchange capillary monolithic column,a capillary ion chromatography system was constructed with a pump(in μL/min level),a capillary detection cell and a UV detector,on which more chromatographic characteristics were further studied.With the CIC system,9 common univalent and divalent cations(Li+,Na+,NH4+,K+,Cs+,Mg2+,Ca2+,Sr2+,Ba2+) were successfully separated and determined by flow rate gradient.Another interesting separation of cations and melamine was also tested on the prepared column.
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