John R Jezorek

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A number of factors related to the metal-ion reactivity of silica-bound complexing agents are discussed. The metal-uptake capacity of alkylamines immobilized on silica is shown to be reduced by hydrolysis of bound ligand from the surface, by protonation in aqueous buffers, and by an apparent air oxidation of the amine group or other deactivation process. A(More)
We demonstrate in this report that a conventional silica-based strong anion-exchange column can exhibit reversed-phase chromatographic behavior simultaneously with ion-exchange in a methanol-aqueous phthalate mobile phase. Reversed-phase behavior is shown for PAHs in relatively high methanol-content mobile phases, while polar organics exhibit reversed-phase(More)
It is demonstrated in this report that a conventional strong-acid cation-exchange column can exhibit reversed-phase chromatographic behavior simultaneously with ion-exchange. Adjusting the pH to control cation retention has no effect on the retention of neutral organic analytes. Likewise, changes in the methanol content of the mobile phase to adjust organic(More)
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