Ion-interaction Rp-HPLC separation of inorganic anions on porous graphitized carbon stationary phase. Comparison with ods stationary phase

This paper shows how a porous graphitized stationary (PGC) phase can be mod ified to work in RP-HPLC ion-interaction reagent (IIR) mode. Aqueous soluti ons of alkylammonium o-phosphate salts are used as IIRs and the analytes ar e the inorganic anions, iodide, iodate, bromide, bromate, nitrite, and nitr ate. Comparisons with the results obtained under the same conditions for an ODS stationary phase show that the use of the PGC column permits extension, to IIR chromatography, in the pH range of only acidic values.