Rapid Determination of Anions (PO3-4,SO2-4 and NO-3) in the Drink “Coca Cola” by Ion Chromatography

In the rapid ion-chromatographic determination of PO3-4,SO2-4 and NO-3 anions in the drink “Coca Cola”,the combining use of the columns of Dionex IonPac AS14 and IonPac AG14 was substituted by the single used of the IonPac AG14A,as chromatographic column which made the 3 anions separated satisfactorily within 3 min.A mixed solution of 5 mmol·L-1 Na2CO3 and 6 mmol·L-1 NaHCO3 was used as mobile phase.The drink sample,after de-gasing,was passed through columns of Dionex On-Guard P and RP successively to remove those possibly co-existing phenols and macromolecular compounds,before the separation in IonPac AG14A.Precision of the determination was tested,and values of RSD′s (n=6) found for the 3 anions were less than 0.2%.Values of recovery obtained were in the range of 90.5%-103.2%.