On-line Dialysis-Ion Chromatographic Determination of Inorganic Anions in Vegetables

A method of on-line dialysis hyphenated with ion chromatography for the determination of inorganic anions in vegetables was reported in this paper.The vegetable sample was extracted and on-line treated with dialysis and the clean solution was then introduced for separation with the Metrosep A Supp 4-250 Anion Exchanger Column.A mixed solution of 1.8 mmol·L-1 Na2CO3 and 1.7 mmol·L-1 NaHCO3 was used as mobile phase and conductivity detector was used in the determination.DL (3S/N) of the anions in this method were in the range of 1-18 μg·L-1.The proposed method was used for determination of the anions F-,Cl-,Br-,NO-2,NO-3,PO3-4 and SO2-4 in a vegetable sample with complex matrix,giving values of recovery of the anions over 78% and values of RSD′s (n=6) in the range of 1.8% to 6.1%.