Anion Exchange-Ion Chromatographic Determination of Acetate Phosphate and Citrate in Cigarette Paper

The objective anions (acetate,phosphate and citrate) were extracted ultrasonically from cigarette paper with water,and the extract obtained was filtered with 0.45 μm filtering membrane,and introduced into the instrument for IC determination. IONPAC AS15 column was used for separation,and the IONPAC AG15 was used as guard column. Seventy 70 mmol·L-1 NaOH solution was used as eluent for gradient elution. Conductivity detection was adopted in the determination. Linear relationships between values of integrals of peak area and concentration of the 3 anions were obtained in the ranges of 0.2-50 mg·L-1 (for acetate),0.5-50 mg·L-1 (for phosphate) and 0.5-100 mg·L-1 (for citrate),with detection limits (3S/N) of 0.2,0.4,0.5 mg·L-1 respectively. Precision of the method was tested by analyzing a mixed standard solution containing 5 mg·L-1 of acetate and 10 mg·L-1 each of phosphate and citrate,values of RSD′s (n=7) obtained were 1.2%,1.8% and 1.3% respectively. Recovery was tested at 3 different concentration levels,and the results obtained were in the ranges of 96.6%-106.5% (for acetate),94.5%-107.8% (for phosphate) and 88.3%-103.6% (for citrate).