2004 Volume 53 Issue 4 Pages 213-217
The separation factor of chlorine isotopes was precisely determined by using anion-exchange chromatographic technique, which employed a 1.5 m-long column. Hydrochloric acid (0.1 mol/L) solution was fed into the column with the flow rate of 1.5 mL/min. The magnitude of the factor obtained was 1.00023±0.00006 (1δ) at 25 °C. The result was in good agreement with the results obtained in previous works, and showed that the lighter isotope (35Cl) was preferentially fractionated into the resin phase, while the heavier one (37Cl) was enriched into the aqueous phase. This trend suggested that Cl- ions hydrated in the aqueous phase were slightly more stable than the hydrated Cl- ions interacting with the ion-exchange sites of the resin.