Separation and microdetermination of chlorine and bromine in an organic compound by ion-exchange chromatography

Organic elemental analysis using a microbomb. IV

Abstract

An organic compound containing chlorine and bromine was decomposed, as described in the preceding report, in a microbomb by the sodium peroxide method. The product was treated as usual and concentrated to 10 ml of a neutral solution ( the concentration of NaNO₃ was 2.53.0 M). This was absorbed in Dowex 1-X 10 column (3 cm²×10 cm) previously exchanged with NO₃^-; and 70ml of 0.5 M NaNO₃ was passed through at the rate of 3.0 ml/min to obtain the first effluent containing Cl^- only. Then 70 ml of 2 M NaNO₃ was passed through to obtain the second effluent containing Br^- only; and each of the separated ions was determined by a gravimetric method as the silver salt. The error of analysis was ±0.5% About 10 mg of the sample is required.