Abstract
The determination of trace amount calcium in high purity sodium chloride has been studied byseparating it with chelating resin and determining it atomic absorption spectrophotometrically.
After refining the chelating resin by batch method, it was used for treatment. The effect ofpH of sample solution and the effect of concentration of sodium chloride on the treatment withresin were comparatively little.
The procedure was as follows. The sample solution was allowed to pass through the columnpacked with 1 g of the Na+-form wet resin. Then the columnwas washed with distilled water andeluted with 2N-HNO3. The effluent was analyzed by atomic absorption spectrophotometer. Magnesium, potassium, iron, copper and zinc did not interfere, and a coefficient of variation ofthis method was 2.5%.
The application of the method proposed here for high purity salts has provided a convenient method for the determination of calcium.
