Testing Procedure (Method of analysis) for Antimony, Arsenic and Barium Salts

Antimony Compounds

Dissolve with gently heating about 10 mg of the substance under examination in a solution of 0.5 g of sodium potassium tartrate in 10 ml of water and allow to cool. To 2 ml of this solution or to 2 ml of the prescribed solution add sodium sulfide solution dropwise; a reddish orange precipitate which dissolves by adding dilute sodium hydroxide solution is produced.

Arsenic Compounds

Heat 5 ml of the prescribed solution on a water-bath with an equal volume of hypophosphorous reagent; a brown precipitate is formed.

Barium Salts

A. Barium salts impart a yellowish green color to a nonluminous flame which appears blue when viewed through a green glass.

B. Dissolve 20 mg of the substance under examination in 5 ml of dilute hydrochloric acid and add 2 ml of dilute sulphuric acid; a white precipitate, insoluble in nitric acid, is formed.