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USP32-NF27 191 IDENTIFICATION TESTS¡ªGENERAL

Sulfate¡ª With barium chloride TS, solutions of sulfates yield a white precipitate that is insoluble in hydrochloric acid and in nitric acid. With lead acetate TS, neutral solutions of sulfates yield a white precipitate that is soluble in ammonium acetate TS. Hydrochloric acid produces no precipitate when added to solutions of sulfates (distinction from thiosulfates).

EP 2.3.1 Identification reactions of ions and functional groups
SULFATES
a) Dissolve about 45 mg of the substance to be examined in 5 mL of water Roruse 5 mL of the prescribed solution.
Add 1 mL of dilute hydrochloric acid R and 1 mL of barium chloride solution R1. A white precipitate is formed.
b) To the suspension obtained during reaction (a), add 0.1 mL of 0.05 M iodine . The suspension remains yellow (distinction from sulfites and dithionites), but is decolorised by adding dropwise stannous chloride solution R (distinction from iodates). Boil the mixture. No coloured precipitate is formed (distinction from selenates and tungstates).

JP 16 1.09 Qualitative Tests
Sulfate
(1) Solutions of sulfates yield with barium chloride TS a white precipitate, which does not dissolve upon addition of dilute nitric acid.
(2) Neutral solutions of sulfates yield with lead (II) ace-tate TS a white precipitate, w hich dissolves upon subsequent addition of ammonium acetate TS.
(3) When an equal volume of dilute hydrochloric acid is added, solutions of sulfates yield no white turbidity (dis-crimination from thiosulfates), and do not evolve the odor
of sulfur dioxide (discrimination from sulfites).

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