Identification
A: Infrared Absorption.
B: To 5 mL of a solution (1 in 250) in a test tube add 1 mL of 5 N sodium hydroxide and 10 drops of 30% hydrogen peroxide, and heat gently for about 2 minutes: a yellow color develops.
Loss on drying: Dry it at 105C for 4 hours: it loses not more than 4.0% of its weight.
Chloride: Dissolve 30 mg of Chromium Picolinate in 30 to 40 mL of water, and heat to 70C. Cool overnight, and filter to remove the precipitate. Add 1 mL each of nitric acid and silver nitrate TS, and add sufficient water to make 50 mL. Mix, and allow to stand for 5 minutes, protected from direct sunlight: any turbidity formed is not greater than that produced in a similarly treated control solution containing 0.25 mL of 0.002 N hydrochloric acid (0.06%).
Sulfate: Dissolve 100 mg of Chromium Picolinate in 30 to 40 mL of water, and heat to 90C. Cool overnight, and filter to remove the precipitate. Add 1 mL of 3 N hydrochloric acid, 3 mL of barium chloride, and sufficient water to make 50 mL. Mix, and allow to stand for 10 minutes: any turbidity formed is not greater than that produced in a similarly treated control solution containing 0.2 mL of 0.02 N sulfuric acid (0.2%).
