Packaging and storage—
Preserve in tight, light-resistant containers.
Identification—
B:
Dissolve about 10 mg in 5 mL of water, and add 0.5 mL of 3 N hydrochloric acid, 0.5 mL of sodium nitrite solution (1 in 10), and a solution of 0.20 g of 2-naphthol in 10 mL of 6 N ammonium hydroxide: a red color is produced.
Loss on drying 
731
—
Dry it at 105
for 2 hours: it loses not more than 0.25% of its weight.
Heavy metals, Method II 231:
0.001%.
Assay—
Transfer about 150 mg, accurately weighed, of Aminohippuric Acid to a beaker or a casserole. Add 5 mL of hydrochloric acid and 50 mL of water, and proceed as directed under
Nitrite Titration 451, beginning with “stir until dissolved.” Each mL of 0.1 M sodium nitrite is equivalent to 19.42 mg of C
9H
10N
2O
3.
;)
