Packaging and storage— Preserve in tight, light-resistant containers, and store in a cool place.

Identification— A 6-g portion dissolves in 600 mL of water with effervescence. The collected gas meets the requirements of the test for Bicarbonate 191, and the resulting solution meets the requirements of the tests for Iron 191 and for Citrate 191.

Uniformity of dosage units 905—

Deliverable volume 698—

Residual solvents 467: meets the requirements.

Assay— Transfer about 6 g of Ferric Ammonium Citrate for Oral Solution, accurately weighed, to a 250-mL conical flask, and dissolve in 100 mL of water. Allow the gas to escape, add 5 mL of hydrochloric acid and 4 g of potassium iodide, insert the stopper, and allow to stand protected from light for 15 minutes. Add 25 mL of water, and titrate the liberated iodine with 0.1 N sodium thiosulfate VS, using starch TS as the indicator. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N sodium thiosulfate is equivalent to 5.585 mg of Fe.

Expert Committee : (RMI05) Radiopharmaceuticals and Medical Imaging Agents 05

USP29–NF24 Page 152

Phone Number : 1-301-816-8305