Dried Ferrous Sulfate
Sulfuric acid, iron(2+) salt (1:1), hydrate.
Iron(2+) sulfate (1:1) hydrate [13463-43-9].
Anhydrous 151.91 [7720-78-7].
» Dried Ferrous Sulfate contains not less than 86.0 percent and not more than 89.0 percent of anhydrous ferrous sulfate (FeSO4).
Packaging and storage Preserve in well-closed containers.
Insoluble substances Dissolve 2.0 g in 20 mL of freshly boiled dilute sulfuric acid (1 in 100), heat to boiling, and digest in a covered beaker on a steam bath for 1 hour. Filter through a tared filtering crucible, wash thoroughly, and dry at 105: the weight of the insoluble residue does not exceed 1 mg (0.05%).
Lead Using Dried Ferrous Sulfate, proceed as directed in the test for Lead under Ferrous Sulfate: the limit is 0.001%.
Assay Dissolve about 800 mg of Dried Ferrous Sulfate, accurately weighed, in a mixture of 25 mL of 2 N sulfuric acid and 25 mL of freshly boiled and cooled water. Add orthophenanthroline TS, and immediately titrate with 0.1 N ceric sulfate VS. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N ceric sulfate is equivalent to 15.19 mg of anhydrous ferrous sulfate (FeSO4).
Auxiliary Information Please check for your question in the FAQs before contacting USP.Chromatographic Column
USP32NF27 Page 2366
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.