Antimony Sodium Tartrate
(an' ti moe'' nee soe' dee um tar' trate).
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C8H4Na2O12Sb2 581.61

Antimonate(2-), bis[µ-[2,3-dihydroxybutanedioato(4-)-O1,O2:O3,O4]]di-, disodium, stereoisomer.
Disodium bis[µ-[l-(+)-tartrato(4-)]]diantimonate(2-) [34521-09-0].
» Antimony Sodium Tartrate contains not less than 98.0 percent and not more than 101.0 percent of C8H4Na2O12Sb2, calculated on the dried basis.
Packaging and storage— Preserve in well-closed containers.
Identification— It responds to the tests for Antimony 191, for Sodium 191, and for Tartrate 191.
Acidity or alkalinity— Dissolve 1.0 g in 50 mL of carbon dioxide-free water, and titrate with 0.010 N hydrochloric acid or 0.010 N sodium hydroxide to a pH of 4.5: not more than 2.0 mL is required.
Loss on drying 731 Dry it at 105 to constant weight: it loses not more than 6.0% of its weight.
Lead 251: not more than 0.002%.
Assay— Dissolve about 500 mg of Antimony Sodium Tartrate, accurately weighed, in 50 mL of water, add 5 g of potassium sodium tartrate, 2 g of sodium borate, and 3 mL of starch TS, and immediately titrate with 0.1 N iodine VS to the production of a persistent blue color. Each mL of 0.1 N iodine is equivalent to 14.54 mg of C8H4Na2O12Sb2.
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Behnam Davani, Ph.D., M.B.A.
Senior Scientific Liaison
(SM12010) Monographs - Small Molecules 1
USP35–NF30 Page 2229