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Barium Sulfate
CAS Number: 7727-43-7
Molecular Formula: BaSO4
Molecular Weight: 233.39
Barium Sulfate
Barium Sulfate USP Grade Specifications
BaSO4 233.39
Sulfuric acid, barium salt (1:1) --- CAS 7727-43-7
Barium Sulfate contains not less than 97.5 percent and not more than 100.5 percent of BaSO4.
Identification—
A: Mix 0.5 g with 2 g each of anhydrous sodium carbonate and anhydrous potassium carbonate, heat the mixture in a crucible until fusion is complete, treat the resulting fused mass with hot water and filter: the filtrate, acidified with hydrochloric acid, meets the requirements of the tests for Sulfate.
B: Dissolve a portion of the well-washed residue from Identification test A in 6 N acetic acid: the solution meets the requirements of the tests for Barium.
pH: between 3.5 and 10.0, in a 10% (w/w) aqueous suspension.
Heavy metals— Boil 4.0 g with a mixture of 2 mL of glacial acetic acid and 48 mL of water for 10 minutes. Dilute with water to 50 mL, filter, and use 25 mL of the filtrate: the limit is 0.001%.
Limit of sulfide— To 10 g in a 500-mL conical flask add 100 mL of 0.3 N hydrochloric acid. Cover the mouth of the flask with a circle of filter paper that has been moistened at the area over the mouth of the flask with 0.15 mL of lead acetate TS, the paper being held in place with a string tied around the neck of the flask. Boil the mixture gently for 10 minutes, taking care to avoid spattering the paper. Any darkening of the paper is not greater than that produced by a similarly treated control consisting of 100 mL of 0.3 N hydrochloric acid containing 5 :g of sulfide: not more than 0.5µg per g is found.
Limit of acid-soluble substances— Cool the mixture obtained in the test for Limit of sulfide, add water to restore approximately the original volume, and filter it through paper that previously has been washed with a mixture of 10 mL of 3 N hydrochloric acid and 90 mL of water, returning the first portions, if necessary, to obtain a clear filtrate. Evaporate 50 mL of the filtrate on a steam bath to dryness, and add 2 drops of hydrochloric acid and 10 mL of hot water. Filter again through acid washed paper, prepared as directed above, wash the filter with 10 mL of hot water, and evaporate the combined filtrate and washings in a tarred dish on a steam bath to dryness. The residue, when dried at 105 for 1 hour, weighs not more than 15 mg: not more than 0.3% of acid-soluble substances is found.
Limit of soluble Barium salts— Treat the residue obtained in the test for Limit of acid-soluble substances with 10 mL of water, pass the solution through a filter previously washed with 100 mL of 0.3 N hydrochloric acid, and add 0.5 mL of 2 N sulfuric acid. Any turbidity formed within 30 minutes is not greater than that produced in a similarly treated control consisting of 10 mL of water containing 0.5 mL of 2 N sulfuric acid and 50 :g of barium: not more than 0.001% of soluble barium salts is found.
We also supply BP Ph Eur JP EP Grade of Barium Sulphate.
Please visit SDS Safety Data Sheet of Barium Sulfate Suppliers.
American Molecules, also known as ammol.org is a distributor, supplier and manufacturers' representative of all types of Pharmaceuticals, Functional Ingredients, Excipients and Specialty Chemicals in Texas USA. Our principals manufacture supply and export USP NF BP, Ph Eur, etc grades of chemicals pure and reagent grade, mineral fortifiers, FCC food grade. Tailor made particle size and customized specifications are offered. The principal's facility is having one or more of the certifications like FDA approval and GLP, cGMP, ISO9001, ISO14001, ISO/IEC 17025, ISO22000, FSSC 22000, ISO45001, FSSAI, Kosher, HALAL, COPP, WHO-GMP certified and Written Confirmation (WC) for export to Europe is available. The manufacturers suppliers and exporters observe WHO Good Manufacturing Practices and Good Laboratory Practices.
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