Potassium Benzoate
» Potassium Benzoate contains not less than 99.0 percent and not more than 100.5 percent of C7H5KO2, calculated on the anhydrous basis.
Packaging and storage
Preserve in well-closed containers.
Alkalinity
Dissolve 2 g in 20 mL of hot water, and add 2 drops of phenolphthalein TS: the pink color produced, if any, is discharged by the addition of 0.20 mL of 0.10 N sulfuric acid.
Water, Method I 921:
not more than 1.5%.
Heavy metals 231
Dissolve 4.0 g in 40 mL of water, add, dropwise, with vigorous stirring, 10 mL of 3 N hydrochloric acid, and filter. Use 25 mL of the filtrate: the limit is 0.001%.
Assay
Transfer about 600 mg of Potassium Benzoate, accurately weighed, to a 250-mL beaker. Add 100 mL of glacial acetic acid, stir until the assay specimen is completely dissolved, add 2 drops of crystal violet TS, and titrate with 0.1 N perchloric acid VS. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N perchloric acid is equivalent to 16.02 mg of C7H5KO2.
Auxiliary Information
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Chromatographic Column
USP32NF27 Page 1321
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.
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