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Calcium Sulfate
FCC V
CaSO4 Formula wt, anhydrous 136.14
CaSO4·2H2O Formula wt, dihydrate 172.18
INS: 516 CAS: anhydrous [7778-18-9]
CAS: dihydrate [10101-41-4]
DESCRIPTION
Calcium Sulfate occurs as a fine, white to slightly yellowwhitepowder. It is anhydrous or contains two molecules ofwater of hydration.
Function Nutrient; yeast food; dough conditioner; firmingagent; sequestrant.
REQUIREMENTS
Identification Dissolve about 200 mg of sample by warmingit with a mixture of 4 mL of 2.7 N hydrochloric acid and16 mL of water. A white precipitate forms when 5 mL of ammonium oxalate TS is added to 10 mL of the solution.Upon the addition of barium chloride TS to the remaining 10 mL, a white precipitate forms that is insoluble in hydrochloricand nitric acids.
Assay Not less than 98.0% of CaSO4, calculated on the dried basis.
Fluoride Not more than 0.003%.
Lead Not more than 2 mg/kg.
Loss on Drying Anhydrous: Not more than 1.5%; Dihydrate:Between 19.0% and 23.0%.
Selenium Not more than 0.003%.
TESTS
Assay Dissolve 250 mg of sample, accurately weighed, in 100 mL of water and 4 mL of 2.7 N hydrochloric acid, boilto effect solution, and cool. While stirring, preferably with a magnetic stirrer, add about 30 mL of0.05 M disodium EDTA from a 50-mL buret, then add 25 mL of 1 Nsodium hydroxide and 300 mg of hydroxy naphthol blue indicator, and continue the titration to a blue endpoint. Each milliliter of0.05 M
disodium EDTA is equivalent to 6.807 mg of CaSO4.
Fluoride Determine as directed under Fluoride Limit Test, Appendix IIIB, using1.67 gof sample, accurately weighed.
Lead Determine as directed in the APDC Extraction Method under Lead Limit Test, Appendix IIIB.
Loss on Drying Determine as directed under Loss on Drying, Appendix IIC, drying a sample to constant weight at 250°.
Selenium Determine as directed in Method II under Selenium Limit Test, Appendix IIIB, using a 200-mg sample.
Packaging and Storage Store in well-closed containers.
