Calcium Carbonate USP Grade Specifications:
CaCO3 --- 100.09
Carbonic acid, calcium salt (1:1);
Calcium carbonate (1:1) --- CAS 471-34-1

DEFINITION
Calcium Carbonate, dried at 200C for 4 h, contains calcium equivalent to NLT 98.0% and NMT 100.5% of calcium carbonate (CaCO3).

IDENTIFICATION
A. Identification Tests - General, Calcium: The addition of acetic acid to it produces effervescence (presence of carbonate), and the resulting solution, after boiling, meets the requirements of the tests.

Acid-Insoluble Substances:
Sample: 5.0 g
Analysis: Mix the Sample with 10 mL of water, and add hydrochloric acid, dropwise, with agitation, until it ceases to cause effervescence, then add water to make the mixture measure 200 mL, and filter. Wash the insoluble residue with water until the last washing shows no chloride and ignite and weigh the residue.
Acceptance criteria: NMT 0.2%; the weight of the residue does not exceed 10 mg.
Arsenic: To pass the test. NMT 3 ppm
Barium: A platinum wire, dipped in the filtrate obtained in the test for Acid-Insoluble Substances and held in a nonluminous flame, does not impart a green color.
Iron: To pass the test by Ultraviolet-Visible Spectroscopy.
Lead:
Sample solution: 1.0 g in 5 mL of water
Analysis: To the Sample solution slowly add 8 mL of 3 N hydrochloric acid, evaporate on a steam bath to dryness, and dissolve the residue in 5 mL of water.
Acceptance criteria: NMT 3 ppm
Limit of Fluoride: To pass the test.
Acceptance criteria: NMT 50 ppm
Limit of Magnesium and Alkali Salts: To pass the test.
Acceptance criteria: NMT 1.0%; the weight of the residue is NMT 5 mg.
Mercury: To pass the test.
Acceptance criteria: NMT 0.5 ppm
Loss on Drying: Dry a sample at 200C for 4 h: it loses NMT 2.0% of its weight.

Calcium Carbonate BP Ph Eur Grade Specifications
CaCO3 --- 100
Action and use: Antacid.

TESTS
Solution S: Dissolve 5.0 g in 80 ml of dilute acetic acid R . When the effervescence ceases, boil for 2min. Allow to cool, dilute to 100 ml with dilute acetic acid R and filter, if necessary, through a sintered-glass filter.
Substances insoluble in acetic acid: Maximum 0.2 per cent.
Chlorides: Maximum 330 ppm.
Sulphates: Maximum 0.25 per cent.
Arsenic: Maximum 4 ppm, determined on 5 ml of solution S.
Barium: To 10 ml of solution S add 10 ml of calcium sulphate solution R . After at least 15 min, any opalescence in the solution is not more intense than that in a mixture of 10 ml of solution S and 10 ml of distilled water R.
Iron: Maximum 200 ppm.
Magnesium and alkali metals: Maximum 1.5 per cent.
Heavy metals: Maximum 20 ppm.

Calcium Carbonate FCC Food Grade Specifications
CaCO3 Formula weight 100.09
CAS: 471-34-1

Calcium Carbonate FCC Food Grade Specifications
CaCO3 Formula weight 100.09
CAS: 471-34-1

DESCRIPTION
Calcium Carbonate occurs as a fine, white or colorless, microcrystalline powder. It is stable in air, and it is practically insoluble in water and in alcohol. The presence of any ammonium salt or carbon dioxide increases its solubility in water, but the presence of any alkali hydroxide reduces the solubility.
Function: pH control agent; nutrient; dough conditioner; firming agent; yeast nutrient.

REQUIREMENTS
Identification: A sample dissolves, with effervescence, in 1 N acetic acid, in 2.7 N hydrochloric acid, and in 1.7 N nitric acid, and the resulting solutions, after boiling, give positive tests for Calcium.
Assay: Not less than 98.0% and not more than 100.5% of CaCO3 after drying.
Acid-Insoluble Substances: Not more than 0.2%.
Arsenic: Not more than 3 mg/kg.
Fluoride: Not more than 0.005%.
Lead: Not more than 3 mg/kg.
Loss on Drying: Not more than 2%.
Magnesium and Alkali Salts: Not more than 1%.

Calcium Carbonate Analytical Reagent Specifications
Calcium Carbonate
CaCO3
Formula Wt 100.09
CAS Number 471-34-1

Calcium Carbonate Analytical Reagent Specifications
Calcium Carbonate
CaCO3
Formula Wt 100.09
CAS Number 471-34-1

MAXIMUM ALLOWABLE
Insoluble in dilute hydrochloric acid: 0.01%
Ammonium hydroxide precipitate: 0.01%
Chloride (Cl): 0.001%
Sulfate (SO4): 0.0015%
Ammonium (NH4): 0.003%
Barium (Ba): 0.01%
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.003%
Magnesium (Mg): 0.02%
Potassium (K): 0.01%
Sodium (Na): 0.1%
Strontium (Sr): 0.1%