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Lithium Citrate

Lithium Citrate USP BP Ph Eur Supplier, Manufacturer's Representative, CAS Number 6080-58-6 or 919-16-4

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DESCRIPTION

Lithium Citrate USP Grade:
C6H5Li3O7-4H2O --- 281.98
C6H5Li3O7 --- 209.93

1,2,3-Propanetricarboxylic acid, 2-hydroxy-trilithium salt tetrahydrate;
Trilithium citrate tetrahydrate ---CAS Number 6080-58-6.
Anhydrous----CAS Number 919-16-4
.

DEFINITION
Lithium Citrate contains NLT 98.0% and NMT 102.0% of lithium citrate (C6H5Li3O7), calculated on the anhydrous basis.

IDENTIFICATION
A. The emission intensity at 671 nm of the Sample solution corresponds to that of the Standard solution, as obtained in the Assay.
B. Identification Tests - General, Citrate: Meets the requirement

ASSAY
To pass the test.
Acceptance criteria: 98.0%–102.0% on the anhydrous basis
Carbonate:
Analysis: Add 0.5 g of Lithium Citrate to 5 mL of 6 N acetic acid.
Acceptance criteria: NMT a slight effervescence is produced.
pH:
Sample solution: 50-mg/mL solution of Lithium Citrate in water
Acceptance criteria: 7.0–10.0
Water Determination:
Analysis: Dry a sample at 150C for 3 h.
Acceptance criteria: 24.0%–28.0%.

Lithium Citrate BP Ph Eur
Formula: C6H5Li3O7-4H2O
Weight: 282.0
CAS Number: 6080-58-6

DEFINITION
Trilithium 2-hydroxypropane-1,2,3-tricarboxylate tetrahydrate.
Content: 98.0 per cent to 102.0 per cent (anhydrous substance).

CHARACTERS
Appearance: White or almost white, fine crystalline powder.
Solubility: Freely soluble in water, slightly soluble in ethanol (96 per cent).

IDENTIFICATION
A. When moistened with hydrochloric acid, it gives a red colour to a non-luminous flame.
B. Dilute 3 ml of solution S (see Tests) to 10 ml with water. Add 3 ml of potassium ferriperiodate solution. A white or yellowish-white precipitate is formed.
C. To 1 ml of solution S add 4 ml of water. The solution gives the reaction of citrates.

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Acidity or alkalinity: To 10 ml of solution S add 0.1 ml of PhPh solution. Not more than 0.2 ml of 0.1 M hydrochloric acid or 0.1 M sodium hydroxide is required to change the colour of the indicator.
Readily carbonisable substances: To 0.20 g of the powdered substance to be examined add 10 ml of sulphuric acid and heat in a water-bath at 90 ± 1C for 60 min. Cool rapidly. The solution is not more intensely coloured than reference.
Chlorides: Maximum 100 ppm.
Oxalates: Maximum 300 ppm, calculated as anhydrous oxalate ion.
Sulphates: Maximum 500 ppm.
Heavy metals: Maximum 10 ppm.
Water: 24.0 per cent to 27.0 per cent, determined on 0.100 g.

ASSAY:
Dissolve 80.0 mg in 50 ml of anhydrous acetic acid, heating to about 50C. Allow to cool. Titrate with 0.1 M perchloric acid, using 0.25 ml of naphtholbenzein solution as indicator, until the colour changes from yellow to green.
1 ml of 0.1 M perchloric acid is equivalent to 7.00 mg of C6H5Li3O7.


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