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Citric Acid

Citric Acid Crystals & Liquid Solution Suppliers Manufacturer's Representative, USP BP FCC Food Grade ACS Reagent

CAS number: 77-92-9 for anhydrous and 5949-29-1 for monohydrate
Molecular Weight: 192.13 or 210.14
Chemical Formula: C6 H8 O7 or C6H8O7.H2O

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Citric Acid

Synonyms: citric acid hydrate, citric acid, 2-hydroxy-1,2,3-propanetricarboxylic acid monohydrate Beta-Hydroxytricarboxylic Acid.
CAS Number: 77-92-9 for anhydrous and 5949-29-1 for monohydrate
EC# (EINECS): 201-069-1
FEMA Number: 2306
Molecular Weight: 192.13
Molecular Formula: C6 H8 O7 or C6H8O7.H2O
Category: acidulants, sequestrants, antioxidant synergists, flavoring agents
E-Number: E330

Specifications of Citric Acid Anhydrous
Item Specification
Appearance Colorless or white crystal
Identification and solubility Pass the test
Clarity and color of solution 20% Water solution clarity
Assay 99.5-101.0%
Humidity ≤0.5%
Sulfated Ash ≤0.1%
Sulfate ≤150ppm
Oxalates ≤350ppm
Calcium ≤200ppm
Heavy metal ≤10ppm
Iron ≤50ppm
Chloride ≤50ppm
Readily carbureted substance Standard color
Barium Pass the test
Bacterial endotoxin ≤0.5IU/mg
Aluminium ≤0.2ppm
Arsenic ≤1ppm
Mercury ≤1ppm
Lead ≤1ppm
Organic volatile impurity Pass the test
Tridodecylamine ≤0.1ppm
U.V. Radiation absorption value Pass the test
-------- Mesh size: 10-30mesh as required by the buyer.

Citric acid is a weak organic acid. It is a natural preservative/conservative and is also used to add an acidic, or sour, taste to foods and soft drinks. Citric acid is a commodity chemical, and more than a million tones are produced every year by fermentation. It is used mainly as an acidifier, as a flavoring, and as a chelating agent.

As a food additive, citric acid is used as a flavoring and preservative in food and beverages, especially soft drinks. Within the European Union it is denoted by E number E330. Citric acid is found in a number of products like food, beverages, cleaners cosmetics etc. Citric acid may be used as the main ripening agent in the first steps of making mozzarella cheese. It is used as a successful alternative to nitric acid in passivation of stainless steel. Citric acid can be used to slow setting of Portland cement. It can delay setting time substantially.
And … many more applications.

Citric Acid Monohydrate USP
Citric Acid USP Monohydrate
C6H8O7·H2O 210.14
1,2,3-Propanetricarboxylic acid, 2-hydroxy-, monohydrate.

Citric Acid Monohydrate contains one molecule of water of hydration. It contains not less than 99.5 percent and not more than 100.5 percent of C6H8O7, calculated on the anhydrous basis.

Labeling: Where it is intended for use in dialysis solutions, it is so labeled. Where Citric Acid Monohydrate must be subjected to further processing during the preparation of injectable dosage forms to ensure acceptable levels of bacterial endotoxins, it is so labeled. Where Citric Acid Monohydrate is sterile, it is so labeled.
Identification, Infrared Absorption 197K: Dry the substance to be examined at 105 for 2 hours.
Bacterial endotoxins: The level of bacterial endotoxins is such that the requirement in the relevant dosage form monograph (s) in which Citric Acid Monohydrate is used can be met.
Sterility: Where the label states that Citric Acid Monohydrate is sterile, it meets the requirements for Sterility, in the relevant dosage form monograph(s) in which Citric Acid Monohydrate is used.
Water: between 7.5% and 9.0%.
Residue on ignition: Not more than 0.1%, determined on 1.0 g.
Readily carbonizable substances: To pass the test
Sulfate: 0.015%.
Heavy metals: 0.001%.
Limit of oxalic acid: 0.036%.

Citric Acid Monohydrate BP
C6H8O7-H2O -- 210 -- CAS Number 5949-29-1
Citric Acid BP Monohydrate

2-Hydroxypropane-1,2,3-tricarboxylic acid monohydrate.
Content: 99.5 per cent to 100.5 per cent (anhydrous substance).

Appearance: White or almost white, crystalline powder, colourless crystals or granules, efflorescent.
Solubility: Very soluble in water, freely soluble in ethanol (96 per cent).

First identification B, E.
Second identification A, C, D, E.
A. Dissolve 1 g in 10 ml of water. The solution is strongly acidic.
B. Infrared absorption spectrophotometry.
C. Add about 5 mg to a mixture of 1 ml of acetic anhydride and 3 ml of pyridine. A red colour develops.
D. Dissolve 0.5 g in 5 ml of water, neutralize using 1 M sodium hydroxide (about 7 ml), add 10 ml of calcium chloride solution R and heat to boiling. A white precipitate is formed.
E. Water (see Tests).

Appearance of solution: The solution is clear and not more intensely coloured than reference.
Dissolve 2.0 g in water and dilute to 10 ml with the same solvent.
Readily carbonizable substances: To 1.0 g in a cleaned test tube add 10 ml of sulphuric acid and immediately heat the mixture in a water-bath at 90 ± 1 °C for 60 min. Cool rapidly immediately afterwards. The solution is not more intensely coloured than a mixture of 1 ml of red primary solution and 9 ml of yellow primary solution.
Oxalic acid: Maximum 360 ppm, calculated as anhydrous oxalic acid.
Sulphates: Maximum 150 ppm.
Aluminium: Maximum 0.2 ppm, if intended for use in the manufacture of dialysis solutions.
Heavy metals: Maximum 10 ppm.
Water: 7.5 per cent to 9.0 per cent, determined on 0.500 g.
Sulphated ash: Maximum 0.1 per cent, determined on 1.0 g.
Bacterial endotoxins: Less than 0.5 IU/mg, if intended for use in the manufacture of parenteral dosage forms without a further appropriate procedure for the removal of bacterial endotoxins.

Citric Acid FCC Food Grade
C6H8O7 Formula wt, anhydrous 192.13
C6H8O7·H2O Formula wt, monohydrate 210.14
INS: 330 CAS: anhydrous [CAS Number 77-92-9]
CAS: monohydrate [CAS Number 5949-29-1]

Citric Acid occurs as colorless, translucent crystals or as a white, granular to fine, crystalline powder. It is anhydrous or contains one molecule of water of hydration. The hydrous form is efflorescent in dry air. It is odorless and has a strongly acid taste. One gram is soluble in about 0.5 mL of water, in about 2 mL of alcohol, and in about 30 mL of ether.
Function: Sequestrant; dispersing agent; acidifier; flavoring agent.

Labeling: Indicate whether it is anhydrous or hydrous.
Identification: A 1:10 aqueous solution gives positive tests for Citrate.
Assay: Not less than 99.5% and not more than 100.5% of C6H8O7, calculated on the anhydrous basis.
Lead: Not more than 0.5 mg/kg.
Oxalate: Passes test.
Readily Carbonizable: Substances Passes test.
Residue on Ignition: Not more than 0.05%.
Tridodecylamine (for solvent-extracted Citric Acid only): Not more than 0.1 mg/kg.
Water: Anhydrous: Not more than 0.5%; Monohydrate: Not more than 8.8%.

Citric Acid ACS Analytical Reagent
Citric Acid, Anhydrous, and Citric Acid, Monohydrate
2-Hydroxy-1,2,3-propanetricarboxylic Acid
HOCOCH2C(OH)(COOH)CH2COOH; Formula Weight. 192.13
HOCOCH2C(OH)(COOH)CH2COOH-H2O; Formula Weight. 210.14
CAS Number 77-92-9 (Anhydrous), 5949-29-1 (Monohydrate)

Assay: 99.5% C6H8O7; 99.0-102.0% C6H8O7-H2O min

Insoluble matter: 0.005%
Residue after ignition: 0.02%
Chloride (Cl): 0.001%
Oxalate (C2O4): Passes test
Phosphate (PO4): 0.001%
Sulfate (SO4): 0.002%
Iron (Fe): 3 ppm
Lead (Pb): 2 ppm
Substances carbonizable by hot sulfuric acid: Passes test


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