Tetrasodium pyrophosphate TSPP Sodium Pyrophosphate

Sodium Pyrophosphate (Tetrasodium Pyrophosphate)

Other name : Tetrasodium Diphosphate; Tetras odium Pyrophosphate

Anhydrous :

Molecular Formula : Na4P2O7

Molecular Weight : 265.90

CAS: [7722-88-5]



Decahydrate :

Molecular Formula : Na4P2O7·10H2O

Molecular Weight : 446.06

INS: 450(iii)

CAS: [13472-36-1]



DESCRIPTION

Sodium Pyrophosphate occurs as colorless or white crystals or as a white, crystalline or granular powder. It is anhydrous or contains 10 molecules of water of hydration. The decahydrate

effloresces slightly in dry air. It is soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is about 10.

Function

Emulsifier; buffer; nutrient; sequestrant; texturizer.

REQUIREMENTS

Identification

A 1:20 aqueous solution gives positive tests for Sodium, Appendix IIIA.Dissolve 100 mg of sample in 100 mL of 1.7 N nitric acid. Add 0.5 mL of this solution to 30 mL of quimociac TS. A yellow precipitate does not form. Heat the remaining portion of the sample solution for 10 min at 95°, and then add 0.5 mL of the solution to 30 mL of quimociac TS. A yellow
precipitate forms immediately.

Assay

Not less than 95.0% and not more than 100.5% of Na4P2O7, calculated on the ignited basis.

Arsenic

Not more than 3 mg/kg.

Fluoride

Not more than 0.005%.

Insoluble Substances

Not more than 0.2%.

Lead

Not more than 4 mg/kg.

Loss on Ignition

Anhydrous: Not more than 0.5%; Decahydrate: Between 38.0% and 42.0%.

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Product Categories : Phosphate > Sodium Phosphate