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Commission Directive 2008/84/EC (repealed)Show full title

Commission Directive 2008/84/EC of 27 August 2008 laying down specific purity criteria on food additives other than colours and sweeteners (Text with EEA relevance) (Codified version) (repealed)

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E 450 (iii) TETRASODIUM DIPHOSPHATE

SynonymsTetrasodium pyrophosphate
Sodium pyrophosphate
Definition
Chemical nameTetrasodium diphosphate
Einecs231-767-1
Chemical formulaAnhydrous: Na4P2O7
Decahydrate: Na4P2O7 · 10H2O
Molecular weightAnhydrous: 265,94
Decahydrate: 446,09
AssayContent not less than 95 % of Na4P2O7 on the ignited basis
P2O5 contentNot less than 52,5 % and not more than 54,0 %
DescriptionColourless or white crystals, or a white crystalline or granular powder. The decahydrate effloresces slightly in dry air
Identification
A.Positive tests for sodium and for phosphate
B.Solubility
Soluble in water. Insoluble in ethanol
C.pH of a 1 % solution
Between 9,8 and 10,8
Purity
Loss on ignitionNot more than 0,5 % for the anhydrous salt, not less than 38 % and not more than 42 % for the decahydrate, in both cases determined after drying at 105 oC for four hours, followed by ignition at 550 oC for 30 minutes
Water-insoluble matterNot more than 0,2 %
FluorideNot more than 10 mg/kg (expressed as fluorine)
ArsenicNot more than 3 mg/kg
CadmiumNot more than 1 mg/kg
LeadNot more than 4 mg/kg
MercuryNot more than 1 mg/kg

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