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purity criteria on food additives other than colours and sweeteners (Text with EEA relevance) (Codified version) (repealed) (c. 84)

ANNEX I

E 331 (i) MONOSODIUM CITRATE

Synonyms	Monosodium citrate Monobasic sodium citrate
Definition
Chemical name	Monosodium citrate
	Monosodium salt of 2-hydroxy-1,2,3-propanetricarboxylic acid
Chemical formula	(a) C6H7O7Na (anhydrous)
	(b) C6H7O7Na· H2O (monohydrate)
Molecular weight	(a) 214,11 (anhydrous)
	(b) 232,23 (monohydrate)
Assay	Content not less than 99 % on the anhydrous basis
Description	Crystalline white powder or colourless crystals
Identification
A. Positive tests for citrate and for sodium
Purity
Loss on drying	Determined by drying at 180 oC for four hours: anhydrous: not more than 1,0 %
	monohydrate: not more than 8,8 %
Oxalates	Not more than 100 mg/kg expressed as oxalic acid, after drying
pH of a 1 % aqueous solution	Between 3,5 and 3,8
Arsenic	Not more than 1 mg/kg
Lead	Not more than 1 mg/kg
Mercury	Not more than 1 mg/kg
Heavy metals (as Pb)	Not more than 5 mg/kg