Sodium Dihydrogen Phosphate Dihydrate

EP, USP + LEC + Microbiological requirements

CAS #:


Molecular Formula:

H2NaO4P . 2H2O


Sodium orthophosphate, Sodium biphosphate, Sodium phosphate monobasic

Molecular Weight:

156.02 g/mol


Sodium Phosphate, Monobasic, Dihydrate is one of the sodium salts derived from phosphoric acid. Highly hygroscopic and water soluble it comes in the form of a white powder. In an aqueous solution it is basic, with a pH value between 8.0 and 11.0. It is added in animal feed, toothpaste, and evaporated milk. It is used as a thickening agent and emulsifier.

Characters Unit Specification
Identity A (EP,BP) requirements
Identity B (EP,BP) requirements
Identity C (EP,BP) requirements
Identity D (EP,BP) requirements
Identity A (USP) requirements
Identity B (USP) requirements
Appearance of solution (EP,BP) Correlates to test
Al,Ca and related elements USP Correlates to test
Reducing substances (EP,BP) Correlates to test
Assay (EP,BP) % 98,0-100,5
Assay (USP) % 98,0-103,5
Loss on drying (EP,BP) % 11,5-14,5
Water (USP) % 10,0-15,0
Ph (5%) 4,2-4,5
Insoluble matter in water (USP) % <=0,20
Heavy metals (as Pb) mg/kg <=10
Arsenic (USP) mg/kg <=8
Arsenic (EP,BP) mg/kg <=2
Iron (EP,BP) mg/kg <=10
Sulphates (USP) mg/kg <=1500
Sulfates (EP,BP) mg/kg <=300
Chlorides (USP) mg/kg <=140
Chlorides (EP,BP) mg/kg <=200
Bacterial endotoxine lU/g <=5
TAMC 30oC (Total aerobic microbial count) cfu/g <=50
TYMC cfu/g <=10
Escherichia coli cfu/g
Staphylococcus aureus cfu/g
Pseudomonas aeruginosa cfu/g
Salmonella cfu/10g

Shelf Life/Retest Date: Sodium Dihydrogen Phosphate Dihydrate CAS NO. 13472-35-0 raw material can be kept for at least 2 years if stored in a cool and dry place.

Storage/Shipping Conditions:

  • Store protected from solvents.
  • Requirements for storage rooms and vessels.
  • Keep tightly closed.
  • Keep in a dry place.
  • Storage temperature recommended: < 25°C

Pack Sizes: 100 gm

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