Disodium Phosphate Anhydrous

EP, USP (Tested for Endotoxin & Microbes)

CAS #:


Molecular Formula:



Dibasic sodium phosphate, Disodium orthophosphate, Disodium phosphoric acid, Soda phosphate

Molecular Weight:

141.96 g/mol


Sodium Phosphate Dibasic Anhydrous is typically used as a component in the preparation of phosphate-based buffers. It is also used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.

Characters Unit Specification
Appearance white or almost white, crystalline powder
Assay % 98,0 – 100,5
Identification complies
Insoluble substances % max. 0,4
Chloride ppm max. 200 (Ph. Eur)
% max. 0,06 (USP)
Sulphate ppm max. 500 (Ph. Eur.)
% max. 0,2 (USP)
Arsenic ppm max. 2(Ph., Eur)
% max. 16(USP)
Iron ppm max. 20
Heavy metals ppm max. 10
Reducing Substances complies
Loss on drying % max. 1,0 (Ph. Eur)
% max. 5,0 (USP)
Total aerobic microbial count cfu/g max. 100
Total yeasts and moulds count cfu/g max. 50
E.coli cfu/g absent in 1g
Pseudomonas aeruginosa cfu/g absent in 1g
Staphylococcus aureus cfu/g absent in 1g
Salmonella cfu/g absent in 25g
Bacterial endotoxine IU/g max. 10

Shelf Life/Retest Date: Di-Sodium Phosphate Anhydrous can be kept for at least 2 years if stored under recommended conditions.

Storage/Shipping Conditions:

  • Keep container tightly closed in a dry and well-ventilated place.
  • Store at room temperature in the original container.
  • Store away from incompatible materials.
  • Hygroscopic.

Pack Sizes: 5 Kg

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