Ammonium sodium phosphate dibasic tetrahydrate

puriss. p.a., ≥99.0% (NT)

sec-Sodium ammonium phosphate, Sodium ammonium hydrogen phosphate, Ammonium sodium hydrogen phosphate
Linear Formula:
NaNH4HPO4 · 4H2O
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:


puriss. p.a.


≥99.0% (NT)


water: soluble(lit.)

anion traces

chloride (Cl-): ≤10 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

Ag: ≤5 mg/kg
Al: ≤5 mg/kg
As: ≤0.5 mg/kg
Ba: ≤5 mg/kg
Bi: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤10 mg/kg
Li: ≤5 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Mo: ≤5 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Sr: ≤5 mg/kg
Tl: ≤10 mg/kg
Zn: ≤5 mg/kg

SMILES string




InChI key


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General description

Ammonium sodium phosphate dibasic tetrahydrate (Ammonium sodium hydrogen phosphate) is a colorless ammonium salt. On heating, it undergoes decomposition to afford sodium polyphosphate.


Ammonium sodium phosphate dibasic tetrahydrate (Sodium ammonium phosphate tetrahydrate) may be used in the following studies:
  • To compose the growth medium during the biocatalytic synthesis of 4-fluorocatechol.
  • Preparation of microcosmic salt beads, which are used in qualitative analysis.

Other Notes

Reagent for the decomposition of barium sulfate in phosphate salt beads


NONH for all modes of transport

WGK Germany


Certificate of Analysis
Certificate of Origin
Z. Sulcek et al.
Methods of Decomposition in Inorganic Analysis (1989)
12.7 The Biocatalytic Synthesis of 4-Fluorocatechol from Fluorobenzene.
Whittall J and Sutton P.
Practical Methods for Biocatalysis and Biotransformations, 379-379 (2009)
R. Bock
Aufschlussmethoden der anorg. & org. Chemie (1972)
Eagleson M.
Concise Encyclopedia Chemistry, 67-67 (1994)
Caryn Wadler et al.
Analytical biochemistry, 368(1), 17-23 (2007-07-03)
A new approach to determine in vivo pools of coenzyme A (CoA) and short chain acyl-CoA thioesters is reported. The metabolites released by extraction with trichloroacetic acid are recovered and quantitatively dephosphorylated by treatment with shrimp alkaline phosphatase. Following phosphatase...

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