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71640 Sigma-Aldrich

Sodium phosphate dibasic

puriss. p.a., ACS reagent, anhydrous, ≥99.0% (T)

Synonym: sec-Sodium phosphate, Disodium hydrogen phosphate, Disodium phosphate, Sodium hydrogenphosphate

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Properties

Related Categories Analytical Reagents, Analytical Reagents for General Use, Analytical/Chromatography, Essential Chemicals, Puriss p.a.,
grade   ACS reagent
InChI Key   BNIILDVGGAEEIG-UHFFFAOYSA-L
grade   puriss. p.a.
assay   ≥99.0% (T)
impurities   ≤0.001% total nitrogen (N)
loss   ≤0.2% loss on drying, 105 °C
pH   8.7-9.3 (25 °C, 50 mg/mL in H2O)
pKa (25 °C)   (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)
anion traces   chloride (Cl-): ≤10 mg/kg
  sulfate (SO42-): ≤50 mg/kg
cation traces   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: ≤50 mg/kg
  Mg: ≤5 mg/kg
  Mn: ≤5 mg/kg
  Ni: ≤5 mg/kg
  Pb: ≤5 mg/kg
  Zn: ≤5 mg/kg
  heavy metals: ≤0.001% (by ICP-OES)

Description

General description

Sodium phosphate is widely used buffer in molecular biology, biochemistry, and chromatographic studies. It exists in three forms: monobasic (NaH2PO4), dibasic (Na2HPO4), and tribasic (Na3PO4). Monobasic and dibasic forms in varying ratios are commonly used to compose the neutral sodium phosphate buffer solution.

Safety & Documentation

Safety Information

WGK Germany 
1
RTECS 
WC4500000

Documents

Certificate of Analysis

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Protocols & Articles

Articles

IC Separation of Chloride, Fluoride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate Ions on Metrohm Metrosep A Supp 16

From our library of Articles, Sigma-Aldrich presents IC Separation of Chloride, Fluoride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate Ions on Metrohm Metrosep A Supp 16
Keywords: Chromatography, High performance liquid chromatography

IC Separation of Chloride, Fluoride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate Ions on Metrohm Metrosep A Supp 5

From our library of Articles, Sigma-Aldrich presents IC Separation of Chloride, Fluoride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate Ions on Metrohm Metrosep A Supp 5
Keywords: Chromatography, High performance liquid chromatography

IC Separation of Chloride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate Ions on Metrohm Metrosep A Supp 10

From our library of Articles, Sigma-Aldrich presents IC Separation of Chloride, Nitrite, Bromide, Nitrate, Phosphate, and Sulfate Ions on Metrohm Metrosep A Supp 10
Keywords: Chromatography, High performance liquid chromatography

Peer-Reviewed Papers
15

References

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