Sigma-Aldrich Sodium phosphate dibasic dodecahydrate

agency

meets analytical specifications of BP
meets analytical specifications of Ph. Eur.

Quality Level

200

assay

98.5-102.5% (T)

form

crystals

quality

meets analytical specification of Ph. Eur., BP, E339

impurities

reducing matter, complies
residual solvents, complies
≤0.001% heavy metals (as Pb)
≤1.0% NaH₂PO₄
57-61% water (Karl Fischer)

loss

57-61% loss on drying

pH

8.4-9.6 (20 °C, 1%)

anion traces

chloride (Cl^-): ≤10 mg/kg
fluoride (F^-): ≤10 mg/kg
sulfate (SO₄^2-): ≤100 mg/kg

cation traces

As: ≤1 mg/kg
Cd: ≤1 mg/kg
Cu: ≤20 mg/kg
Fe: ≤10 mg/kg
Hg: ≤1 mg/kg
K: ≤50 mg/kg
Pb: ≤4 mg/kg
Zn: ≤10 mg/kg