Sigma-Aldrich Sodium phosphate monobasic dihydrate

Quality Level

200

assay

98-100.5% (calc. to the dried substance)

form

powder or crystals

quality

meets analytical specification of Ph. Eur., BP, USP, FCC, E 339

impurities

heavy metals (as Pb), complies
organic volatile impurities, complies
reducing matter, complies
related substances, complies
residual solvents, complies
≤0.2% water-insoluble matter

loss

21.5-24.0% loss on drying, 130 °C

pH

4.1-5.0 (20 °C, 1%)
4.2-4.5 (20 °C, 5%)

anion traces

chloride (Cl^-): ≤50 mg/kg
fluoride (F^-): ≤10 mg/kg
sulfate (SO₄^2-): ≤200 mg/kg

cation traces

Al:, in accordance
As: ≤1 mg/kg
Ca: ≤20 mg/kg
Ca:, in accordance
Cd: ≤1 mg/kg
Cu: ≤10 mg/kg
Fe: ≤5 mg/kg
Hg: ≤1 mg/kg
Mg: ≤20 mg/kg
Pb: ≤4 mg/kg
Zn: ≤10 mg/kg

suitability

complies for appearance of solution