grade
SigmaUltra
assay
≥98.0% (titration)
total impurities
Insoluble matter, passes filter test
≤3% Free alkali (as NaOH)
solubility
H2O: 0.5 M at 20 °C, clear, colorless
anion traces
chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.005%
cation traces
Al: ≤0.0005%
Ba: ≤0.0005%
Bi: ≤0.0005%
Ca: ≤0.001%
Cd: ≤0.0005%
Co: ≤0.0005%
Cr: ≤0.0005%
Cu: ≤0.0005%
Fe: ≤0.0005%
K: ≤0.005%
Li: ≤0.0005%
Mg: ≤0.0005%
Mn: ≤0.0005%
Mo: ≤0.0005%
Ni: ≤0.0005%
Pb: ≤0.0005%
Sr: ≤0.0005%
Zn: ≤0.0005%
abs.
A0.5M/260, H2O ≤0.035
A0.5M/280, H2O ≤0.023
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