grade
SigmaUltra
assay
≥99.0% (titration)
total impurities
Insoluble matter, passes filter test
ign. residue (900°C)
≤0.2% (as SO4)
loss
≤0.2% loss on drying, 110°C
pH
3.5-5.0 (20 °C, 0.5 M in H2O)
useful pH range
7.0 - 9.0
pKa (25 °C)
8.1
solubility
H2O: 0.5 M at 20 °C, clear, colorless
anion traces
sulfate (SO42-): ≤0.005%
cation traces
Al: ≤0.0005%
As: ≤0.0001%
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%
Na: ≤0.005%
Ni: ≤0.0005%
Pb: ≤0.0005%
Sr: ≤0.0005%
Zn: ≤0.0005%
abs.
A0.5M/260, H2O ≤0.015
A0.5M/280, H2O ≤0.010
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