grade
SigmaUltra
assay
>99.5% (titration)
total impurities
Insoluble matter, passes filter test
ign. residue (900 °C)
<0.05%
loss
<0.05% loss on drying, 110 °C
pH
4.5-6.0 (20 °C, 1 M in H2O)
useful pH range
7.5 - 8.9
pKa
8.2
solubility
H2O: 1 M at 20 °C, clear, colorless
anion traces
chloride (Cl-): <0.005%
sulfate (SO42-): <0.005%
cation traces
Al: <0.0005%
As: <0.00001%
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%
NH4+: <0.02%
Na: <0.005%
Ni: <0.0005%
Pb: <0.0005%
Sr: <0.0005%
Zn: <0.0005%
abs.
A1M/260, H2O <0.075
A1M/280, H2O <0.072
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