4.120167
Tris (Hydroxymethyl) Aminomethane
primary standard, ACS-ISO
NH2C(CH2OH)3 M.= 121.14
CAS No. 77-86-1
Assay (Perchl. Ac.) (after drying at 105°C) 99.95 ~ 100.05%
Identity (IR) passes test
pH (sol. 0.05 mol/l) 10.2 ~ 10.6
MAXIMUM LIMIT OF IMPURITIES
ABS (at λ 290 nm 40% sol. in water) 0.2
Insoluble matter in H2O 0.005%
Residue on ignition (as SO4) 0.01%
Chloride (Cl) 0.0005%
Heavy metals (as Pb) 0.0005%
As 0.00005% Cu 0.0002% Na 0.001%
Ca 0.001% Fe 0.0005% Ni 0.0005%
Cd 0.0001% K 0.001% Pb 0.0002%
Co 0.0001% Mg 0.001% Zn 0.0002%
Cr 0.0001%
