| 分子式 | |
| 其他事项 | 4.120167Tris (Hydroxymethyl) Aminomethaneprimary standard, ACS-ISONH2C(CH2OH)3 M.= 121.14CAS No. 77-86-1 Assay (Perchl. Ac.) (after drying at 105°C) 99.95 ~ 100.05%Identity (IR) passes testpH (sol. 0.05 mol/l) 10.2 ~ 10.6MAXIMUM LIMIT OF IMPURITIES ABS (at λ 290 nm 40% sol. in water) 0.2Insoluble 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% |
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