无水乙酸钠，(Reag. Ph. Eur.) ACS，≥99.0%

4.120166
Sodium Carbonate anhydrous
primary standard, ACS-ISO
Na2CO3          M.= 105.99
CAS No.         497-19-8    

Assay (Acidim.) (after dried at 120°C. 2 h)      99.95 ~ 100.05% 
MAXIMUM LIMIT OF IMPURITIES 
Insoluble matter in H2O                           0.005%
Reducing substances I2                            0.005%
Nitrogen compounds (as N)                         0.001%
Chloride (Cl)                   0.001%          Phosphate (PO4)           0.001%
Sulphur compounds (as SO4)      0.003%          Silicate (as SiO2)        0.005%
Heavy metals (as Pb)            0.0005%

Al         0.001%          Cu         0.0005%          Mg         0.002%
As         0.0001%         Fe         0.0005%          Ni         0.0005%
Ca         0.005%          K          0.005%           Pb         0.0005%