Sodium Thiosulfate anhydrous (Reag. Ph. Eur.) for analysis

Sodium Thiosulfate anhydrous (Reag. Ph. Eur.) for analysis
Content: 5 KGM
Physical Description:
solid
Quality Name: for analysis
Specification: Minimum assay (Iodom.): 99.0%
pH of 5% solution: 6.0-8.4

?maximum limit of impurities:
Insoluble matter in H2O: 0.01 %
Loss on drying at 105°C: 1%
Chloride (Cl): 0.05%
Sulfide (S): 0.0005 %
Sulfate and sulfite (as SO4): 0.5%
Ca: 0.004 %
Cd: 0.001 %
Co: 0.001 %
Cu: 0.001 %
Fe: 0.001 %
K: 0.01 %
Ni: 0.001 %
Pb: 0.001 %
Zn: 0.001 %