tetra-Sodium Pyrophosphate 10-hydrate for analysis

tetra-Sodium Pyrophosphate 10-hydrate for analysis
Content: 25 KGM
Physical Description:
solid
Quality Name: for analysis
Specification: Minimum assay (Acidim.): 99.0%
pH of 5% solution: 9.5-10.7

?maximum limit of impurities:
Insoluble matter in H2O: 0.01 %
Chloride (Cl): 0.005%
Sulfate (SO4): 0.005%
Carbonate: passes test
Nitrate (NO3): 0.003%
As: 0.0003 %
Ca: 0.01 %
Cu: 0.0005 %
Fe: 0.0005 %
Mg: 0.01 %
Ni: 0.0005 %
Pb: 0.0005 %