Assay (C6H8Na3O7·2H2O) (by non-aqueous titration) 99.0 - 101.0 %
pH of 5% Solution at 25°C 7.0 - 9.0
Insoluble Matter ≤0.005 %
Chloride (Cl) ≤ 0.003 %
Sulfate (SO4) ≤ 0.005 %
Ammonia (as NH3) ≤ 0.003 %
Calcium (Ca) ≤ 0.005 %
Heavy Metals (as Pb) ≤ 5 ppm
Iron (Fe) ≤5 ppm