Assay ≥ 99.5 %
PH(50g/L，25℃) 5.0～8.0
Clarity test qualified
Water insoluble matter ≤ 0.005 %
Drying loss ≤ 0.5 %
Iodide(I) ≤ 0.002 %
Bromide(Br) ≤ 0.01 %
sulfate(SO4) ≤ 0.002 %
Total nitrogen(N) ≤ 0.001 %
phosphate(PO4) ≤ 0.001 %
magnesium(Mg) ≤ 0.002 %
potassium(K) ≤ 0.02 %
calcium(Ca) ≤ 0.005 %
iron(Fe) ≤ 0.0002 %
Arsenic(As) ≤ 0.00005 %
Barium(Ba) ≤ 0.001%
Heavy metals (as Pb) ≤ 0.0005 %
Hexacyanoferrate (II) acid salt [as Fe (CN) 6] ≤ 0.0001 %