Test items standard indicators Assay (452.2 meter)% ≥ 99.0 Chloride (based on Cl)% ≤ 0.01 Sulfate (SO4 dollars)% ≤ 0.05 Heavy metals (as Pb)% ≤ 0.001 Iron (as Fe)% ≤ 0.001 Loss on drying (105 ± 2 ℃)% ≤ 0.2 Chelation value: mgCaCO3 / g ≥ 339 PH value 2.8-3.0 NTA% Appearance: white crystalline powder |