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Items Standard Characters A Brown to Dark Brown Crystalline Powder; Odourless Identification Should Conform Chloride ≤2.0% Heavy Metal ≤20ppm Free Iron ≤ 0.2% Arsenic ≤ 0.0005% Molecular weight and distribution of molecular D (Mw/Mn)<1.8 Loss On Dry ≤5.0% Acute Toxicity Ld50≥500mg Fe Per Kg Of Body Weight Iron Absorption Should Conform