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Appearance White Crystalline Powder Assay (on dry matter) % 98.5-101.5 Clarity of Solution Clear, colorless Transmittance >=% 98.0 PH Value(1g/100ml in water) 5.4-6.1 Chloride(As Cl) =< % 0.05 Heavy Metals(As Pb) =< % 0.002 Lead (As Pb) =< % 0.001 Arsenic (As AS) =< % 0.00015 Sulfate(SO4) =< % 0.02 Ammonium( As NH4) =< % 0.01 Loss on drying =< % 0.5 Residue on ignition(as sulphate ash) =< % 0.1 Organic Volatile Impurities Meets the requirement