white crystals or crystalline powder, no smell, taste sour, aqueous solution PH value of 4.1 to 5.6, the melting point of 300 JP8ItemIndexAssay %98.5~101.0Chloride (as Cl ),% ,% ≤0.011Loss on dry, %≤0.2Readily carbonizable substancecolorless solutionSulfate (as SO4),% ≤0.014ClarityclearHeavy metals (as Pb),% ≤0.001As (as As2O3),% ≤0.0001Residue on ignition, %≤0.1Ammonium salts (as NH4), %≤0.02 ...