... Ammonium Sulfate Fertilizer(We can compound any purity of each content you requested)Basic Properties: Colorless crystalline, Without ... standard: ITEMINDEXRESULTAppearanceWhite crystalPASSN content(dry basis),% ≥21.021.20Water content(H2O),% ≤0.200.20Free acid(H2SO4)content,% ≤0.030.03Fe ... % ≤0.0070.005As ,% ≤5E-05PASSHeavy metal(Pb)content,% ≤0.0050.005Water insolubles,% ≤0.010.01 AMMONIUM SULFATE ...