... Colority≤20304020304020 Content(H3PO4),%≥85858575757575.0-86.0% Chloride(Cl),%≤0.00050.00050.0010.00050.00050.001 Sulphates(SO4),%≤0.0030.0050.010.0030.0050 ... .01 Iron(Fe),%≤0.0020.0020.0050.0020.0020 ... 00005 Arsenic(Pb),%≤0.0010.0010.050.0010.0010.050.0005 Heavy metal(F),%≤ 0.001 Easily oxidated matter (H3P03),%≤ 0.012 Phosphoric ...