Check Item

standard value

Phosphoric acid (H3PO4) %

75.0-86.0.

Fluoride (as F) mg/kg

≤10

Readily oxidizable substance (H3PO3) %

≤0.012

Arsenic (As) mg/kg

≤0.5

Heavy metals (as Pb) mg/kg

≤5.0

Color status

Colorless transparent or slightly thick liquid

Sulfate (SO4)%

Chloride (C1) %

Iron(Fe)%