Item

Standard

Result

Appearance

White crystal

Main content ((NH₄H₂PO₄)        %  ≥

98

99.1

Phosphorus pentoxide P₂O₅       %   ≥

60.5

61.1

Nitrogen, as N                   %   ≥

11.8

12.13

Water insoluble matters           %  ≤

0.3

         0.10

Moisture                        %  ≤

0.3

0.10

Sulfate (SO4)                    %  ≤

1.2

0.05

Cadmium(Cd)/%

————

0.00006

Lead Pb/%

————

0.001

Chromium (Cr)/%

————

0.001

Mercury(Hg)/%

————

0.00001

PH of 1% solution

4.0-5.0

4.60

Arsenic as As

———–

0.0005