Index Name

Index Value

Actual Value

Nitrogen (N) content (based on dry basis),%  ≥

21.0

21.2

Water content (H₂O),%                  ≤

1.0

0.4

Free acid (H₂SO₄),%                    ≤

0.05

0.024

Iron (Fe),%                            ≤

0.007

0.0031

Arsenic (As),%                         ≤

0.00005

0.000012

Heavy metal (based on Pb),%             ≤

0.005

0.0027

Insoluble substance in water,%            ≤

0.05

0.017