Tạo NO:
3FexOy + (12x – 2y)HNO3 → 3xFe(NO3)3 + (3x – 2y)NO + (6x – y)H2O
xFe(+2y/x) → xFe3+ + (3x – 2y)e……..3
N+5 + 3e → NO……………………………..(3x – 2y)
Tạo N2O:
8FexOy + (30x – 4y)HNO3 → 8xFe(NO3)3 + (3x – 2y)N2O + (15x – 2y)H2O
xFe(+2y/x) → xFe3+ + (3x – 2y)e……..8
2N+5 + 8e → N2O……………………………..(3x – 2y)