Nitrogen fixation N N 940 kJ/mol N 2 N 2 + + e - 1500 kJ/mol 1.Chemical: - Haber-Bosch: N 2 + 3 H 2 - Mild conditions:- large amount of red. agent - non-aqueous conditions 500°C 250 atm 2 NH 3
Nitrogen fixation 2.Biological fixation PROKARYIOTS other living syst. Higher animals (humans)
Biological Nitrogen Comes from N 2 10 11 kg of N 2 fixed annually
*Nitrogen Fixation and Nitrogenase *The fixed nitrogen (NH 3, NO 2 -, and NO 3 - ) is consumed by plants and then eaten by animals. *Animal waste and dead plants are attacked by bacteria that break down the fixed nitrogen and produce N 2 gas for the atmosphere.