Figure 4From: Abiotic ammonium formation in the presence of Ni-Fe metals and alloys and its implications for the Hadean nitrogen cycleNH4+ formation from N2 in the presence of Ni, Fe metals and alloys at 200°C. The dashed lines correspond to the Ar blank. The concentrations of KCl in the experiments were 459 μmol.kg-1 in A, B and 476 μmol.kg-1 in C, D. Results are normalized to 1 m2 of surface area.Back to article page