Table 3 Changes in H2 concentration and pH of fluid samples through time
Olivine | Al2O3-5 % komatiite | Al2O3-10 % komatiite | ||||||
|---|---|---|---|---|---|---|---|---|
Time (h) | pH25 °C | H2 (mmol/kg) | Time (h) | pH25 °C | H2 (mmol/kg) | Time (h) | pH25 °C | H2 (mmol/kg) |
0 | 6.8 | 3.5 × 10− 4 | 0 | 7.0 | 7.1 × 10− 4 | 0 | 7.0 | n.d. |
24 | 10.3 | 1.5 | 24 | 7.5 | 3.9 × 10− 3 | 24 | 7.7 | 0.005 |
96 | 9.6 | 5.9 | 96 | 8.2 | 0.20 | 96 | 7.3 | 0.042 |
336 | 10.9 | 4.4 | 264 | 8.2 | 1.1 | 264 | 7.8 | 0.019 |
1512 | 10.8 | 61.2 | 648 | 7.7 | 1.9 | 648 | 8.5 | 0.018 |
1848 | 10.9 | 67.4 | 1176 | 8.1 | 20.0 | 1176 | 7.5 | 0.074 |
2688 | 10.5 | 61.8 | 2112 | 8.0 | 23.0 | 2112 | 7.7 | 0.052 |
2668 | 8.0 | 0.030 | ||||||