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Table 8

Thermodynamic conditions considered and calculated H2 solubility in Mid-Atlantic ridge hydrothermal systems. H2 concentrations measured in the corresponding hydrothermal fluids are also indicated.

Hydrothermal field / seawater Depth (m) Temperature (°C) Considered pressure (bar) H2 solubility (mol/kgH2O) Measured H2 concentration (mol/kgH2O)
Ashadze II 3263 296 320 0.533 0.026
Logatchev II 2700 320 270 0.672 0.011
Logatchev I 3000 350 300 0.616 0.011
Lost City 780 94 78 0.048 0.0078
Seawater 300 2 300 0.199 4 × 10−7

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