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Relationship between propionate molar percentage and concentration of dissolved and gaseous H2. (A) propionate% = 18.6 (±0.78; P < 0.001) + 0.15 (±0.13; P = 0.24) H2 (aq); R2 = 0.062 (P = 0.24); (B) H2: propionate% = 18.4 (±1.01; P < 0.001) + 0.14 (±0.15; P = 0.36) H2 (g); R2 = 0.038 (P = 0.36).
