Table 1. Mean and one s.d. (in parenthesis) of the seawater carbonate buffer system measurements from all six experimental treatments (n=3).
| Treatment | Measured pH | Measured DIC concentration (μ) | Calculated pCO2 (p.p.m.) |
|---|---|---|---|
| B12-limited, 208 p.p.m. | 8.36 (0.03) | 1975 (27) | 208 (15) |
| B12-limited, 380 p.p.m. | 8.13 (0.02) | 2070 (20) | 380 (18) |
| B12-limited, 680 p.p.m. | 7.91 (0.02) | 2208 (13) | 680 (32) |
| B12-replete, 195 p.p.m. | 8.38 (0.02) | 1946 (16) | 195 (10) |
| B12-replete, 353 p.p.m. | 8.15 (0.02) | 2020 (8) | 353 (16) |
| B12-replete, 661 p.p.m. | 7.92 (0.01) | 2197 (12) | 661 (31) |
Abbreviations: DIC, dissolved inorganic carbon; pCO2, carbon dioxide partial pressure.
Seawater medium pCO2 levels were calculated from measurements of pH and DIC from the final sampling day, but were consistent at or near these values throughout most of the experiment after a brief initial equilibration period (data not shown).