Table 1.
(upper) Conversion (%) of Pi(III) (50 mM) to PPi(III) via evaporation and low pressure heating (85 °C, 1–10 mbar) from deionized water as a function of starting pH; (lower) Conversion (%) of Pi(III) (100 mM) to PPi(III) via evaporation and low pressure heating (85 °C, 1–10 mbar) from standard mean ocean water as a function of time (samples analyzed in triplicate, with standard deviations in parentheses).
| pH | 4 Days | 5 Days | 6 Days |
|---|---|---|---|
| 4.0 | 24(2) | 24(4) | 30(1) |
| 4.5 | 12(0) | 14(1) | 15(1) |
| 5.0 | 8(1) | 10(1) | 17(0) |
| 5.5 | 12(0) | 14(1) | 15(1) |
| 5.8 | 4(1) | 5(0) | 6(0) |
| 6.0 | 0 | 0 | 0 |
| Time (h) | pH 3 | pH 4 | |
| 24 | 61(4) | 39(3) | |
| 48 | 61(3) | 16(1) | |
| 72 | 62(4) | 20(10) | |
| 336 | 35(5) | 38(0) | |