Table 1. Theoretical Calcultion of Iodine Fractionation Affected by Increasing Temperature Using Various Protocolsa.
| fractionation |
||||||||
|---|---|---|---|---|---|---|---|---|
| protocol | vol. of bottles (mL) | vol of R2 (mL) | [I–] in R2 (M) | final volume (mL) | temp (°C) | (I3–)% | (I2)% | change of (I3–)% per °C |
| Shibala | 60 | 0.5 | 4 | 60.5 | 20 | 96.22% | 3.78% | |
| 25 | 95.82% | 4.18% | –0.09% | |||||
| 30 | 95.39% | 4.61% | ||||||
| 35 | 94.94% | 5.06% | ||||||
| Labasque | 146 | 0.9 | 4 | 146.9 | 20 | 94.89% | 5.11% | |
| 25 | 94.36% | 5.64% | –0.12% | |||||
| 30 | 93.79% | 6.21% | ||||||
| 35 | 93.19% | 6.81% | ||||||
| APHA | 300 | 1 | 0.87 | 301 | 20 | 56.60% | 43.40% | |
| 25 | 54.17% | 45.83% | –0.87% | |||||
| 30 | 51.82% | 48.18% | ||||||
| 35 | 49.50% | 50.50% | ||||||
| Grasshoff | 50 | 0.5 | 3.61 | 50.5 | 20 | 96.51% | 3.49% | |
| 25 | 96.13% | 3.87% | –0.08% | |||||
| 30 | 95.74% | 4.26% | ||||||
| 35 | 95.32% | 4.68% | ||||||
a
Calculations were based on an assumed oxygen concentration of 250 μM.