Table 4.
First-order rate constants for vitamin D3 at various temperatures in Milli-Q (MQ), distilled (DW), and tap water (TW), along with the Arrhenius equation.
| DW | TW | MQ | |
|---|---|---|---|
| k1 (4 °C) (h−1] (CI) | 0.027 (0.023–0.031) | 0.012 (0.009–0.014) | 0.001 (0.000–0.002) |
| k1 (25 °C) (h−1) (CI) | 0.143 (0.124–0.162) | 0.099 (0.096–0.102) | 0.024 (0.021–0.026) |
| k1 (40 °C) (h−1) (CI) | 0.400 (0.385–0.416) | 0.339 (0.270–0.407) | 0.085 (0.077–0.092) |
| Arrhenius equation | y = −6465x + 19.74 | y = −8142x + 24.96 | y = −10,725x + 31.97 |
| R 2 | 1.000 | 0.999 | 0.988 |
| Ea (kJ/mol) | 53.8 | 67.7 | 89.2 |
CI—95% confidence interval; Ea—activation energy.