Table 2.
Empirical equilibrium concentrations of main small ions (in mOsm/L H2O) in human blood plasma (assumed protein equivalent: − 12.2 mEq/L) from Guyton and Hall17 and the associated equilibrium concentrations of ions in a protein-free fluid along with the theoretical values of the Gibbs–Donnan factor calculated using the presented method (eq. (16)).
| Ion | Empirical equilibrium concentrations: plasma | Estimated equilibrium concentrations: protein-free fluid | Estimated Gibbs–Donnan factor |
|---|---|---|---|
| Na+ | 142.0 | 136.3 | 0.96 |
| K+ | 4.2 | 4.0 | 0.96 |
| Ca2+ | 1.3 | 1.2 | 0.92 |
| Mg2+ | 0.8 | 0.7 | 0.92 |
| Cl− | 108.0 | 112.5 | 1.04 |
| HCO3− | 24.0 | 25.0 | 1.04 |
| Lactate− | 1.2 | 1.3 | 1.04 |
| SO42− | 0.5 | 0.5 | 1.09 |
| HPO42− | 2.0 | 2.2 | 1.09 |