Table 1 Approximate total concentration of key ions in various environments (in moles/litre).
Ion | Modern sea water | Blood plasma | Cell cytoplasm |
|---|---|---|---|
Na+ | 0.4 | 0.14 | 0.01 |
K+ | 0.01 | 0.005 | 0.1 |
Ca2+ | 0.01 | 0.002 | 0.001 |
Mg2+ | 0.05 | 0.001 | 0.01 |
Fe | 10-8 (mostly Fe3+) | 10-5 | 10-3–10-4 |
Mn2+ | 10-8 | 10-8 | 10-6 |
Zn2+ | 10-9 | 10-5 | 10-3–10-4 |
Cu | 10-9 (Cu2+) | 10-5 | 10-5 |
Cl- | 0.5 | 0.1 | 0.1 |