Chemistry
Pie Chart of Major Ions in Seawater
Last reviewed on 2026-05-22.
Chemistry — verifiable data, editable template
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Seawater's dissolved solids are dominated by sodium and chloride ions — together accounting for about 85% of all ions present. Values as a fraction of total dissolved solids.
The data
- Chloride — 55.0 %
- Sodium — 30.6 %
- Sulfate — 7.7 %
- Magnesium — 3.7 %
- Calcium — 1.2 %
- Potassium — 1.1 %
- Other — 0.7 %
Source
NOAA oceanography reference.
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