Ionic Composition of Seawater
|Ion||Mg/l||Meq/l||PPM as CACO3||Molal||Saturation|
|Calcium (Ca)||408.00||20.3603||1018.90||0.010|| |
|Magnesium (Mg)||1298.00||106.8093||5345.11||0.054|| |
|Sodium (Na)||10768.00||468.3776||23439.25||0.475|| |
|Potassium (K)||396.00||10.1284||506.86||0.010|| |
|Cations||12870.00||605.6758||30310.13|| || |
|Chloride (Cl)||19448.91||548.5828||27453.00||0.556|| |
|Bromide (Br)||67.00||0.8385||41.96||0.001|| |
|Assumptions|| || || || || |
|Alkalinity||0.00|| || || || |
|Temperature (C)||25.00|| || || || |
|pH||7.00|| || || || |
|SDI||4.00|| || || || |
|TDS (mg/l)||35092.91|| || || || |
|Conductivity (ÁS/cm)||51748.00|| || || || |
Why is the sea salty?
Seawater salt is derived from two sources, when rain falls on land it dissolves salts from the earth and these salts run down rivers and into the oceans where it is concentrated by the action of evaporation from the ocean surface to make more rain. The second source of salt is the leaching of sodium from the ocean floor, this sodium mixes with the HCl and other acidic gasses that escape from volcanoes and hydrothermal vents on the ocean floor to form sodium chloride, which happens to be the most abundant salt.
Eventually the salt reaches saturation and falls/forms to/on the floor of the ocean, then subduction of the tectonic plates moves this salt laden sea floor back under the earth where it once again becomes available to be dissolved by surface water.
|Dissolved salts in Ocean Water|
|Sea Salt is a more natural composition of salt compared to salt that you would buy in the store. Table salt is more than 99% Sodium Chloride while sea salt is 85% Sodium Chloride, the rest being other salts (see the table to the left).|
Sea salt composition is very close to the natural salt composition of the human body, however sea salt does not normally contain iodine, which is considered essential to human life. There are other sources of iodine such as dairy products. Most table salts contain iodine added to it.