Salinity of Water

Salinity of fresh, brackish and sea water

Salinity is the saltiness or dissolved salt content of a body of water.

  • 35 g dissolved salt / kg sea water = 35 ppt = 35 o/oo = 3.5% = 35,000 ppm

Saline in Water

  • fresh water (typical city water in United States) : < 100 ppm
  • water supply typicaly restricted to : 500 ppm
  • fresh water - official salt concentration limits in drinking water US: 1000 ppm
  • typical limit agriculture irrigation : 2000 ppm
  • brackish water, mildly : 1000 - 5,000 ppm
  • brackish water, moderately : 5000 - 15,000 ppm
  • brackish water, heavily : 15,000 - 35,000 ppm
  • sea water : 30,000 - 50,000 ppm (approx. 35,000)
  • brine > 50.000 ppm
  • Dead sea : 330.000 ppm

Dissolved Salts in Sea Water

ComponentMass
(grams)
Pure water 965.31
Chlorine 19.10
Sodium 10.62
Magnesium 1.28
Sulfur 2.66
Calcium 0.40
Potassium 0.38
Minor constituents 0.24
Trace constituents 0.01
SUM 1000.00

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