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Salinity of Water

Salinity of fresh, brackish and sea water

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Salinity is the saltiness or measure of dissolved salt in water.

  • 35 g dissolved salt / kg sea water = 35 ppt = 35 o/oo = 3.5% = 35000 ppm = 35000 mg/l

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 - 15000 ppm
  • brackish water, heavily : 15000 - 35000 ppm
  • sea water : 30000 - 50000 ppm (approx. 35000)
  • brine > 50000 ppm
  • Dead sea : 330000 ppm

Dissolved Salts in Sea Water

Typical salts dissolved in sea water;

ComponentMass
(gram/kgwater)
- t -
(oC)

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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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