pH 8.0; Oxygen 6-8 ppm; Sodium 11,000 ppm; potassium 380 ppm; calcium 400 ppm; magnesium 1,300 ppm; Chloride 19,000 ppm; sulfate 2600 ppm; carbonate 142 ppm. Sea water composition may be fresher near rivers and melting ice caps, and more concentrated near desert areas.