Material/Constituent elements of seawater

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Approximate composition of seawater by mass:

Seawater
Element  % mass
Oxygen 85.7
Hydrogen 10.8
Chlorine 1.9
Sodium 1.05
Magnesium 0.14
Sulfur 0.09
Calcium 0.04
Potassium 0.04
Others Trace

figures from http://en.wikipedia.org/wiki/Seawater
Need to find a definitive source for these figures

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