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Typical Concentrations of the Main Constituents of Seawater
It is also interesting to know that concentrations of gold and silver in seawater are equal to 4×10^-6 mg/L and 4×10^-5 mg/L respectively (values represent the median of reported measurements and concentrations of elements with very low abundances may vary with location by several orders of magnitude). Based on these concentrations, one cubic meter of seawater contains 0.04 mg of silver and 0.004 mg of gold.
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