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The solution will be daubed onto a filament, dried and sealed inside the mass spectrometer in the next lab.
Scientists have discovered that the relative amount of strontium-86 and strontium-87 in seawater has changed over time.
The possibility of isotopic fractionation as an explanation for differences in Sr has been proposed to both authors on many occasions.
It therefore seems worthwhile to point out that isotopic fractionation does occur during the mass spectrometric ratio measurement.
In the last 40 million years, the sea has steadily become enriched in strontium-87.
Thus, at any given time during this long geological interval the ocean contained a unique ratio of the two strontium isotopes.