FT-ICR mass spectra (negative electrospray ionization) from the time points t<sub>0</sub> of (A) artificial seawater and (B) natural seawater.


<p>Asterisks indicate inorganic trace impurities. Inserts show a zoom into the region of mass 325.0 to 325.2 Da. In the negative mode inorganic contaminations suppressed the ionization of organic substances present in low amounts in the artificial seawater.</p

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