Gledhill, Martha , Hollister, Adrienne, Seidel, Michael, Zhu, Kechen, Achterberg, Eric P. , Dittmar, Thorsten and Koschinsky, Andrea (2022) Trace metal stoichiometry of dissolved organic matter in the Amazon plume. Science Advances, 8 (31). Art.Nr. eabm2249. DOI 10.1126/sciadv.abm2249.

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Abstract

Dissolved organic matter (DOM) is a distinct component of Earth’s hydrosphere and provides a link between the biogeochemical cycles of carbon, nutrients, and trace metals (TMs). Binding of TMs to DOM is thought to result in a TM pool with DOM-like biogeochemistry. Here, we determined elemental stoichiometries of aluminum, iron, copper, nickel, zinc, cobalt, and manganese associated with a fraction of the DOM pool isolated by solid-phase extraction at ambient pH (DOM SPE-amb ) from the Amazon plume. We found that the rank order of TM stoichiometry within the DOM SPE-amb fraction was underpinned by the chemical periodicity of the TM. Furthermore, the removal of the TM SPE-amb pool at low salinity was related to the chemical hardness of the TM ion. Thus, the biogeochemistry of TMs bound to the DOM SPE-amb component in the Amazon plume was determined by the chemical nature of the TM and not by that of the DOM SPE-amb .
Metal chemistry controls biogeochemistry of metals bound to organic matter in the Amazon plume.

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