First discrete iron(II) records from Dome C (Antarctica) and the Holtedahlfonna glacier (Svalbard)

Fe(II) is more soluble and bioavailable than Fe(III) species, therefore the investigation of their relative abundance and redox processes is relevant to better assess the supply of bioavailable iron to the ocean and its impact on marine productivity. In this context, we present a discrete chemilumin...

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Bibliographic Details
Published in:Chemosphere
Main Authors: Burgay François, Barbaro Elena, Cappelletti David, Turetta Clara, Gallet Jean-Charles, Isaksson Elisabeth, Stenni Barbara, Dreossi Giuliano, Scoto Federico, Barbante Carlo, Spolaor Andrea
Other Authors: Burgay, Françoi, Barbaro, Elena, Cappelletti, David, Turetta, Clara, Gallet, Jean-Charle, Isaksson, Elisabeth, Stenni, Barbara, Dreossi, Giuliano, Scoto, Federico, Barbante, Carlo, Spolaor, Andrea
Format: Article in Journal/Newspaper
Language:English
Published: 2021
Subjects:
Arctic
Antarctic
The Antarctic
Svalbard
Hudson
Holtedahlfonna
Antarc*
Antarctica
glacier
Online Access:http://hdl.handle.net/11391/1482666
https://doi.org/10.1016/j.chemosphere.2020.129335
https://www.sciencedirect.com/science/article/abs/pii/S0045653520335323
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Summary:Fe(II) is more soluble and bioavailable than Fe(III) species, therefore the investigation of their relative abundance and redox processes is relevant to better assess the supply of bioavailable iron to the ocean and its impact on marine productivity. In this context, we present a discrete chemiluminescence-based method for the determination of Fe(II) in firn matrices. The method was applied on discrete samples from a snow pit collected at Dome C (DC, Antarctica) and on a shallow firn core from the Holtedahlfonna glacier (HDF, Svalbard), providing the first Fe(II) record from both Antarctica and Svalbard. The method showed low detection limits (0.006 ng g−1 for DC and 0.003 ng g−1 for the HDF) and a precision ranging from 3% to 20% RSD. Fe(II) concentrations ranged between the LoD and 0.077 ng g−1 and between the LoD and 0.300 ng g−1 for the Antarctic and Arctic samples, respectively. The Fe(II) contribution with respect to the total dissolved Fe was comparable in both sites accounting, on average, for 5% and 3%, respectively. We found that Fe(II) correctly identified the Pinatubo/Cerro Hudson eruption in the DC record, demonstrating its reliability as volcanic tracer, while, on the HDF core, we provided the first preliminary insight on the processes that might influence Fe speciation in firn matrices (i.e. organic ligands and pH influences).

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