Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica
Abstract The determination of dissolved iron concentrations and speciation was conducted for the first time in surface seawater coastline samples collected during the austral summer of 2020 in Admiralty Bay, King George Island, Antarctica. The technique of competitive ligand exchange/adsorptive cath...
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ftdoajarticles:oai:doaj.org/article:76a7b0afdf3e4408b2416fa21b7834ce 2023-09-05T13:15:13+02:00 Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica SHEISA F.D. SIERPINSKI LUIS MIGUEL LAGLERA BAQUER CÉSAR C. MARTINS MARCO TADEU GRASSI 2023-08-01T00:00:00Z https://doi.org/10.1590/0001-3765202320211520 https://doaj.org/article/76a7b0afdf3e4408b2416fa21b7834ce EN eng Academia Brasileira de Ciências http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601101&lng=en&tlng=en http://www.scielo.br/pdf/aabc/v95s3/0001-3765-aabc-95-s3-e20211520.pdf https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765202320211520 https://doaj.org/article/76a7b0afdf3e4408b2416fa21b7834ce Anais da Academia Brasileira de Ciências, Vol 95, Iss suppl 3 (2023) Ads-CSV coastal waters dissolved iron iron biogeochemistry Science Q article 2023 ftdoajarticles https://doi.org/10.1590/0001-3765202320211520 2023-08-20T00:35:35Z Abstract The determination of dissolved iron concentrations and speciation was conducted for the first time in surface seawater coastline samples collected during the austral summer of 2020 in Admiralty Bay, King George Island, Antarctica. The technique of competitive ligand exchange/adsorptive cathodic stripping voltammetry with 2,3-dihydroxynaphthalene as the competing ligand was evaluated, showing a sensitivity between 14.25 and 21.05 nA nmol L-1 min-1, with an LOD of 14 pmol L-1 and a mean blank contribution of 0.248 nmol L-1. Physicochemical parameters such as pH (7.85 ± 0.2), salinity (32.7 ± 0.8) and dissolved oxygen (51.3 ± 26.6%) were compatible with those of the literature; however, the average temperature (4.2 ± 0.8 °C) was higher, possibly as a reflection of global warming. The dissolved iron mean value was 18.9 ± 6.1 nmol L-1, with a total ligand concentration of 23.6 ± 12.2 nmol L-1 and a conditional stability complex constant of 12.2 ± 0.2, indicating humic substances as possible ligands. On average, the calculated free iron concentrations were 0.7 ± 0.3 pmol L-1. Relatively high concentrations of iron indicate a possible local source of Fe, likely predominantly from upwelling sediments and secondarily from ice-melting waters, which does not limit the growth of the phytoplankton. Article in Journal/Newspaper Antarc* Antarctica King George Island Directory of Open Access Journals: DOAJ Articles Admiralty Bay Austral King George Island Anais da Academia Brasileira de Ciências 95 suppl 3 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Ads-CSV coastal waters dissolved iron iron biogeochemistry Science Q |
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Ads-CSV coastal waters dissolved iron iron biogeochemistry Science Q SHEISA F.D. SIERPINSKI LUIS MIGUEL LAGLERA BAQUER CÉSAR C. MARTINS MARCO TADEU GRASSI Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica |
topic_facet |
Ads-CSV coastal waters dissolved iron iron biogeochemistry Science Q |
description |
Abstract The determination of dissolved iron concentrations and speciation was conducted for the first time in surface seawater coastline samples collected during the austral summer of 2020 in Admiralty Bay, King George Island, Antarctica. The technique of competitive ligand exchange/adsorptive cathodic stripping voltammetry with 2,3-dihydroxynaphthalene as the competing ligand was evaluated, showing a sensitivity between 14.25 and 21.05 nA nmol L-1 min-1, with an LOD of 14 pmol L-1 and a mean blank contribution of 0.248 nmol L-1. Physicochemical parameters such as pH (7.85 ± 0.2), salinity (32.7 ± 0.8) and dissolved oxygen (51.3 ± 26.6%) were compatible with those of the literature; however, the average temperature (4.2 ± 0.8 °C) was higher, possibly as a reflection of global warming. The dissolved iron mean value was 18.9 ± 6.1 nmol L-1, with a total ligand concentration of 23.6 ± 12.2 nmol L-1 and a conditional stability complex constant of 12.2 ± 0.2, indicating humic substances as possible ligands. On average, the calculated free iron concentrations were 0.7 ± 0.3 pmol L-1. Relatively high concentrations of iron indicate a possible local source of Fe, likely predominantly from upwelling sediments and secondarily from ice-melting waters, which does not limit the growth of the phytoplankton. |
format |
Article in Journal/Newspaper |
author |
SHEISA F.D. SIERPINSKI LUIS MIGUEL LAGLERA BAQUER CÉSAR C. MARTINS MARCO TADEU GRASSI |
author_facet |
SHEISA F.D. SIERPINSKI LUIS MIGUEL LAGLERA BAQUER CÉSAR C. MARTINS MARCO TADEU GRASSI |
author_sort |
SHEISA F.D. SIERPINSKI |
title |
Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica |
title_short |
Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica |
title_full |
Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica |
title_fullStr |
Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica |
title_full_unstemmed |
Exploratory evaluation of iron and its speciation in surface waters of Admiralty Bay, King George Island, Antarctica |
title_sort |
exploratory evaluation of iron and its speciation in surface waters of admiralty bay, king george island, antarctica |
publisher |
Academia Brasileira de Ciências |
publishDate |
2023 |
url |
https://doi.org/10.1590/0001-3765202320211520 https://doaj.org/article/76a7b0afdf3e4408b2416fa21b7834ce |
geographic |
Admiralty Bay Austral King George Island |
geographic_facet |
Admiralty Bay Austral King George Island |
genre |
Antarc* Antarctica King George Island |
genre_facet |
Antarc* Antarctica King George Island |
op_source |
Anais da Academia Brasileira de Ciências, Vol 95, Iss suppl 3 (2023) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601101&lng=en&tlng=en http://www.scielo.br/pdf/aabc/v95s3/0001-3765-aabc-95-s3-e20211520.pdf https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765202320211520 https://doaj.org/article/76a7b0afdf3e4408b2416fa21b7834ce |
op_doi |
https://doi.org/10.1590/0001-3765202320211520 |
container_title |
Anais da Academia Brasileira de Ciências |
container_volume |
95 |
container_issue |
suppl 3 |
_version_ |
1776197029109694464 |