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Phosphorus in Antarctic surface marine sediments - chemical speciation in Admiralty Bay

Phosphorus in Antarctic surface marine sediments - chemical speciation in Admiralty Bay Abstract This study describes the relation of the phosphorus chemical speciation in surface sediments with input processes in Admiralty Bay, King George Island, Antarctica. The sediments were analysed with a sequential extraction for phosphorus fractionation to measure: exchangeable P (Pexch), iron oxyhydroxide bound P (P-Fe), authigenic P (Auth-P), detrital P (Detrital-P) and organic P (Porg). The study revealed that Detrital-P (39–70%) was the main sedimentary phosphorus forms and Auth-P (40–54%) was the second largest pool. The average percentage of each fraction of P followed the sequence: Detrital-P (41%) > Auth-P (37%) > P-Fe (12%) > Porg = Pexch (5%). Spatial differences in grain size distribution were found. Silt and clay factions were predominant in the inlets, whereas sand and gravel were the main components in Central bay (unofficial name). Values were extremely low for organic carbon (< 0.30%) and total nitrogen (< 0.17%). Total sulfur was lower than 0.15%, except for Mackellar Inlet where values were 1%. The dominance of detrital apatite in the total sedimentary phosphorus demonstrates the importance of terrestrial inputs from ice melting in governing the abundance and speciation of sedimentary phosphorus in the Admiralty Bay sediments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Antarctic Science Cambridge University Press

Phosphorus in Antarctic surface marine sediments - chemical speciation in Admiralty Bay

Antarctic Science , Volume 26 (3): 9 – Sep 19, 2013
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Publisher
Cambridge University Press
Copyright
Copyright © Antarctic Science Ltd 2013 
ISSN
1365-2079
eISSN
0954-1020
DOI
10.1017/S0954102013000552
Publisher site
See Article on Publisher Site

Abstract

Abstract This study describes the relation of the phosphorus chemical speciation in surface sediments with input processes in Admiralty Bay, King George Island, Antarctica. The sediments were analysed with a sequential extraction for phosphorus fractionation to measure: exchangeable P (Pexch), iron oxyhydroxide bound P (P-Fe), authigenic P (Auth-P), detrital P (Detrital-P) and organic P (Porg). The study revealed that Detrital-P (39–70%) was the main sedimentary phosphorus forms and Auth-P (40–54%) was the second largest pool. The average percentage of each fraction of P followed the sequence: Detrital-P (41%) > Auth-P (37%) > P-Fe (12%) > Porg = Pexch (5%). Spatial differences in grain size distribution were found. Silt and clay factions were predominant in the inlets, whereas sand and gravel were the main components in Central bay (unofficial name). Values were extremely low for organic carbon (< 0.30%) and total nitrogen (< 0.17%). Total sulfur was lower than 0.15%, except for Mackellar Inlet where values were 1%. The dominance of detrital apatite in the total sedimentary phosphorus demonstrates the importance of terrestrial inputs from ice melting in governing the abundance and speciation of sedimentary phosphorus in the Admiralty Bay sediments.

Journal

Antarctic Science – Cambridge University Press

Published: Sep 19, 2013

Keywords: bottom sediment; detrital apatite; P sequential extraction; South Shetland Islands; total phosphorus

References

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