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

Published online by Cambridge University Press:  19 September 2013

Gláucia B.B. Berbel  and
Elisabete S. Braga
Gláucia B.B. Berbel*
Affiliation:
Laboratório de Nutrientes, Micronutrientes e Traços Nos Oceanos, Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, Cidade Universitária - São Paulo, SP 05508-120, Brazil
Elisabete S. Braga
Affiliation:
Laboratório de Nutrientes, Micronutrientes e Traços Nos Oceanos, Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, Cidade Universitária - São Paulo, SP 05508-120, Brazil
*
glauciaberbel@uol.com.br
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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.

Keywords

bottom sedimentdetrital apatiteP sequential extractionSouth Shetland Islandstotal phosphorus
Type
Physical Sciences
Information
Antarctic Science , Volume 26 , Issue 3 , June 2014 , pp. 281 - 289
Copyright
Copyright © Antarctic Science Ltd 2013 

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