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Titolo:
Organic complexation and speciation of iron in the South and Equatorial Atlantic
Autore:
Powell, RT; Donat, JR;
Indirizzi:
Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA 23529 USA Old DominionUniv Norfolk VA USA 23529 m & Biochem, Norfolk, VA 23529 USA
Titolo Testata:
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
fascicolo: 13, volume: 48, anno: 2001,
pagine: 2877 - 2893
SICI:
0967-0645(2001)48:13<2877:OCASOI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRACE-METAL SPECIATION; NORTHERN NORTH-SEA; PACIFIC-OCEAN; MARINE-PHYTOPLANKTON; SIDEROPHORE PRODUCTION; SEAWATER; GROWTH; COORDINATION; LIMITATION; TRANSPORT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Powell, RT Louisiana Univ Marine Consortium, Chauvin, LA 70344 USA Louisiana Univ Marine Consortium Chauvin LA USA 70344 0344 USA
Citazione:
R.T. Powell e J.R. Donat, "Organic complexation and speciation of iron in the South and Equatorial Atlantic", DEEP-SEA II, 48(13), 2001, pp. 2877-2893

Abstract

Our investigation into the organic complexation and speciation of dissolved Fe in water column samples taken during the 1996 Intergovernmental Oceanographic Commission Baseline Expedition to the South and Equatorial AtlanticOcean confirms the ubiquity of Fe-complexing ligands. In most samples Fe is greater than 99% organically complexed by a ligand with a conditional stability constant (K ' (FeL,Fe ')) between 10(12) and 10(14). The deep-water masses exhibit no systematic differences with respect to ligand concentration or percent organic complexation. Greater than 2% of total dissolved Fe was present as inorganic Fe in some surface waters (1 m). The Amazon River does not appear to be a major source of these Fe-complexing ligands to the open ocean. Therefore, even in this area of relatively high atmospheric deposition, the majority of dissolved Fe is organically complexed by a ligand of unknown origin, and phytoplankton could potentially be Fe-limited if theyonly respond only to inorganic Fe. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 29/11/20 alle ore 16:23:08