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Colloidal Metals in the Tamar Estuary and their Influence on Metal Fractionation by Membrane Filtration

Colloidal Metals in the Tamar Estuary and their Influence on Metal Fractionation by Membrane... Environmental Context. Trace metals play an essential role in the growth and function of aquatic organisms; however, enhanced metal concentrations can have detrimental effects on ecosystems. The distribution of metals between filterable and filter-retained phases is key to their bioavailability and biogeochemical cycling. Studies on rivers have shown that separating dissolved metals from particle-associated metals may introduce significant artefacts in the resulting filtrate concentrations. Comparable studies on turbid estuarine waters are necessary to improve the design of water sampling programmes. Abstract. Total filterable and colloidal metals were measured in the Tamar Estuary. The colloidal fraction (M c ) was highly variable for each metal, both spatially and temporally. In April 2001, Al c and Co c were higher in the river than the estuary, Cd c , Cr c and Pb c were lower, and Mn c and U c were similar. In September 2001, Cd c was higher in the river than the estuary. Colloidal Al and Mn were positively correlated with concentrations of suspended particles, whereas the colloid contents of the other metals were primarily determined by additional factors. The effect of the colloidal metal content on resultant metal filtrate concentrations, as a function of sample volume filtered, was examined. The amount of Al, Cd, Cu, Pb, and U in the filtrate decreased significantly in at least one case, whereas Mn initially increased in some cases. There was no change for Co, Cr, and Zn. The implications of these results for the study of trace metals in moderately turbid estuaries are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Chemistry CSIRO Publishing

Colloidal Metals in the Tamar Estuary and their Influence on Metal Fractionation by Membrane Filtration

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References (42)

Publisher
CSIRO Publishing
Copyright
CSIRO
ISSN
1448-2517
eISSN
1449-8979
DOI
10.1071/EN06004
Publisher site
See Article on Publisher Site

Abstract

Environmental Context. Trace metals play an essential role in the growth and function of aquatic organisms; however, enhanced metal concentrations can have detrimental effects on ecosystems. The distribution of metals between filterable and filter-retained phases is key to their bioavailability and biogeochemical cycling. Studies on rivers have shown that separating dissolved metals from particle-associated metals may introduce significant artefacts in the resulting filtrate concentrations. Comparable studies on turbid estuarine waters are necessary to improve the design of water sampling programmes. Abstract. Total filterable and colloidal metals were measured in the Tamar Estuary. The colloidal fraction (M c ) was highly variable for each metal, both spatially and temporally. In April 2001, Al c and Co c were higher in the river than the estuary, Cd c , Cr c and Pb c were lower, and Mn c and U c were similar. In September 2001, Cd c was higher in the river than the estuary. Colloidal Al and Mn were positively correlated with concentrations of suspended particles, whereas the colloid contents of the other metals were primarily determined by additional factors. The effect of the colloidal metal content on resultant metal filtrate concentrations, as a function of sample volume filtered, was examined. The amount of Al, Cd, Cu, Pb, and U in the filtrate decreased significantly in at least one case, whereas Mn initially increased in some cases. There was no change for Co, Cr, and Zn. The implications of these results for the study of trace metals in moderately turbid estuaries are discussed.

Journal

Environmental ChemistryCSIRO Publishing

Published: Jul 10, 2006

Keywords: colloids—estuary—filtration—speciation—trace elements

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