Heavy metal distribution and early-diagenesis in salt marsh sediments from the Medway Estuary, Kent, UK

Spencer, K., Cundy, A.B. and Croudace, I.W. (2003) Heavy metal distribution and early-diagenesis in salt marsh sediments from the Medway Estuary, Kent, UK Estuarine Coastal and Shelf Science, 57 (1-2). pp. 43-54. ISSN 0272-7714

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Abstract

Salt marsh cores are increasingly being used to study metal pollution chronologies. Salt marshes in macro-tidal estuaries, however, tend to retain a time-integrated or ‘smoothed’ signal rather than a record of discrete pollutant inputs, due to extensive sediment reworking. More generally, an accurate chronology of metal input to salt marsh sediments can be difficult to assess because of the potential early-diagenetic mobility of both the radionuclides used for dating and the contaminants of interest. A dated salt marsh core from the macro-tidal Medway Estuary, southeast England, was assessed using both total sediment metal data and partitioning data. These data indicate that both Mn and Fe have been significantly remobilised and that these diagenetic processes have slightly modified the vertical distributions of Cu, Pb and Zn. Zinc is the most diagenetically reactive followed by Cu and then Pb. However, general trends in pollutant loading can still be identified with maximum inputs occurring between ca. 1900 and 1950, decreasing towards the present day.

Item Type:Journal article
Uncontrolled Keywords:heavy metals; lead-210; Caesium-137; sediment pollution; diagenetic mobility; partitioning; Medway Estuary
Subjects:F000 Physical Sciences > F600 Geology
H000 Engineering > H200 Civil Engineering > H220 Environmental Engineering
DOI (a stable link to the resource):10.1016/S0272-7714(02)00324-4
Faculties:Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology > Ecology, Landscape and Pollution Management
Faculty of Science and Engineering > School of Environment and Technology
ID Code:147
Deposited By:editor environment
Deposited On:06 Oct 2006
Last Modified:09 May 2012 16:48

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