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The fate of contaminants and stable Pb isotopes in a changing estuarine environment: 20 years on

The fate of contaminants and stable Pb isotopes in a changing estuarine environment: 20 years on
The fate of contaminants and stable Pb isotopes in a changing estuarine environment: 20 years on
Estuarine sediments provide an important sink for contaminants discharged into fluvial, estuarine, and nearshore settings, and numerous authors have utilized this trapping function to assess historical contaminant loadings and contaminant breakdown/transformation processes. This Article examines the retention of elemental and isotopic sedimentary signatures in an industrialized estuarine system subject to a strongly upward sea-level trend, over a 20 year period. Two contrasting saltmarsh sites (at Hythe and Hamble, part of the wider Southampton Water estuarine system, UK) were examined, which had been previously cored and analyzed in the early 1990s. Much of the geochemical record of recent anthropogenic activity has been eroded and lost at the Hamble site. In contrast, radiometric, isotopic and elemental records of anthropogenic activity have been retained in the Hythe marsh, with 137Cs and Cu depth profiles showing retention of input maxima related to fallout and local industrial discharges, respectively. Stable Pb isotope data show a broad degree of correspondence in cores analyzed in 1994 and 2014 when plotted against sediment (radiometric) age, indicating the usefulness of isotopic data in retaining information on Pb sources and in disentangling Pb input histories. New ultrahigh precision, double-spike mass spectrometry stable Pb isotope data allow clearer discrimination of historical Pb input phases, and highlight within-estuary mixing and supply of reworked, secondary contamination from erosion of anthropogenically labeled sediments elsewhere in the estuary.
0013-936X
9488-9497
Cundy, Andrew B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Croudace, Ian W.
24deb068-d096-485e-8a23-a32b7a68afaf
Cundy, Andrew B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Croudace, Ian W.
24deb068-d096-485e-8a23-a32b7a68afaf

Cundy, Andrew B. and Croudace, Ian W. (2017) The fate of contaminants and stable Pb isotopes in a changing estuarine environment: 20 years on. Environmental Science & Technology, 51 (17), 9488-9497. (doi:10.1021/acs.est.7b00973).

Record type: Article

Abstract

Estuarine sediments provide an important sink for contaminants discharged into fluvial, estuarine, and nearshore settings, and numerous authors have utilized this trapping function to assess historical contaminant loadings and contaminant breakdown/transformation processes. This Article examines the retention of elemental and isotopic sedimentary signatures in an industrialized estuarine system subject to a strongly upward sea-level trend, over a 20 year period. Two contrasting saltmarsh sites (at Hythe and Hamble, part of the wider Southampton Water estuarine system, UK) were examined, which had been previously cored and analyzed in the early 1990s. Much of the geochemical record of recent anthropogenic activity has been eroded and lost at the Hamble site. In contrast, radiometric, isotopic and elemental records of anthropogenic activity have been retained in the Hythe marsh, with 137Cs and Cu depth profiles showing retention of input maxima related to fallout and local industrial discharges, respectively. Stable Pb isotope data show a broad degree of correspondence in cores analyzed in 1994 and 2014 when plotted against sediment (radiometric) age, indicating the usefulness of isotopic data in retaining information on Pb sources and in disentangling Pb input histories. New ultrahigh precision, double-spike mass spectrometry stable Pb isotope data allow clearer discrimination of historical Pb input phases, and highlight within-estuary mixing and supply of reworked, secondary contamination from erosion of anthropogenically labeled sediments elsewhere in the estuary.

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Cundy and Croudace 2017 EST final accepted version - Accepted Manuscript
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More information

Accepted/In Press date: 2 August 2017
e-pub ahead of print date: 2 August 2017
Published date: 5 September 2017

Identifiers

Local EPrints ID: 413038
URI: http://eprints.soton.ac.uk/id/eprint/413038
ISSN: 0013-936X
PURE UUID: 8bdd8100-89db-474d-ba65-06fad0b01462
ORCID for Andrew B. Cundy: ORCID iD orcid.org/0000-0003-4368-2569

Catalogue record

Date deposited: 14 Aug 2017 16:30
Last modified: 07 Oct 2020 04:42

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