Abstract
Water and intertidal sediment samples were collected from 28 stations along the Thames Estuary, from the tidal limit to the outer estuary. Surveys were conducted in 1997, 1999 and 2001 to assess spatial distributions and short-term variability. Highest concentrations of trace metals in water coincided with high turbidity in the mid-estuarine region, although the particle-associated fraction varied from 22% (As) to 95% (Pb). Theoretical dilution line (TDL) plots showed that dissolved metals were largely derived from a combination of diffuse (sediment desorption) and localised point sources (outfalls, industry). Dissolved Cu and Zn both exceeded environmental quality standard (EQS) levels during the survey period. The majority of sediment metals showed common distributional patterns, with increasing concentrations upstream. This increase was greatest for pollutant metals: Ag, Cd, Cu, Hg, Pb and Zn. Partial extraction of sediment metals with 1 M HCl showed that >50% of Ag, Cd, Cu, Mn, Pb and Zn were potentially bioavailable and that the proportion of bioavailable sediment metals also increased upstream. The majority of sediment metal concentrations exceeded Interim Sediment Quality Guideline threshold effects levels (TELs) over much of the estuary. Sediment concentrations of Cu, Hg, Pb and Zn also exceeded probable effects levels (PELs) at many estuarine sites. Despite improvements in recent years, the Thames Estuary remains chronically contaminated with a range of metals.
Similar content being viewed by others
References
Andrews, M. J., 1984. Thames Estuary: pollution and recovery. In Sheehan, P. J., D. R. Miller, G. C. Butler & P. Bourdeau (eds), Effects of Pollutants at the Ecosystem Level. John Wiley and Sons, Chichester: 195–227.
Attrill, M. & R. Myles Thomas, 1995. Heavy metal concentrations in sediment from the Thames Estuary, UK. Marine Pollution Bulletin 30: 742–744.
Bryan, G. W. & W. J. Langston, 1992. Bioavailability, accumulation and effects of heavy-metals in sediments with special reference to United Kingdom estuaries—a review. Environmental Pollution 76: 89–131.
Burton, J. D. & P. S. Liss, 1976. Estuarine Chemistry. Academic Press, London.
CCME, 1999. Canadian Sediment Quality Guidelines for the Protection of Aquatic Life: Summary Tables. Canadian Environmental Quality Guidelines, Canadian Council of Ministers for Environment, Winnipeg.
CEFAS, 1997. Monitoring and surveillance of non-radioactive contaminants in the aquatic environment and activities regulating the disposal of wastes at sea, 1994. 59 Aquatic Environment Monitoring Report.
Danielsson, L. G., B. Magnusson, S. Westerlund & K. Zhang, 1982. Trace-metal determinations in estuarine waters by electrothermal atomic-absorption spectrometry after extraction of dithiocarbamate complexes into freon. Analytica Chimica Acta 144: 183–188.
Harino, H., S. C. M. O’Hara, G. R. Burt, B. S. Chesman, N. D. Pope & W. J. Langston, 2003. Organotin compounds in Mersey and Thames Estuaries a decade after UK TBT legislation. Journal of the Marine Biological Association of the United Kingdom 83: 11–22.
Harper, D. J., 1988. Dissolved cadmium and lead in the Thames Estuary. Marine Pollution Bulletin 19: 535–538.
Kinniburgh, J., 1998. Physical and chemical characteristics. In Attrill, M. J. (ed.), A Rehabilitated Estuarine Ecosystem. The Environment and Ecology of the Thames Estuary. Kluwer Academic Publishers, Dordrecht: 27–48.
Knox, S., W. J. Langston, M. Whitfield, D. R. Turner & M. I. Liddicoat, 1984. Statistical-analysis of estuarine profiles. 2. Application to arsenic in the Tamar Estuary (SW England). Estuarine Coastal and Shelf Science 18: 623–638.
Langston, W. J., 1983. The behavior of arsenic in selected United Kingdom estuaries. Canadian Journal of Fisheries and Aquatic Sciences 40: 143–150.
Langston, W., G. Burt & N. Pope, 1999. Bioavailability of metals in sediments of the Dogger Bank (Central North Sea): a Mesocosm Study. Estuarine, Coastal and Shelf Science 48: 519–540.
Langston, W. J., P. E. Gibbs, P. L. Pascoe, B. S. Chesman, G. R. Burt, N. D. Pope & J. McEvoy, 2000. Tributyltin (TBT) impact in the Thames Estuary. 67 Thames Estuary Environmental Quality Series. Marine Biological Association, Plymouth.
Langston, W. J., B. S. Chesman, G. R. Burt, J. McEvoy & N. D. Pope, 2003. Bioaccumulation of metals in the Thames Estuary—1999. Thames Estuary Environmental Quality Series (8): 131 pp.
McEvoy, J., W. J. Langston, G. R. Burt & N. D. Pope, 2000. Bioaccumulation of metals in the Thames Estuary—1997. Thames Estuary Environmental Quality Series (2): 116 pp.
Nelson, L. A., 1979. Minor elements in the sediments of the Thames Estuary. Estuarine and Coastal Marine Science 9: 623–629.
Nelson, L. A., 1981. Mercury in the Thames Estuary. Environmental Technology Letters 2: 225–232.
O’Reilly Wiese, S. B., C. L. MacLeod & J. N. Lester, 1997. A recent history of metal accumulation in the sediments of the Thames Estuary, United Kingdom. Estuaries 20: 483–493.
Pope, N. D., J. Widdows & M. D. Brinsley, 2006. Estimation of bed shear stress using the turbulent kinetic energy approach—a comparison of annular flume and field data. Continental Shelf Research 26(8): 959–970.
Power, M., M. J. Attrill & R. M. Thomas, 1999. Heavy metal concentration trends in the Thames Estuary. Water Research 33: 1672–1680.
Scrimshaw, M. D. & J. N. Lester, 1995. Organochlorine contamination in sediments of the Inner Thames Estuary. Journal of Chartered Institute of Water and Environment Management 9: 519–525.
Scrimshaw, M. D. & J. N. Lester, 1997. Estimates of the inputs of polychlorinated biphenyls and organochlorine insecticides to the River Thames derived from the sediment record. Philisophical Transactions of the Royal Society, London. Series A 355: 189–212.
Smith, J. D., R. A. Nicholson & P. J. Moore, 1973. Mercury in sediments from the Thames Estuary. Environmental Pollution 4: 153–157.
Stevenson, C. & B. Ng, 1999. Distribution of copper, nickel and zinc in the Thames Estuary. Marine Pollution Bulletin 38: 328–331.
Tinsley, D., 1998. The Thames Estuary: a history of the impact of humans on the environment and a description of the current approach to environmental management. In Attrill, M. J. (ed.), A Rehabilitated Estuarine Ecosystem. The Environment and Ecology of the Thames Estuary. Kluwer Academic Publishers, Dordrecht: 5–26.
Turner, A., G. E. Millward & A. W. Morris, 1991. Particulate metals in five major North Sea estuaries. Estuarine, Coastal and Shelf Science 32: 325–346.
Acknowledgments
Support for this study from the Environment Agency (Thames Region) is gratefully acknowledged. We would particularly like to thank the EA fisheries staff at Crossness for assistance with small boats and use of laboratory facilities. We are also indebted to the crew of Thames Guardian for assistance with water sampling.
Author information
Authors and Affiliations
Corresponding author
Additional information
Guest editors: R. J. Uncles & S. B. Mitchell / The Thames Estuary and Estuaries of South East England
Rights and permissions
About this article
Cite this article
Pope, N.D., Langston, W.J. Sources, distribution and temporal variability of trace metals in the Thames Estuary. Hydrobiologia 672, 49–68 (2011). https://doi.org/10.1007/s10750-011-0758-5
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10750-011-0758-5