Environmental Geochemistry and Health

, Volume 26, Issue 3–4, pp 411–419 | Cite as

Trends in sediment metal concentrations in the River Avoca, South-East Ireland

  • Anne Gaynor
  • N.F. Gray


Variation in sediment metal concentrations in the River Avoca, which is severely polluted by acid mine drainage (AMD) discharged from the abandoned sulphur and copper mines in Avoca, is reported. A survey of surface and subsurface sediments was repeated after seven years during exceptionally low flow conditions in 2001. The present study found that the reference (up-stream) site used in the original 1994 study was itself impacted by AMD, showing sediment metal enrichment by AMD to be greater than originally thought. The new reference site contained elevated Pb (570 µg g−1) in the subsurface sediment due to abandoned Pb-Zn mines 25 km further upstream. Concentrations of Cu (43 µg g−1), Zn (349 µg g−1) and Fe (4.0%) were normal for uncontaminated rivers. All the downstream sites showed sediment metal enrichment arising from the AMD (Cu and Zn p < 0.001; Fe p < 0.01). Subsurface concentrations of metals immediately below the mixing zone were Cu 904 µg g−1 (sd 335), Zn 723 µg g−1 (sd 93), Fe 6.3% (sd 1.5) and Pb 463 µg g−1 (sd 279). Monthly variation in metal concentrations at sites was not significantly different (p > 0.05). Although surface sediment metal concentrations were more variable, they followed similar trends to subsurface sediment. There were no significant differences in the subsurface sediment concentrations for either Cu or Zn over the period 1994 and 2001 immediately below the mines, although at the lowest site Zn had decreased by 35% over the period (p < 0.01). However there was a significant (p < 0.01) decrease over the period in the Fe concentration at all the impacted sites. This corresponds to a reduction in Fe concentration in the AMD and indicates that some remediation has occurred in the river since 1994.

Key words

acid mine drainage Cu Fe Pb pH riverine sediments Zn 


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  1. APHA 1989 Standard Methods for the Examination of Water and Waste Water, 17th edn. Washington, D.C., USA: American Public Health Association.Google Scholar
  2. Church MA, McLean DG, Wolcott JF. 1987 River bed gravels: sampling and analysis. In Thorne GR, Barthurst JC, Hey RD eds. Sediment Transport in Gravel-Bed Rivers. Chichester, UK: John Wiley & Sons.Google Scholar
  3. Dempsey P. 1912 Avoca. A History of the Vale. Avoca, Ireland: Avoca Publishers.Google Scholar
  4. Durkin V, Herrmann JG. 1996 Introduction: focusing on the problem of mining wastes. In Managing Environmental Problems at Inactive and Abandoned Metal Mine Sites. EPA/625/R-95/007. Washington D.C., USA: Centre for Environmental Research Information.Google Scholar
  5. Evangelon VP. 1995 Pyrite Oxidation and Its Control. Boca Raton, Florida, USA: CRC Press.Google Scholar
  6. Feltz HR. 1980 Significance of bottom material data in evaluating water quality. In Baker IRE ed. Contaminants and sediment. Michigan, USA: Ann Arbor Science.Google Scholar
  7. Gallagher V, O’Connor P. 1999 The Avoca mine site. Proc Royal Irish Acad, 99B, 43–57.Google Scholar
  8. Gray NF. 1995 Main Adit Flow and Metal Discharge Rates: Intensive Sampling Period May to October 1994 (Interim Report). Water Technology Research, Technical Report 13. Dublin, Ireland: Trinity College.Google Scholar
  9. Gray NF. 1996 A substrate classification index for the visual assessment of the impact of acid mine drainage in lotic systems. Water Res 30, 1551–1554.CrossRefGoogle Scholar
  10. Gray NF. 1997 Environmental impact and remediation of acid mine drainage: a management problem. Environ Geol 30, 62–71.CrossRefGoogle Scholar
  11. Gray NF. 1998 Acid mine drainage composition and the implications for its impact on lotic systems. Water Res 32, 2122–2134.CrossRefGoogle Scholar
  12. Herr C. 1995 Metal Fluxes in Water and Sediment of the Avoca River, Co. Wicklow, Southeast Ireland. MSc Thesis. Dublin, Ireland: Trinity College.Google Scholar
  13. Herr C, Gray NF. 1996 Seasonal variation of metal contamination of riverine sediments below a copper and sulphur mine in southeast Ireland. Water Sci Technol 33(6), 255–261.CrossRefGoogle Scholar
  14. Herr C, Gray NF. 1997 Metal contamination of riverine sediments below the Avoca mines, south east Ireland. Environ Geochem Health 19, 73–82.CrossRefGoogle Scholar
  15. McArdle P, Gallagher V, O’Connor P. 1993 Field Workshop Guide. Avoca Mining District, Co. Wicklow. EU contract: EV5V-CT93-0248. Dublin, Ireland: Geological Survey of Ireland.Google Scholar
  16. Platt JW. 1973 Avoca. Mining Ireland, 1, 72–93.Google Scholar
  17. Salomons W, Forstner U. 1980 Trace metal analysis in polluted sediments II. Evaluation of environmental impact. Environ Technol Lett 1, 506–517.CrossRefGoogle Scholar
  18. Sullivan M, Gray NF, O’Neill C. 1995 Synoptic Overview of the Avoca-Avonmore Catchment and the Avoca Mines. Water Technology Research, Technical Report 26. Dublin, Ireland: Trinity College.Google Scholar
  19. Thomas A, McArdle P. 1998 Avoca: Our Mining Heritage. Dublin, Ireland: Geological Survey of Ireland.Google Scholar
  20. Ward NI. 1995 Environmental sampling: the first important area of measuring heavy metals in the environment. In Wilken R, Forster D, Knochel P eds. Heavy Metals in the Environment II. Edinburgh, UK: CEP Consultants. 281–284.Google Scholar
  21. Ward NI. 2000 Trace analysis. In Fifield FW ed., Analytical Chemistry. Chichester, UK: John Wiley & Sons.Google Scholar
  22. Younger PL, Banwart SA, Hedin RS. 2002 Mine Water: Hydrology, Pollution and Remediation. Dordrecht, The Netherlands: Kluwer.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Centre for the Environment, Department of Civil, Structural, and Environmental EngineeringTrinity College, University of DublinIreland

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