Metal distribution during diagenesis in the contaminated sediments of Dulas Bay, Anglesey, N. Wales, UK

J. D. Whiteley, N. J. G. Pearce

Research output: Contribution to journalArticlepeer-review

38 Citations (SciVal)

Abstract

The Tessier sequential extraction procedure was applied to discrete layers from 9 sediment cores from Dulas Bay, Anglesey. Results provide data on the chemical association of heavy metals (Fe, Mn, Cu, Zn, Cd, and As with major) sedimentary phases, and provide information on changes in metal partitioning associated with the changing physicochemical conditions encountered during burial. Extremely high concentrations of heavy metals were recorded (e.g. Zn 3000 mug g(-1), Cu 2000 mug g(-1)) and resulting depth profiles clearly indicate the differential behaviour of metals during diagenesis where, with increasing depth, Fe, Mn and Cu become increasingly associated with sulphide phases. Substantial changes in porewater concentrations indicate zones of preferential mobilisation due to sharp alterations in physicochemical conditions. All metals are involved in processes of post depositional diagenetic cycling driven by organic matter degradation and O-2 utilisation in thermodynamically favoured sequence, Fe and Mn oxide and oxyhydroxide dissolution act as controlling variables leading to zones of solid phase metal enrichment. Phase equilibria have been calculated to elucidate observed solid phase partitioning at the redox boundary and processes of subsurface sulphide mineral formation. (C) 2002 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Article numberPII S0883-2927(02)00183-X
Pages (from-to)901-913
Number of pages13
JournalApplied Geochemistry
Volume18
Issue number6
Early online date13 Nov 2002
DOIs
Publication statusPublished - 01 Jun 2003

Keywords

  • SEQUENTIAL EXTRACTION PROCEDURE
  • ACID-MINE-DRAINAGE
  • CERTIFIED REFERENCE MATERIALS
  • AQUATIC SEDIMENTS
  • TRACE-METALS
  • AFON-GOCH
  • STREAM
  • SOIL
  • SPECIATION
  • TRANSPORT

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