Linking biosensor responses to Cd, Cu and Zn partitioning in soils

Julian James Charles Dawson, C. D. Campbell, W. Towers, C. M. Cameron, Graeme Iain Paton

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Soils bind heavy metals according to fundamental physico-chemical parameters. Bioassays, using bacterial biosensors, were performed in pore waters extracted from 19 contrasting soils individually amended with Cd, Cu and Zn concentrations related to the EU Sewage Sludge Directive. The biosensors were responsive to pore waters extracted from Zn amended soils but less so to those of Cu and showed no toxicity to pore water Cd at these environmentally relevant amended concentrations. Across the range of soils, the solid-solution heavy metal partitioning coefficient (K-d) decreased (p < 0.01) with increasing amendments of Cu and Zn; Cu exhibited the highest Kd values. Gompertz functions of Cu and Zn, Kd values against luminescence explained the relationship between heavy metals and biosensors. Consequently, biosensors provide a link between biologically defined hazard assessments of metals and standard soil-metal physico-chemical parameters for determining critical metal loadings in soils. (c) 2005 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)493-500
Number of pages7
JournalEnvironmental Pollution
Volume142
Issue number3
DOIs
Publication statusPublished - Aug 2006

Keywords

  • heavy metals
  • partitioning coefficient
  • K-d
  • biosensors
  • pH
  • organic matter
  • METAL-CONTAMINATED SOILS
  • HEAVY-METALS
  • MICROBIAL PROCESSES
  • ORGANIC-MATTER
  • TRACE-METALS
  • PORE-WATER
  • TOXICITY
  • BIOAVAILABILITY
  • SENSITIVITY
  • SPECIATION

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