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Dynamic speciation analysis and bioavailability of metals in aquatic systems.

Research output: Contribution to journalJournal article

Published

  • Herman P. van Leeuwen
  • Raewyn Town
  • Jacques Buffle
  • Rob F. M. Cleven
  • William Davison
  • Jaume Puy
  • Willem H. van Reimsdijk
  • Laura Sigg
Journal publication date15/11/2005
JournalEnvironmental Science and Technology
Journal number22
Volume39
Number of pages12
Pages8545-8556
Original languageEnglish

Abstract

Dynamic metal speciation analysis in aquatic ecosystems is emerging as a powerful basis for development of predictions of bioavailability and reliable risk assessment strategies. A given speciation sensor is characterized by an effective time scale or kinetic window that defines the measurable metal species via their labilities. Here we review the current state of the art for the theory and application of dynamic speciation sensors. We show that a common dynamic interpretation framework, based on rigorous flux expressions incorporating the relevant diffusion and reaction steps, is applicable for a suite of sensors that span a range of time scales. Interpolation from a kinetic spectrum of speciation data is proposed as a practical strategy for addressing questions of bioavailability. Case studies illustrate the practical significance of knowledge on the dynamic features of metal complex species in relation to biouptake, and highlight the limitations of equilibrium-based models.