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Framework for analysis of dynamic speciation and bioavailability of metals in aquatic systems

A dynamic approach to metal ion speciation analysis in aquatic ecosystems is essential for development of a rigorous basis for predictions of bioavailability and for reliable risk assessment strategies. A given sensor for speciation analysis is characterised by an effective response time that defines the metal species it is able to measure, i.e. its kinetic window.

We present a common dynamic interpretation framework, based on rigorous flux expressions, for a suite of sensors that span a range of response times. The coherence and complementarily of the attainable information is assessed by measurements on well-defined metal-NTA systems. Interpolation from a kinetic spectrum of speciation analysis information is proposed as a practical strategy for addressing questions of bioavailability.

This result has been submitted for publication in the international peer-reviewed scientific journal, Environmental Science & Technology. The information will allow any interested end users (e.g. other researchers, water quality monitoring agencies, etc.) to apply our approach.

Reported by

University of Southern Denmark
Department of Chemistry, Campusvej 55
DK 5230 Odense
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