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WA12A Comparative Risk Studies and LCIA Toxicity Impacts
() Accounting for the bioavailability of metals in LCA and comparative risk assessment , using the Biotic Ligand Model.
Simmonnin, G.1, Payet, J.1, Jolliet, O.1, 1 Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
ABSTRACT- Current impact assessment methods for metals in LCA do not take into account their bioavailability. The present paper examines how it is possible to address metal bioavailability in comparative assessment, by taking advantage of the latest development in the Biotic Ligand Model(BLM). Using the AMI method [Assessment of the Median impact], effects of metals are characterized on the basis of the HC50 - the geometric mean of all available acute LC50. Taking copper as an example, the HC50 is calculated based on the BLM-LC50 of 36 aquatic species. Results shows that the HC50 for copper varies by a factor 100 as a function of water pH and DOC content. Interestingly, there is a good agreement between the mean laboratory HC50 and the HC50 calculated for the most common EU waters. The study shows that the BLM is well suited to account for both speciation and bioavailability of metals on the effect side. In addition the approach is compatible with assessment of organics based on HC50 or with conventional approaches based on EC50. Application to other metals will be discussed.
Key words: Comparative LCA, Metals, Bioavailability, BLM
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