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Efficiency of sediment quality guidelines for predicting toxicity: the case of the St. Lawrence River

Desrosiers, M. et Babut, M. P. et Pelletier, M. et Bélanger, C. et Thibodeau, S. et Martel, L. (2009). Efficiency of sediment quality guidelines for predicting toxicity: the case of the St. Lawrence River. Integrated Environmental Assessment and Management , 6 (2). p. 225-239. DOI: 10.1897/IEAM_2009-026.1.

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Résumé

Multitiered frameworks that are designed for risk assessment of contaminated sediment rely on sediment quality guidelines (SQGs) at the first tier or screening level. In the case of contamination by multiple pollutants, results can be aggregated under indices such as the mean quotient. A decision is then reached (e.g., to dispose of dredged materials in open water) without further investigation, provided that the SQGs or the specific values of indices or quotients derived from the SQGs are not exceeded. In this way, SQGs and quotients play a critical role in environmental protection. As part of the development of a tiered framework to assess the environmental risk of materials dredged from the St. Lawrence River, we evaluated various quotients based on SQGs available for this river with a data set that matches chemistry and toxicity test endpoints. The overall efficiency of all tested quotients was rather low, and we then examined factors such as sediment grain size, nutrients, metal-binding phases (e.g., Al, Fe), and dissolved organic carbon to explain misclassified samples. This examination led to the design of a modified tier 1 framework in which SQGs are used in combination with decision rules based on certain explanatory factors.

Type de document: Article scientifique
Statut du texte intégral: Autre
Mots-clés libres: Sédiments contaminés, Évaluation du risque écologique, Prévision de toxicité, Facteurs de confusion, Fleuve Saint-Laurent // Sediments quality guidelines, Ecological risk assessment, Toxicity prediction, Confounding factors, St. Lawrence River Contaminants,
Sujets: 1. Laboratoire de développement durable > 1.5. Société, qualité de vie, santé, sécurité
1. Laboratoire de développement durable > 1.7. Environnement, écologie, écosystème
2. Milieu physique > 2.4. Hydrologie
6. Milieu humain
8. Impacts et monitoring > 8.1. Qualité de l’eau
Date de dépôt: 01 avr. 2017 19:27
Dernière modification: 01 avr. 2017 19:27
URI: http://belsp.uqtr.ca/id/eprint/1084

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