Weight-of-evidence approach in environmental quality assessment

  1. Khosrovyan, Alla
unter der Leitung von:
  1. Tomás Angel del Valls Casillas Doktorvater
  2. Alice Newton Co-Doktorvater/Doktormutter
  3. Inmaculada Riba López Co-Doktormutter

Universität der Verteidigung: Universidad de Cádiz

Fecha de defensa: 12 von Dezember von 2014

  1. Julián Blasco Moreno Präsident/in
  2. Mercedes Conradi Barrena Sekretär/in
  3. Roberta Guerra Vocal
  1. Química Física

Art: Dissertation

Teseo: 375729 DIALNET


This Doctoral Thesis addresses an important issue of sediment contamination in aquatic ecosystems. Sediment is a home for benthic animals through which energy and material transfer in an ecosystem takes place. Sediment is affected by a multitude of processes of natural and anthropogenic origin, over centuries storing and accumulating contaminants immobilizing them in usually anoxic layers. However, if favorable conditions are created (dredging, acidification), the sediment can become a source of contaminants releasing them into the overlying water. That is why it is important to have robust tools for sediment quality assessment. The aim of this work was to investigate methods of assessing the quality of sediment disturbed by two anthropogenic processes ¿ dredging as a regular routine work carried out to maintain navigation routes and acidification, which may accidentally results from CO2 gas injection activities either during operations or at later stages through cracks in geological storage sites. Results indicated that the use of two lines of evidence (environmental chemistry and ecotoxicology) under an integrative, weight-of-evidence (WOE) approach is able to characterize the risk associated with dredged material for its management. Also the use of these two lines of evidence under a WOE has been shown as a powerful tool to risk characterization of sediment acidification associated with CO2 leakages in aquatic environments.