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- W5536694 abstract "Life cycle assessment (LCA) is a tool used to evaluate the potential impacts that a product, service or process has on the environment over its entire life cycle. One of the purposes of the 3 rd phase of LCA, life cycle impact assessment (LCIA), is to classify the potential environmental impacts according to impact categories. This thesis focuses on the ―human toxicity‖ impact category: for this category, the impacts are evaluated as a combination of an intake fraction (iF) and an effect factor. The iF is the fraction of a release that will ultimately be taken in by the entire population. It takes into account the fate of and the exposure to the pollutant. The intake fraction is often calculated using multimedia and multi-pathways fate and exposure models. In LCA, the uncertainty of the human health potential impacts and, more specifically the intake fraction, is an important issue. The sources of uncertainty of the iF are: natural spatial and temporal variability and parameter uncertainty as well as model and scenario uncertainty. This thesis focuses on parameter uncertainty and the natural spatial and temporal variability of the input parameters used in a fate and exposure model for Canadian emission scenarios. Its main objective is to: Evaluate the uncertainty of fate and exposure parameters used to determine the intake fraction when assessing human health potential impacts. In order to achieve this objective, it is important to: determine and compare the spatial variability of the iF for three resolution scales; determine the contribution of the fate and exposure parameters to the uncertainty of the iF, depending on the chemical released in the environment; determine and compare the seasonal variability of the iF for two seasons of emission. The natural spatial variability is caused by the variability of the fate and exposure parameters as a function of the region of emission. However, the spatial resolution needed to evaluate the potential impacts on human health is still undetermined. The Canadian LCIA methodology LUCAS assumed a regionalization based on the ecozones spatial resolution, which may not be appropriate to evaluate the human health potential impacts especially when it comes to determining contaminant transport in water. Therefore, 3 spatial resolutions were tested for emissions of a set of organic chemicals: the ecozones (15 regions), the provinces and territories (13 regions) and the subwatersheds (172 regions). A set of chemicals was chosen to best" @default.
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- W5536694 date "2011-04-01" @default.
- W5536694 modified "2023-09-27" @default.
- W5536694 title "Évaluation de l'incertitude lors du développement de la fraction prise pour la détermination des impacts sur la santé humaine dans le cadre de l'analyse du cycle de vie" @default.
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