GEOSCAN Search Results: Fastlink


TitleTowards new estimated daily intakes for the Canadian population
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBonvalot, Y
SourcePresentations and recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010; by Rencz, A N (ed.); Kettles, I M (ed.); Geological Survey of Canada, Open File 6645, 2011 p. 11; 1 CD-ROM, Open Access logo Open Access
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
PublisherNatural Resources Canada
MeetingWorkshop on the role of geochemical data in environmental and human health risk assessment; Halifax; CA; March 17-18, 2010
Documentopen file
MediaCD-ROM; on-line; digital
RelatedThis publication is contained in Presentations and recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010
RelatedThis publication is related to North American soil geochemical landscapes project: Canadian field protocols for collecting mineral soils and measuring soil gas radon and natural radioactivity
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectsgeochemistry; soils science; surficial geology/geomorphology; environmental geology; Health and Safety; environmental analysis; environmental studies; environmental impacts; soil geochemistry; soils; soil studies; soil samples; soil properties; heavy metals contamination; pollution; pollutants; biogeochemistry; biogeochemical surveys; glacial deposits; tills; geochemical surveys; Human health; Cenozoic; Quaternary
ProgramEnvironmental Geoscience
Released2011 01 01
AbstractCanadians are exposed to background contamination through air, water, soil, food and consumer products. This background exposure is quantified, for a given contaminant, by Estimated Daily Intakes (EDIs). EDIs estimate the typical concurrent background exposure from all known or suspected sources (ambient and indoor air, drinking water, soil, food, breast milk, consumer products) via all known or suspected routes (inhalation, ingestion, dermal contact) for the average Canadian. The total EDI of a chemical - the summation of all these concurrent EDIs - is determined through a multimedia exposure assessment in which a lot of information are required.
In risk assessments, RTDI (Residual tolerable daily intake) is considered and corresponds to the dose of a chemical above background to which a person could be exposed without expected adverse effects (i.e., RTDI = TDI - EDI, where TDI is the tolerable daily intake). Additionally, in the derivation of the human health quality guidelines, 20% of the RTDI is allotted to each of the five primary media to which people are potentially exposed (i.e., air, water, soil, food and consumer products).
As can be seen, EDIs are an important piece of the human health risk assessment process. For compounds with available EDIs and for compounds still without, there is a need:
To assess or re-assess EDIs on a regular basis (data update for example)
To evolve towards more accurate EDIs (moving from deterministic to probabilistic EDIs for example)
To be transparent in the way EDIs are estimated in order to be easily revisited and updated on a regular basis (every five years for example)
This talk will briefly explain the various key aspects of the EDI protocol developed by the HC-CSD in order to assess new Canadian EDIs for several chemicals, notably:
Chemicals priorization
Data and / or studies selection process
Canadian population parameters selection
Mediums and routes of exposure
Fit of statistical distributions
Simulations results
Emphasis will be devoted to the current data limitations and their consequences. The urgent need of cooperation between all the federal / provincial / local data generators in order to produce more realistic EDIs will also be highlighted.

Date modified: