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TitleUsing soil geochemical data to estimate the range of background element concentrations for ecological and human-health risk assessments
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AuthorRencz, A N; Garrett, R G; Kettles, I M; Grunsky, E C; McNeil, R J
SourceGeological Survey of Canada, Current Research (Online) no. 2011-9, 2011, 26 pages, https://doi.org/10.4095/288746
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year2011
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
RelatedThis publication is related to Rencz, A N; Kettles, I M; (2011). Presentations and recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010, Geological Survey of Canada, Open File 6645
File formatpdf (Adobe Acrobat Reader)
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
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; environmental geology; geochemical interpretations; geochemical analyses; environmental studies; environmental impacts; ecology; soil geochemistry; soils; soil studies; soil properties; pollution; pollutants; arsenic; lead
Illustrationslocation maps; tables; plots; histograms
ProgramEcosystems Risk Characterization, Environmental Geoscience
Released2011 12 09
AbstractA workshop on the role of geochemical data in ecological and human-health risk assessments was sponsored by Health Canada and Environment Canada in 2010. Participants from Geological Survey of Canada developed recommendations for acquiring and analyzing soil geochemical data to support risk assessment and outlined a procedure for estimating geochemical background, released as GSC Open File 6645. The following practices are proposed: 1) the collection of soil samples from pedologic horizons (the C, in particular) rather than depth-based intervals; 2) use of a spatially random sample design; 3) analysis of the less than 2 mm fraction (without ball or ring pulverizing) as a standard. Additionally, analysis of the silt-sized and finer fraction (<0.063 mm) provides more information on the mineral phases and residence sites of elements in soils and the patterns of regional variation; 4) dissolution using the USEPA 3050B aqua regia variant. Additionally, a method for estimating the amount of loosely held 'bioaccessible' amounts of the total-element concentration should be considered (e.g. water leach); 5) archiving of sample splits; and 6) evaluation of chemical data through the insertion, analysis, and monitoring of QA/QC samples.
The procedure for estimating geochemical background is based on plotting maps and graphs using the 'rgr' library and functions in R. R is an open source software environment and is available through CRAN mirror sites linked to http://www.r-project.org/. Metadata for 700 geochemical surveys carried out by the GSC and provincial agencies can be accessed through the Geochemical Data Repository at Natural Resources Canada.
GEOSCAN ID288746