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TitleThe tri-national (2007) Maritimes data: some important and interesting observations
DownloadDownload (whole publication)
AuthorGarrett, R G
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. 24; 1 CD-ROM, https://doi.org/10.4095/287949
Year2011
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
Lang.English
MediaCD-ROM; on-line; digital
RelatedThis publication is contained in 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
RelatedThis publication is related to Friske, P W B; Ford, K L; Kettles, I M; McCurdy, M W; McNeil, R J; Harvey, B A; (2010). North American soil geochemical landscapes project: Canadian field protocols for collecting mineral soils and measuring soil gas radon and natural radioactivity, Geological Survey of Canada, Open File 6282
RelatedThis publication is contained in 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
ProvinceNew Brunswick; Newfoundland and Labrador; Nova Scotia; Prince Edward Island
NTS1; 2; 10; 11; 12; 20; 21
Lat/Long WENS-70.0000 -52.0000 53.0000 43.0000
Subjectsgeochemistry; soils science; surficial geology/geomorphology; environmental geology; 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; Cenozoic; Quaternary
Viewing
Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
Natural Resources Canada library - Calgary (Earth Sciences)
 
Geological Survey of Canada (Atlantic)
 
Natural Resources Canada library - Vancouver (Earth Sciences)
 
Natural Resources Canada library - Québec (Earth Sciences)
 
ProgramEcosystems Risk Characterization, Environmental Geoscience
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Released2011 01 01
AbstractThe data for six elements, As, Cd, Cu, Ni, Pb and Zn, are investigated in soil samples collected by the Geological Survey of Canada (GSC) in the Maritime provinces (NB, NS and PEI) in 2007. Samples were collected from several soil horizons and intervals, 0-5 cm, A, 0-30 cm, B and C, by GSC, Environment Canada, and provincial agency staff, and in collaboration with soil scientists from Agriculture and Agri-Food Canada. A variety of analytical methods were investigated, ranging form a water leach to a 'total' mutli-acid digestion and Instrumental Neutron Activation (INA) applied to different sieved size fractions, <2 mm, <250 µm and <63 µm . Attention is focused on the data obtained using the Aqua Regia variant (4:1 HCl-HNO3) of the US-EPA 3050B protocol applied to the <2 mm fraction, with elements being determined in the digests by ICP-OES and ICPMS. An inspection of the data by soil horizon reveals systematic patterns of element distribution. For Pb and Cd levels decrease with depth until the B horizon is reached, they then increase and then fall with depth to the C horizon. For As, Cu, Ni, Pb and Zn levels increase with depth until the B horizon, where they drop, and than increase with depth to the C horizon. As a generalization, levels in the 0-5 cm interval and B horizons are similar, as are levels in the 0-30 cm interval and the C horizon. In general, observed levels in the 0-5 cm interval and B horizon are similar, and levels in the 0-30 cm interval are similar to the C horizon. The role of Fe and Organic carbon was investigated across the 0-5 cm, A, B and C horizons. It is shown that there are systematic variations with depth and that these major soil components exercise a control on trace element levels through their ability to sequester trace elements and bind them in mineral forms or with metallo-organic ligands. A variety of analytical protocols were applied to C horizon soils in an investigation of the amounts of elements that might be bioavailable, i.e. as estimates of bioaccessibility. These data show that bioaccessibility estimates using a water leach are 1.5 (Cd) to 3 (Pb) orders of magnitude than PBET estimates for gastric intake, and that PBET estimates are lower by a half to 1.5 orders of magnitude lower than the results of routine geochemical analyses employing aqua regia-like digestions. It is concluded that there are advantages to consistently sampling a single soil horizon or interval, and in the case of an interval, it should be as narrow as operationally feasible.
GEOSCAN ID287949