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TitreThe tri-national (2007) Maritimes data: some important and interesting observations
TéléchargerTéléchargement (publication entière)
AuteurGarrett, R G
SourcePresentations and recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010; par Rencz, A N (éd.); Kettles, I M (éd.); Commission géologique du Canada, Dossier public 6645, 2011 p. 24; 1 CD-ROM, https://doi.org/10.4095/287949
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Année2011
ÉditeurRessources naturelles Canada
RéunionWorkshop on the role of geochemical data in environmental and human health risk assessment; Halifax; CA; mars 17-18, 2010
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/287949
MediaCD-ROM; en ligne; numérique
Référence reliéeCette publication est contenue dans 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, Commission géologique du Canada, Dossier public 6645
Référence reliéeCette publication est reliée 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, Commission géologique du Canada, Dossier public 6282
Référence reliéeCette publication est contenue dans 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, Commission géologique du Canada, Dossier public 6645
Formatspdf
ProvinceNouveau-Brunswick; Terre-Neuve-et-Labrador; Nouvelle-Écosse; Île-du-Prince-Édouard
SNRC1; 2; 10; 11; 12; 20; 21
Lat/Long OENS-70.0000 -52.0000 53.0000 43.0000
Sujetsanalyse environnementales; etudes de l'environnement; effets sur l'environnement; géochimie du sol; sols; études pédologiques; échantillons de sol; propriétés du sol; contamination des métaux lourds; pollution; substances polluantes; biogéochimie; levés biochimiques; dépôts glaciaires; tills; levés géochimiques; géochimie; pédologie; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; Cénozoïque; Quaternaire
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
Bibliothèque de Ressources naturelles Canada - Calgary (Sciences de la Terre)
 
Commission géologique du Canada (Atlantique)
 
Bibliothèque de Ressources naturelles Canada - Vancouver (Sciences de la Terre)
 
Bibliothèque de Ressources naturelles Canada - Québec (Sciences de la Terre)
 
ProgrammeEcosystems Risk Characterization, Géoscience de l'environnement
Diffusé2011 01 01
Résumé(disponible en anglais seulement)
The 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