| Titre | The tri-national (2007) Maritimes data: some important and interesting observations |
| Télécharger | Téléchargement (publication entière) |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Garrett, R G |
| Source | Presentations 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  Accès ouvert |
| Liens | Canadian Database of Geochemical Surveys, downloadable files
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| Liens | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
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| Année | 2011 |
| Éditeur | Ressources naturelles Canada |
| Réunion | Workshop on the role of geochemical data in environmental and human health risk assessment; Halifax; CA; mars 17-18, 2010 |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/287949 |
| Media | CD-ROM; en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Presentations
and recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010 |
| Référence reliée | Cette publication est reliée à North American
soil geochemical landscapes project: Canadian field protocols for collecting mineral soils and measuring soil gas radon and natural radioactivity |
| Formats | pdf |
| Province | Nouveau-Brunswick; Terre-Neuve-et-Labrador; Nouvelle-Écosse; Île-du-Prince-Édouard |
| SNRC | 1; 2; 10; 11; 12; 20; 21 |
| Lat/Long OENS | -70.0000 -52.0000 53.0000 43.0000 |
| Sujets | analyse 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; Santé humaine; géochimie; pédologie; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; Santé et sécurité;
Cénozoïque; Quaternaire |
| Programme | Géosciences environnementales |
| Diffusé | 2011 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 ID | 287949 |
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