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TitreBiogeochemical variation and ecological and human health risk assessment
TéléchargerTéléchargement (publication entière)
AuteurRencz, A N
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. 17; 1 CD-ROM, https://doi.org/10.4095/287941
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/10.4095/287941
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
ProvinceColombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon; Nunavut
SNRC1; 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 OENS-141.0000 -50.0000 90.0000 41.7500
Sujetsanalyse environnementales; etudes de l'environnement; effets sur l'environnement; géochimie du sol; sols; contamination des métaux lourds; pollution; substances polluantes; biogéochimie; levés biochimiques; levés géochimiques; géochimie; géologie de l'environnement; Cénozoïque; Quaternaire
Illustrationsschematic diagrams
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
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Diffusé2011 01 01
Résumé(disponible en anglais seulement)
An ecosystem is composed of various biotic and abiotic components. Although they are connected, each has a unique chemical signature that can characterize that component. The risk assessor is faced with the option of selecting for study and sampling one or more types of media type to characterize the ecosystem of interest. It should be appreciated that although the components are linked and elements flow from one system to another, there is not necessarily a strong correlation between the distribution patterns of elements in one pool and those in another. The distribution of elements in the different media reflects complex interactions between the different components of the ecosystem and the factors that control them ( soil pH, eH, and the content of organic matter). In addition, the levels of element concentration in biological systems are affected by seasonal variations and by the adaptive mechanisms of biota that allow them to maximize their competitive advantage (certain plants are bio-accumulators of specific elements).
The risk assessor should consider the variation inherent in each of the media types that is being sampled. For example, within one tree species there are different tissue types (eg. leaf, bark, woody layer) and there may be up to a magnitude of difference in the concentration of elements from one type of tissue to the next (e.g. Ni in sugar maples). Hence, if data from more than one type of tissue are compared, the result may show variation in element concentrations that are not realistic.
This workshop focuses on soils and the inherent differences that affect the concentration of metals in soils. Soils have properties that make them a useful sample media for risk assessment. They are present in most places and readily acessible, the seasonal fluctuations in their chemistry are not significant, and they are directly linked to biological uptake. There is variation in the element content of soils with increasing depth caused by the soilforming processes and horizon development. However, if samples are collected from similar pedologic horizons, the origin of the differences tends to be more easily explained.
GEOSCAN ID287941