| Titre | Analytical methods used to characterize the solid-phase speciation of metal(loid)s |
| Télécharger | Téléchargement (publication entière) |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Parsons, M B |
| 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. 21; 1 CD-ROM, https://doi.org/10.4095/287945  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/10.4095/287945 |
| 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 | Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon; Nunavut;
Canada |
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| Lat/Long OENS | -141.0000 -50.0000 90.0000 41.7500 |
| Sujets | analyse environnementales; géochimie du sol; sols; études pédologiques; échantillons de sol; propriétés du sol; levés géochimiques; Santé humaine; pédologie; Santé et sécurité; Cénozoïque;
Quaternaire |
| Programme | Géosciences environnementales |
| Diffusé | 2011 01 01 |
| Résumé | (disponible en anglais seulement)
The ecosystem and human health risks associated with metal(loid)s in soils, sediments and mine wastes are strongly influenced by their solid-phase speciation.
This presentation will review a range of methods commonly used by geoscientists to measure the various chemical (e.g. oxidation state) and physical (e.g. morphology, particle size) forms of an element which together make up the total concentration of
that element in a sample. Traditional macroscopic techniques for determining solid-phase speciation include methods such as sequential chemical extractions, which can be used for indirectly assessing the partitioning of metals in solid materials, and
X-ray diffraction (XRD), which can be used to identify crystalline phases. Microscopic methods range from optical techniques (e.g. transmitted and reflected light microscopy) to microbeam methods that are used to determine near-surface compositions
(e.g. electron microprobe, laser-ablation ICP-MS, proton-induced X-ray emission (PIXE)). Over the last two decades, many environmental investigations have employed synchrotronbased microscopic methods that can be used to determine the in situ
speciation of metal(loid)s in solid materials. With careful sample collection and preparation, techniques such as X-ray absorption fine structure spectroscopy (XAFS) can provide information on metal(loid) oxidation states and coordination
environments that are essential for assessing the environmental risks associated with these elements. Recent studies demonstrate that determination of the total concentrations of metal(loid)s in soils, sediments and mine wastes does not give
sufficient information on the environmental availability of these elements, or their potential risks to human health. In the future, ecological and human health risk assessments should incorporate information on the solid-phase speciation of
metal(loid)s to ensure that realistic management guidelines are established. |
| GEOSCAN ID | 287945 |
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