| Title | Analytical methods used to characterize the solid-phase speciation of metal(loid)s |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | 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; by Rencz, A N (ed.); Kettles, I M (ed.); Geological
Survey of Canada, Open File 6645, 2011 p. 21; 1 CD-ROM, https://doi.org/10.4095/287945  Open Access |
| Links | Canadian Database of Geochemical Surveys, downloadable
files
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| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
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| Year | 2011 |
| Publisher | Natural Resources Canada |
| Meeting | Workshop on the role of geochemical data in environmental and human health risk assessment; Halifax; CA; March 17-18, 2010 |
| Document | open file |
| Lang. | English |
| Media | CD-ROM; on-line; digital |
| Related | This publication is contained in Presentations and
recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010 |
| Related | This publication is related to North American soil
geochemical landscapes project: Canadian field protocols for collecting mineral soils and measuring soil gas radon and natural radioactivity |
| File format | pdf |
| Province | British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada |
| NTS | 1; 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 WENS | -141.0000 -50.0000 90.0000 41.7500 |
| Subjects | soils science; Health and Safety; environmental analysis; soil geochemistry; soils; soil studies; soil samples; soil properties; geochemical surveys; Human health; Cenozoic; Quaternary |
| Program | Environmental Geoscience |
| Released | 2011 01 01 |
| Abstract | 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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