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TitleEffects of sample drying on phase distribution of elements in lake-sediment cores
DownloadFree download (whole publication) (zip 212296 KB)
AuthorHall, G E M; Vaive, J E; Pelchat, P; Bonham-Carter, G F; Kliza, D A; Telmer, K
SourceMetals in the environment around smelters at Rouyn-Noranda, Quebec, and Belledune, New Brunswick: Results and conclusions of the GSC MITE Point Sources Project; by Bonham-Carter, G; Geological Survey of Canada, Bulletin no. 584, 2005, 18 pages; 1 CD-ROM, https://doi.org/10.4095/221164
Year2005
PublisherNatural Resources Canada
Documentserial
Lang.English
MapsPublication contains 1 map
Map Info.surficial geology, 1:250,000
MediaCD-ROM; digital; on-line
RelatedThis publication is contained in Bonham-Carter, G; (2005). Metals in the environment around smelters at Rouyn-Noranda, Quebec, and Belledune, New Brunswick: results and conclusions of the GSC MITE Point Sources Project, Geological Survey of Canada, Bulletin no. 584
File formatreadme / lisez-moi
File formataep (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); apr (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); avl (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); bmp; dbf (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); dmg (Adobe Acrobat Reader v.6.0 is included / est fourni); doc (Microsoft Word); e00 (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); fpt (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); gif; htm; jpg; pdf (Adobe Acrobat Reader v.6.0 is included / est fourni); pdx (Adobe Acrobat Reader v.6.0 is included / est fourni); prj (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); sbn (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); sbx (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); shp (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); txt; xls (Microsoft Excel); xml; pdf
Subjectsgeochemistry; environmental geology; chemical analysis; leaching; phase relations; sample preparation; lake sediment cores; oxides; crystalline phases; element distribution; iron; sulphur; oxidation; mass spectrometer analysis; geochemical dispersion; calcium; magnesium; manganese; lanthanum; rubidium; vanadium; bismuth; redistribution; methods
Illustrationstables; geochemical profiles
ProgramMetals in the Environment (MITE)
LinksMetadata
LinksMétadonnées
Released2005 12 22
AbstractThe application of a sequential extraction scheme provides information on the phase association of elements in a sample, such phases being described, for example, as 'exchangeable/adsorbed', 'amorphous Fe/Al oxides', and 'soluble organics'. It is therefore critical to maintain the chemistry of a sample from the time of collection to its analysis and during its preparation for analysis. This paper focuses on the redistribution of elements amongst five operationally defined phases that occurs on air drying of the sample. Two lake-sediment cores ('Green' and 'Gravel Pit' lakes) were sampled at 1 cm intervals and divided into two sets immediately prior to sequential leach analysis of the 'wet' sample; the other set was air dried. Most of the 39 elements determined in the 'Green' Lake sediment showed, on drying, a redistribution to more labile forms, such as Fe where increases in the oxide phases were observed with a concomitant decrease in the crystalline forms of Fe reporting to the final aqua regia digestion. These changes are generally small in magnitude, but they can change the shape of the element profile down the core for an affected leach, which in turn could lead to misinterpretation of the sequential leach data. Surprisingly, S did not show any changes on drying, suggesting that the kinetics of oxidation are reasonably slow and that storage of the sample is more important to avoid than drying. The different behaviour shown by the two cores indicates that redistribution of elements on sample drying is both element- and matrix-dependent.
GEOSCAN ID221164