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TitleSample "integrity" - an evaluation of sample variability of soils around Rouyn-Noranda, Quebec
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AuthorKnight, R D; Hernderson, P J
SourceGeological Survey of Canada, Scientific Presentation 46, 2017, 1 sheet, https://doi.org/10.4095/299343 (Open Access)
Image
Year2017
PublisherNatural Resources Canada
Meeting6th International Symposium on Environmental Geochemistry (ISEG); Edinburgh, Scotland; GB; September 7-11, 2003
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceQuebec; Ontario
NTS31M/05; 31M/06; 31M/07; 31M/08; 31M/09; 31M/10; 31M/11; 31M/12; 31M/13; 31M/14; 31M/15; 31M/16; 31N/05; 31N/12; 31N/13; 32C/04; 32C/05; 32C/12; 32C/13; 32D; 32E/01; 32E/02; 32E/03; 32E/04; 32F/04; 41P/07; 41P/08; 41P/09; 41P/10; 41P/15; 41P/16; 42A/01; 42A/02; 42A/07; 42A/08; 42A/09; 42A/10; 42A/15; 42A/16; 42B/01; 42B/02
AreaRouyn-Noranda; Lake Abitibi; Lake Duparquet; Lake Timiskaming
Lat/Long WENS -80.7500 -77.5000 49.2500 47.2500
Subjectsgeochemistry; environmental geology; soils science; sample preparation; soil samples; acidity; copper; lead; heavy metals geochemistry; heavy minerals; heavy minerals geochemistry; heavy metals contamination; heavy mineral analyses; smelters; geochemical analyses; till geochemistry; soil geochemistry; soil samples; soil types; soil studies; diamictites; Horne Smelter; humus
Illustrationslocation maps; tables; photographs; photomicrographs; cross-sections
ProgramRegional Geology & Geochemistry, GSC Northern Canada Division
ProgramMetals in the Environment (MITE)
Released2017 01 12
AbstractA detailed soil sample collection grid was established 3 km southwest of the Horne smelter at Rouyn - Noranda, Quebec. The work supports interpretation of a regional geochemical survey of humus and soil within 100 km radius of the smelter and was designed to determine geochemical variability at a site affected by smelter particulate deposition. Soils in the grid are luvisols formed on glacial lake silts and clays and overly pillowed volcanic bedrock. Vegetation comprises small poplars and alders, with a fern ground cover; carbonized stumps and a thin layer of charcoal beneath humus indicate the site has been subject to fire. Litterfall, humus, and B-horizon soil samples were collected at 10, 20, and 30m from the intersection of two perpendicular transects and at a point halfway between the 30m sample locations. Three samples of each were collected at the point of intersection. C-horizon soil was collected at the intersection, the 30m sites, and halfway between the 30m sample locations In preparation for ICP-AES geochemical analyses, litterfall and humus samples were macerated, and all samples sieved to <2mm. The litterfall samples were digested using perchloric acid, and all other samples using aqua-regia. The B- and C-horizon soil samples were analysed in duplicate. A total of 48 analyses were carried out.
Geochemical variation among litterfall, B-horizon, and C-horizon samples lies within the range of analytical variation, and trace metal concentrations (Cu, Pb, Zn, Ni, Cr) are 10s to 100s of ppm. For non-smelter-related elements, such as Ni, humus concentrations are equivalent to those of C-horizon soil. For Cr, humus values are lower than those of C-horizon soil. In contrast, smelter-related elements, Cu, Pb, and Zn, have humus concentrations that are 1000's of ppm, and range within a variability of several 1000 ppm across the site.
Humus geochemistry reflects non-uniform distribution of metal-rich smelter particulate, and indicates that site variability is an important factor in mapping the distribution of smelter particulate and in modeling deposition.
Summary(Plain Language Summary, not published)
In order to test sample integrity near a point source, a detailed soil sample collection site was established close the Horne smelter located at Rouyn - Noranda, Quebec. We conclude that Humus geochemistry reflects non-uniform distribution of metal-rich smelter particulate, and indicates that site variability is an important factor in mapping the distribution of smelter particulates and in modeling particulate deposition.
GEOSCAN ID299343