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TitreAssessment of cleaning methods for electro-welded sieves to reduce/eliminate carry over contamination between till samples
TéléchargerTéléchargements
AuteurGrenier, A; Connell-Madore, S; McClenaghan, M B; Wygergangs, M; Moore, C S
SourceCommission géologique du Canada, Dossier public 7769, 2015, 24 pages, https://doi.org/10.4095/296314
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/296314
Mediaen ligne; numérique
Liensreadme
Formatspdf; xls
Sujetsnormes relatives au matériel; essai de matériel; méthodes analytiques; preparation d'échantillons; divers
Illustrationstables; photographs; flow charts; location maps; histograms
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeNord-est du Québec-Labrador, géologie des dépôts meubles de la région d'Hudson/Ungava, GEM2 : La géocartographie de l'énergie et des minéraux
Diffusé2015 06 18
Résumé(disponible en anglais seulement)
The Sedimentology Lab, with the support of the Geo-mapping for Energy and Minerals (GEM) and Targeted Geoscience Initiative (TGI4) Programs, set out to verify existing sieve cleaning methods used in geological sample preparation laboratories to ensure no cross contamination between samples. Three cleaning methods were tested using till samples with varying degrees of mineralization.
The purpose of this study is to determine the effectiveness of commonly used cleaning methods at preventing cross contamination while sieving. This is critical to the quality of the geochemical analysis. Cleaning Method 1, while the quickest, does not remove contamination effectively for the two deposits sampled for this study. The addition of an extra step in Method 2 lowered the level of the potential contaminants without significant time increase. If known high mineralization exists, cleaning Method 3 is recommended otherwise Method 2 should be sufficient.
In addition to sample preparation it would be a good practice, when submitting samples to be processed for geochemical analysis, to provide a processing order to the laboratory if they are aware of any potentially metal-rich samples. Metal-rich samples should be positioned at the end of the list to avoid any possible contamination due to sample preparation or analytical memory effect. Clean silica blanks should be inserted at the start of the batch and sieved blanks should be inserted to verify possible contamination in the preparation lab. The insertion of control reference materials (CRMs) and duplicates are also recommended for quality control.
Résumé(Résumé en langage clair et simple, non publié)
Présentation de données concernant l'efficacité de différentes techniques pour nettoyer les tamis avant le tamisage d'échantillons de till aux fins d'analyses géochimiques. Les résultats démontrent une contamination des échantillons till pauvres en métaux lorsque préparé après des échantillons de till riches en métaux.
GEOSCAN ID296314