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Quantification of metals and semi-metals in carbon-rich rocks : a new sequential protocol including extraction from humic substances

Henrique-Pinto Renato, Barnes Sarah-Jane, Savard Dany et Mehdi Sadia. (2015). Quantification of metals and semi-metals in carbon-rich rocks : a new sequential protocol including extraction from humic substances. Geostandards and Geoanalytical Research, n/a-n/a.

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URL officielle: http://dx.doi.org/10.1111/j.1751-908X.2015.00340.x

Résumé

We have developed a new sequential extraction technique that does not require complex procedures and is efficient in determining metal and semi-metal contents of carbon-rich rocks. Six international geological reference materials (SBC-1, SCHS-1, SCo-1, SDO-1, SGR-1b and SLg-1) and an in-house black shale (SH-1) were selected to test the method, which consists of four main digestion steps involving: (1) dilute HCl acid; (2) NaOH; (3) aqua regia and (4) hydrofluoric acid. Compared with traditional aqua regia + hydrofluoric acid attack, this new protocol recovers more of the moderately volatile elements during early extraction of humic substances. In addition when compared with reference values, those for most elements are in agreement within uncertainty. Furthermore, this new protocol reveals important information on the partitioning of elements; for instance steps one and two indicate which elements are associated with carbonates and organic phases from fulvic and humic acid extractions, whereas step three provides results for which elements are associated with sulfide minerals and step four indicates which elements remained in the silicates and oxides mineral phases.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1751-908X
Pages:n/a-n/a
Version évaluée par les pairs:Oui
Date:2015
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:humic substances, metalliferous black shales, metals, semi-metals
Informations complémentaires:Aucun volume ni numéro mentionné pour la publication entière.
Déposé le:10 juin 2016 13:06
Dernière modification:09 déc. 2016 14:49
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