Arsenic speciation and bioaccessibility in gold mining tailings, Cuba

Guilherme, L. R. G. and Toujaguez, R. and Ono, F. B. and Martins, V. and Cabrera, P. P. and Blanco, A. V. and Bundschuh, J. (2012) Arsenic speciation and bioaccessibility in gold mining tailings, Cuba. In: 4th International Congress on Arsenic in the Environment: Understanding the Geological and Medical Interface of Arsenic (AS 2012), 22-27 Jul 2012, Cairns, Australia.

Abstract

A previous risk assessment identified arsenic (As) as the main critical contaminant in a former gold mining area in Delita, Cuba. This study aimed at: i) evaluating As bioaccessibility in four tailings from a mining area; and, ii) identifying the mineral phases responsible for As bioaccessibility using XRD, SEM-EDS and XAS. The results showed that bioaccessible As in the tailings ranged from 0.65 to 40.5%. Although arsenopyrite, beudantite and other minerals were confirmed by petrography, XRD and SEM-EDS, XANES analyses indicated that scorodite phases and As5+ were dominant in most of the tailings. This confirms that the low As bioaccessibility in the most of piles is due to the slow kinetics of As release from scorodite.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
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Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 02 May 2013 23:43
Last Modified: 10 Apr 2017 01:27
Uncontrolled Keywords: arsenic bioaccessibility; gold mining; tailings; Cuba
Fields of Research : 04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry
05 Environmental Sciences > 0502 Environmental Science and Management > 050209 Natural Resource Management
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
Socio-Economic Objective: D Environment > 96 Environment > 9605 Ecosystem Assessment and Management > 960508 Ecosystem Assessment and Management of Mining Environments
URI: http://eprints.usq.edu.au/id/eprint/22909

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