The role of rainwater-borne hydrogen peroxide in the release of arsenic from arsenopyrite

Ma, Yingqun and Qin, Yanwen and Lin, Chuxia (2014) The role of rainwater-borne hydrogen peroxide in the release of arsenic from arsenopyrite. Chemosphere, 103. pp. 349-353. ISSN 0045-6535

Abstract

A microcosm experiment was conducted to examine the effects of hydrogen peroxide (at a concentration range of 5-50 μM) on the release of arsenic from the dissolution of arsenopyrite, a dominant arsenic-bearing mineral occurring in natural environments. This was to simulate the reaction between rainwater-borne hydrogen peroxide and arsenopyrite grains exposed on the land surfaces during rainfall events. The results showed that the release of arsenic from arsenopyrite was enhanced by the H2O2 at this concentration range. It was also evident that H2O2 played an indirect role in the transformation of arsenite into arsenate in the solutions, which might affect the fate of the liberated arsenic species due to the formation of FeAsO4 precipitates. The preliminary study sheds some light on the possible role of rainwater-borne H2O2 in the weathering of arsenopyrite, which could complicate the geochemical processes governing the release, transport and fate of arsenopyrite-derived arsenic in natural environments. This provides a rationale for conducting additional laboratory-based investigations to obtain further insights into the chemical mechanisms and kinetics, and the subsequent field-scale study to validate the research findings.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 Elsevier Ltd. All rights reserved. Published online 5 Dec 2013. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - USQ Other
Date Deposited: 11 Dec 2013 05:11
Last Modified: 22 Sep 2017 01:24
Uncontrolled Keywords: arsenate; arsenite; arsenopyrite; Fenton reaction; hydrogen peroxide; rainwater
Fields of Research : 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology
04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry
04 Earth Sciences > 0403 Geology > 040306 Mineralogy and Crystallography
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970104 Expanding Knowledge in the Earth Sciences
Identification Number or DOI: 10.1016/j.chemosphere.2013.11.021
URI: http://eprints.usq.edu.au/id/eprint/24365

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