WOLTHERS, M;
BUTLER, I;
RICKARD, D;
(2007)
Influence of arsenic on iron sulfide transformations.
Chemical Geology
, 236
(3-4)
217 - 227.
10.1016/j.chemgeo.2006.09.010.
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Abstract
The association of arsenate, As(V), and arsenite, As(III), with disordered mackinawite, FeS, was studied in sulfide-limited (Fe:S = 1:1) and excess-sulfide (Fe:S = 1:2) batch experiments. In the absence of arsenic, the sulfide-limited experiments produce disordered mackinawite while the excess-sulfide experiments yield pyrite with trace amounts of mackinawite. With increasing initially added As(V) concentrations the transformation of FeS to mackinawite and pyrite is retarded. At S:As = 1:1 and 2:1, elemental sulfur and green rust are the end products. As(V) oxidizes S(-II) in FeS and (or) in solution to S(0), and Fe(II) in the solid phase to Fe(III). Increasing initially added As(III) concentrations inhibit the transformation of FeS to mackinawite and pyrite and no oxidation products of FeS or sulfide, other than pyrite, were observed. At low arsenic concentrations, sorption onto the FeS surface may be the reaction controlling the uptake of arsenic into the solid phase. Inhibition of iron(II) sulfide transformations due to arsenic sorption suggests that the sorption sites are crucial not only as sorption sites, but also in iron(II) sulfide transformation mechanisms.
| Type: | Article |
|---|---|
| Title: | Influence of arsenic on iron sulfide transformations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.chemgeo.2006.09.010 |
| Publisher version: | http://dx.doi.org/10.1016/j.chemgeo.2006.09.010 |
| Language: | English |
| Additional information: | © 2007 Elsevier. This is an author's manuscript version of the article. The final publishers version of this article is available at http://dx.doi.org/10.1016/j.chemgeo.2006.09.010 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1397005 |
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