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• W2059654323 abstract "We used a mixed flow reactor system to determine the rate and infer a mechanism for arsenopyrite (FeAsS) oxidation by dissolved oxygen (DO) at 25 °C and circumneutral pH. Results indicate that under circumneutral pH (6.3–6.7), the rate of arsenopyrite oxidation, 10−10.14±0.03 mol m−2 s−1, is essentially independent of DO over the geologically significant range of 0.3–17 mg L−1. Arsenic and sulfur are released from arsenopyrite in an approximate 1:1 molar ratio, suggesting that oxidative dissolution by oxygen under circumneutral pH is congruent. Slower rates of iron release from the reactor indicate that some of the iron is lost from the effluent by oxidation to Fe(III) which subsequently hydrolyzes and precipitates. Using the electrochemical cell model for understanding sulfide oxidation, our results suggest that the rate-determining step in arsenopyrite oxidation is the reduction of water at the anodic site rather than the transfer of electrons from the cathodic site to oxygen as has been suggested for other sulfide minerals such as pyrite." @default.
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• W2059654323 date "2006-04-01" @default.
• W2059654323 modified "2023-10-16" @default.
• W2059654323 title "Kinetics of arsenopyrite oxidative dissolution by oxygen" @default.
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• W2059654323 doi "https://doi.org/10.1016/j.gca.2005.12.010" @default.
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