PMID: 18409625Apr 16, 2008Paper

Selenite reduction by mackinawite, magnetite and siderite: XAS characterization of nanosized redox products

Environmental Science & Technology
Andreas C Scheinost, Laurent Charlet

Abstract

Suboxic soils and sediments often contain the Fe(II)-bearing minerals mackinawite (FeS), siderite (FeCO3) or magnetite (FesO4), which should be able to reduce aqueous selenite, thereby forming solids of low solubility. While the reduction of selenate or selenite to Se(O) by green rust, pyrite and by Fe2+ sorbed to montmorillonite is a slow (weeks), kinetically limited redox reaction as demonstrated earlier, we show here that selenite is rapidly reduced within one day by nanoparticulate mackinawite and magnetite, while only one third of selenite is reduced by micrometer-sized siderite. Depending on Fe(II)-bearing phase and pH, we observed four different reaction products, red and gray elemental Se, and two iron selenides with structures similar to Fe7Se8 and FeSe. The thermodynamically most stable iron selenide, ferroselite (FeSe2), was not observed. The local structures of the reaction products suggest formation of nanoscale clusters, which may be prone to colloid-facilitated transport, and may have a higher than expected solubility.

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Citations

Sep 17, 2013·Water Research·Kitae BaekAkram Alshawabkeh
Mar 20, 2012·Environmental Science & Technology·Laurent CharletFanrong Chen
Sep 8, 2012·Environmental Science & Technology·V BadautG Moutiers
Feb 5, 2013·Environmental Science & Technology·Harish VeeramaniMichael F Hochella
Oct 24, 2013·Environmental Science & Technology·Siriwan DulneeAndreas C Scheinost
Jun 16, 2014·Journal of Hazardous Materials·Bin MaChunli Liu
Jan 29, 2013·Journal of Hazardous Materials·Mingliang KangLaurent Charlet
Feb 5, 2013·Chemical Engineering Journal·Kitae BaekAkram N Alshawabkeh
Jun 3, 2014·Environmental Science & Technology·Dimin FanMark E Bowden
Nov 4, 2008·Journal of Contaminant Hydrology·Andreas C ScheinostLaurent Charlet
Mar 25, 2016·Journal of Contaminant Hydrology·Nicolas Finck, Kathy Dardenne
Aug 25, 2015·Environmental Science & Technology·Heather K ShrimptonCarol J Ptacek
May 11, 2015·Journal of Contaminant Hydrology·Siriwan Dulnee, Andreas C Scheinost
Sep 24, 2013·Journal of Environmental Radioactivity·Min Hoon BaikJongtae Jeong
Aug 1, 2013·Water Research·Liping LiangXiangzi Zhang
Oct 25, 2014·Environmental Science and Pollution Research International·Elisabeth Eiche
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Jun 19, 2021·Chemical Reviews·Jianzhi HuangHuichun Zhang

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