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The production of methyl Hg by anaerobic bacteria may be limited in anoxic sediments by the sequestration of divalent Hg [Hg(II)] into a solid phase or by the formation of elemental Hg [Hg(0)]. We tested the hypothesis that nanocrystalline mackinawite (tetragonal FeS), which is abundant in sediments where Hg is methylated, both sorbs and reduces Hg(II). Mackinawite suspensions were equilibrated with dissolved Hg(II) in batch reactors. Examination of the solid phase using Hg LIII-edge extended X-ray absorption fine structure (EXAFS) spectroscopy showed that Hg(II) was indeed reduced in FeS suspensions. Measurement of purgeable Hg using cold vapor atomic fluorescence spectrometry (CVAFS) from FeS suspensions and control solutions corroborated the production of Hg(0) that was observed spectroscopically. However, a fraction of the Hg(II) initially added to the suspensions remained in the divalent state, likely in the form of \u03b2-HgS-like clusters associated with the FeS surface or as a mixture of \u03b2-HgS and surface-associated species. Complexation by dissolved S(-II) in anoxic sediments hinders Hg(0) formation, but, by contrast, Hg(II)\u2013S(-II) species are reduced in the presence of mackinawite, producing Hg(0) after only 1 h of reaction time. The results of our work support the idea that Hg(0) accounts for a significant fraction of the total Hg in wetland and estuarine sediments.<\/jats:p>","DOI":"10.1021\/es501514r","type":"journal-article","created":{"date-parts":[[2014,8,16]],"date-time":"2014-08-16T10:24:12Z","timestamp":1408184652000},"page":"10681-10689","source":"Crossref","is-referenced-by-count":89,"title":["Mackinawite\n(FeS) Reduces Mercury(II) under Sulfidic\nConditions"],"prefix":"10.1021","volume":"48","author":[{"given":"Sharon E.","family":"Bone","sequence":"first","affiliation":[{"name":"University of California , , , ,","place":["Berkeley, California, United States, 94720"]},{"name":"Lawrence Berkeley National Laboratory , , , ,","place":["Berkeley, California, United States, 94720"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John R.","family":"Bargar","sequence":"additional","affiliation":[{"name":"Stanford Synchrotron Radiation Lightsource, SLAC , 2575 Sand Hill Road , , ,","place":["Menlo Park, California, United States, 94025"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Garrison","family":"Sposito","sequence":"additional","affiliation":[{"name":"University of California , , , ,","place":["Berkeley, California, United States, 94720"]},{"name":"Lawrence Berkeley National Laboratory , , , ,","place":["Berkeley, California, United States, 94720"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2014,8,16]]},"reference":[{"issue":"1","key":"2026090303250819100_cit1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1021\/es970284w","article-title":"The case for atmospheric\nmercury contamination in remote areas","volume":"32","author":"Fitzgerald","year":"1998","journal-title":"Environ.\nSci. 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Technol."},{"key":"2026090303250819100_cit4","first-page":"155","article-title":"Microbial\ntransformations in\nthe mercury cycle","volume-title":"Environmental Chemistry\nand Toxicology of Mercury","author":"Lin","year":"2012"},{"issue":"11","key":"2026090303250819100_cit5","doi-asserted-by":"publisher","first-page":"4267","DOI":"10.1016\/j.envpol.2007.12.004","article-title":"Effects\nof dissolved organic carbon\nand salinity on bioavailability of mercury","volume":"63","author":"Barkay","year":"1997","journal-title":"Appl. Environ. Microbiol."},{"issue":"6","key":"2026090303250819100_cit6","doi-asserted-by":"publisher","first-page":"951","DOI":"10.1021\/es9808200","article-title":"Sulfide controls on\nmercury speciation and bioavailability to methylating bacteria in\nsediment pore waters","volume":"33","author":"Benoit","year":"1999","journal-title":"Environ. Sci. 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