SURFACE CHEMISTRY OF DISORDERED MACKINAWITE (FES)
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dc.contributor.author | Wolthers M. | |
dc.contributor.author | van Der Weijden C.H. | |
dc.contributor.author | Charlet L. | |
dc.contributor.author | van Der Linde P.R. | |
dc.contributor.author | Rickard D. | |
dc.date.accessioned | 2023-12-23T04:12:20Z | |
dc.date.available | 2023-12-23T04:12:20Z | |
dc.date.issued | 2005 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=31289302 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2005, 69, 14, 3469-3481 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/42387 | |
dc.description.abstract | Disordered mackinawite, FeS, is the first formed iron sulfide in ambient sulfidic environments and has a highly reactive surface. In this study, the solubility and surface chemistry of FeS is described. Its solubility in the neutral pH range can be described by Ksapp = {Fe2+ · {H2S(aq)} · {H+}-2 = 10+4.87±0.27. Acid-base titrations show that the point of zero charge (PZC) of disordered mackinawite lies at pH ~7.5. The hydrated disordered mackinawite surface can be best described by strongly acidic mono-coordinated and weakly acidic tricoordinated sulfurs. The mono-coordinated sulfur site determines the acid-base properties at pH < PZC and has a concentration of 1.2 × 10-3 mol/g FeS. At higher pH, the tricoordinated sulfur, which has a concentration of 1.2 × 10-3 mol/g FeS, determines surface charge changes. Total site density is 4 sites nm-2. The acid-base titration data are used to develop a surface complexation model for the surface chemistry of FeS. Copyright © 2005 Elsevier Ltd. | |
dc.subject | mackinawite | |
dc.title | SURFACE CHEMISTRY OF DISORDERED MACKINAWITE (FES) | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2005.01.027 |
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