PYROLUSITE SURFACE TRANSFORMATIONS MEASURED IN REAL-TIME DURING THE REACTIVE TRANSPORT OF CO(II)EDTA2- - THE EFFECT OF PH AND LIGHT

Show simple item record

dc.contributor.author Fendorf S.
dc.contributor.author Jardine P.M.
dc.contributor.author Patterson R.R.
dc.contributor.author Taylor D.L.
dc.contributor.author Brooks S.C.
dc.date.accessioned 2021-01-09T05:51:37Z
dc.date.available 2021-01-09T05:51:37Z
dc.date.issued 1999
dc.identifier https://elibrary.ru/item.asp?id=184842
dc.identifier.citation Geochimica et Cosmochimica Acta, 1999, , 19, 3049-3057
dc.identifier.issn 0016-7037
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/22508
dc.description.abstract Oxidation of Co(II)EDTA2- to Co(III)EDTA- by manganese and iron hydrous oxide minerals enhances the transport of 60Co in subsurface environments. Until now, reduction of the oxidant MnO2 has not been identified in hydrodynamic systems, leaving the fate and transport mechanisms involving 60Co in natural environments unresolved. We investigated the transport of Co(II)EDTA2- through packed beds of β-MnO2 and identified the reaction mechanism using a novel hydrodynamic flow cell coupled with X-ray absorption near edge structure (XANES) spectroscopy. Using this technique we are able to determine both solution and solid-phase species of cobalt and manganese in real-time. Co(II)EDTA2- is produced while Mn(IV) is reduced to Mn(III) which forms an α-Mn2O3layer on pyrolusite. This layer passivates the surface after an initial reaction period and ultimately limits the production of Co(III)EDTA-. As a consequence, the enhanced transport of 60Co by oxidative processes may be diminished by continual exposure to pyrolusite-an advantage from an environmental quality perspective. It has also been clarified that Mn(III) is formed rather than Mn(II) resulting in formation of a stable trivalent manganese solid (α-Mn2O3).
dc.title PYROLUSITE SURFACE TRANSFORMATIONS MEASURED IN REAL-TIME DURING THE REACTIVE TRANSPORT OF CO(II)EDTA2- - THE EFFECT OF PH AND LIGHT
dc.type Статья


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

  • ELibrary
    Метаданные публикаций с сайта https://www.elibrary.ru

Show simple item record