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001     53450
005     20190625111459.0
024 7 _ |2 DOI
|a 10.1021/es040069x
024 7 _ |2 WOS
|a WOS:000226712600030
024 7 _ |a 0013-936X
|2 ISSN
024 7 _ |2 ISSN
|a 1520-5851
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|2 altmetric
037 _ _ |a PreJuSER-53450
041 _ _ |a eng
082 _ _ |a 050
084 _ _ |2 WoS
|a Engineering, Environmental
084 _ _ |2 WoS
|a Environmental Sciences
100 1 _ |a Rennert, T.
|b 0
|0 P:(DE-HGF)0
245 _ _ |a Oxidation of Ferrocyanide by Birnessite
260 _ _ |c 2005
|a Columbus, Ohio
|b American Chemical Society
300 _ _ |a 821 - 825
336 7 _ |a Journal Article
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|2 PUB:(DE-HGF)
336 7 _ |a Output Types/Journal article
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
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336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a article
|2 DRIVER
440 _ 0 |a Environmental Science and Technology
|x 0013-936X
|0 1865
|v 39
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a The Fe-CN complexes ferrocyanide, [Fe-II(CN)(6)](4-), and ferricyanide, [Fe-III(CN)(6)](3-), which are contaminants in soil and groundwater, form a redox couple, [Fe-II(CN)(6)](4-) reversible arrow [Fe-III(CN)(6)](3-) + e(-), E-H = 356 mV. We studied the oxidation of [Fe-II(CN)(6)](4-) by birnessite, delta-(MnO2)-O-IV, in batch experiments as influenced by [Fe-II(CN)(6)](4-) concentration, pH, and reaction time. Additionally, stopped-flow experiments were carried out at five temperatures (10-30 degreesC) and four pH values (pH 4.1-5.3). In the batch experiments, [Fe-II(CN)(6)](4-) was completely oxidized to [Fe-III(CN)(6)](3-), and oxidation did neither depend on time for t > 2 min, nor on concentration (0.12-0.47 mM), nor on pH (pH 3.3-9.9). Lasting adsorption of Fe-CN complexes on the birnessite surface or precipitation of manganese ferricyanide were not detected. Manganous ions resulting from the reductive dissolution of birnessite did not precipitate as manganese oxide because an identical decrease of Mn solution concentrations was observed under air and under a N-2 atmosphere. Two processes were detected by the stopped-flow experiments. The first rapid one with an activation energy of approximately 60 kJ mol(-1) was attributed to short-term adsorption and simultaneous oxidation of [Fe-II(CN)(6)](4-) on the birnessite surface. The second slower process with an activation energy of approximately 20 kJ mol(-1) was attributed most probably to diffusion of the reaction product Mn2+ into the interior of the birnessite, which creates fresh reaction sites at the outer surface.
536 _ _ |a Chemie und Dynamik der Geo-Biosphäre
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588 _ _ |a Dataset connected to Web of Science
650 _ 7 |a J
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700 1 _ |a Pohlmeier, A.
|b 1
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700 1 _ |a Mansfeld, T.
|b 2
|0 P:(DE-HGF)0
773 _ _ |0 PERI:(DE-600)1465132-4
|a 10.1021/es040069x
|g Vol. 39, p. 821 - 825
|p 821 - 825
|q 39<821 - 825
|t Environmental Science & Technology
|v 39
|x 0013-936X
|y 2005
909 C O |o oai:juser.fz-juelich.de:53450
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913 1 _ |k U01
|v Chemie und Dynamik der Geo-Biosphäre
|l Chemie und Dynamik der Geo-Biosphäre
|b Environment (Umwelt)
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914 1 _ |a Nachtrag
|y 2005
915 _ _ |a JCR/ISI refereed
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|b Thomson Reuters Master Journal List
920 1 _ |k ICG-IV
|l Agrosphäre
|d 31.12.2006
|g ICG
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970 _ _ |a VDB:(DE-Juel1)83978
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981 _ _ |a I:(DE-Juel1)IBG-3-20101118

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