Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions
The potentially toxic Fe-CN complexes ferricyanide, [FeIII(CN)6]3−, and ferrocyanide, [FeII(CN)6]4−, undergo a variety of redox processes in soil, which affect their mobility. We carried out microcosm experiments with suspensions of a humic topsoil (pH 5.3; Corg...
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| Format: | Article |
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Wiley
2009-01-01
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| Series: | Applied and Environmental Soil Science |
| Online Access: | http://dx.doi.org/10.1155/2009/857640 |
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| author | Thilo Rennert Tim Mansfeldt |
| author_facet | Thilo Rennert Tim Mansfeldt |
| author_sort | Thilo Rennert |
| collection | DOAJ |
| description | The potentially toxic Fe-CN complexes ferricyanide,
[FeIII(CN)6]3−, and ferrocyanide, [FeII(CN)6]4−, undergo a variety of redox processes in soil, which affect their mobility. We carried out microcosm experiments with suspensions of a humic topsoil
(pH 5.3; Corg 107 g kg-1) to which we added ferricyanide (20 mg l-1). We varied the redox potential
(EH) from −280 to 580 mV by using O2, N2 and glucose. The decrease of EH led to decreasing concentrations of Fe-CN complexes and partial reductive dissolution of (hydrous) Fe and Mn oxides. The dynamics of aqueous Fe-CN concentrations was characterized by decreasing concentrations when
the pH rose and the EH dropped. We attribute these dependencies to adsorption on organic surfaces,
for which such a pH/EH behavior has been shown previously. Adsorption was reversible, because when the pH and EH changed into the opposite direction, desorption occurred. This study demonstrates
the possible impact of soil organic matter on the fate of Fe-CN complexes in soil. |
| format | Article |
| id | doaj-art-174d3a35fed7455ba6433df5bfbda932 |
| institution | Kabale University |
| issn | 1687-7667 1687-7675 |
| language | English |
| publishDate | 2009-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Applied and Environmental Soil Science |
| spelling | doaj-art-174d3a35fed7455ba6433df5bfbda9322025-02-03T06:14:08ZengWileyApplied and Environmental Soil Science1687-76671687-76752009-01-01200910.1155/2009/857640857640Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox ConditionsThilo Rennert0Tim Mansfeldt1Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Burgweg 11, 07749 Jena, GermanyGeographisches Institut, Universität zu Köln, Albertus-Magnus-Platz, 50923 Köln, GermanyThe potentially toxic Fe-CN complexes ferricyanide, [FeIII(CN)6]3−, and ferrocyanide, [FeII(CN)6]4−, undergo a variety of redox processes in soil, which affect their mobility. We carried out microcosm experiments with suspensions of a humic topsoil (pH 5.3; Corg 107 g kg-1) to which we added ferricyanide (20 mg l-1). We varied the redox potential (EH) from −280 to 580 mV by using O2, N2 and glucose. The decrease of EH led to decreasing concentrations of Fe-CN complexes and partial reductive dissolution of (hydrous) Fe and Mn oxides. The dynamics of aqueous Fe-CN concentrations was characterized by decreasing concentrations when the pH rose and the EH dropped. We attribute these dependencies to adsorption on organic surfaces, for which such a pH/EH behavior has been shown previously. Adsorption was reversible, because when the pH and EH changed into the opposite direction, desorption occurred. This study demonstrates the possible impact of soil organic matter on the fate of Fe-CN complexes in soil.http://dx.doi.org/10.1155/2009/857640 |
| spellingShingle | Thilo Rennert Tim Mansfeldt Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions Applied and Environmental Soil Science |
| title | Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions |
| title_full | Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions |
| title_fullStr | Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions |
| title_full_unstemmed | Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions |
| title_short | Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions |
| title_sort | mobility of iron cyanide complexes in a humic topsoil under varying redox conditions |
| url | http://dx.doi.org/10.1155/2009/857640 |
| work_keys_str_mv | AT thilorennert mobilityofironcyanidecomplexesinahumictopsoilundervaryingredoxconditions AT timmansfeldt mobilityofironcyanidecomplexesinahumictopsoilundervaryingredoxconditions |