Floodplain soils at the Elbe river, Germany, and their diverse microbial biomass

Rinklebe, Jörg; Langer, Uwe

doi:10.1080/03650340701661206

Cited by 23 publications

(3 citation statements)

References 71 publications

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“…In general, organic carbon affects the amount of reducing substances either directly or indirectly, since it is the principal source of electrons in soils and can produce reducing substances during its decomposition (Chang‐Pu and Zhi‐Guang, 1985). During the first 20 to 30 d, Mn and Fe release was inhibited, which may have two reasons: (i) a certain time span is needed to reestablish facultative anaerobe and anaerobe microorganisms after watering of soil (Rinklebe and Langer, 2006, 2008; Langer and Rinklebe, 2009); or (ii) the presence of high Cr(VI) concentrations inhibit the release of Mn and Fe, while the E H is controlled by CrO 4 2− /Cr 2 O 3 (s), or CrO 4 2− /(Fe,Cr)OOH redox couples (Couture et al, 2015). Chromate/Cr(III) has a high standard electrode potential (Supplemental Table S1) and, thus, a high oxidation potential.…”

Section: Discussionmentioning

confidence: 99%

Chromium Release from a COPR‐Contaminated Soil at Varying Water Content and Redox Conditions

Matern

Mansfeldt

2016

J of Env Quality

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Many soils in the region of Kanpur, North India, are heavily affected by the leather industry and its upstream supplier sector, as indicated by elevated chromium (Cr) contents. Under reducing conditions—for instance, at water saturation after monsoon rain or flood irrigation—the dynamic and species distribution of Cr may be affected due to changes in redox potential (EH). In this study, the influence of EH on the speciation and release of Cr from a contaminated agricultural soil was investigated. A soil sample that was affected by hyperalkaline leachate from chromite ore processing residue, was taken and packed in soil columns, and subjected to a saturation–drainage–saturation cycle. After initial water saturation, the EH dropped slowly to minimum values of around ‒100 mV (calculated to pH 7), while EH was controlled by CrO42−/Cr2O3(s), or CrO42−/(Fe,Cr)OOH redox couples. Soil drainage resulted in a quick return to oxidizing conditions; i.e., EH > 300 mV. The Cr species distribution and release showed a clear trend with EH. At the beginning of the experiment, under oxidizing and weakly reducing conditions (EH range from >100 to 300 mV), Cr(VI) was released in particular. However, under moderately reducing conditions (EH range from 100 to –100 mV), Cr was gradually immobilized and irreversible sequestered via reductive precipitation. The results presented in this study provide an improved understanding of the mobility of Cr(VI) in contaminated soils at varying water contents, which is essential for the evaluation of environmental risks in this region. Core Ideas Cr(VI) was highly mobile in the investigated soil. High Cr(VI) concentration prevented the reduction of Mn and Fe. Cr(VI) was mobilized under oxidizing soil conditions. Cr was immobilized under moderately reducing soil conditions.

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Section: Discussionmentioning

confidence: 99%

Chromium Release from a COPR‐Contaminated Soil at Varying Water Content and Redox Conditions

Matern

Mansfeldt

2016

J of Env Quality

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“…The reduction of Fe oxyhydroxides, e.g., in the initial reducing period on the phosphogypsum, is catalysed by microorganisms and does not occur in the subsequent reducing period. Nevertheless, this could be attributed to the time needed for the development of anaerobic microbial activity (Rinklebe and Langer, 2008;Langer and Rinklebe, 2009), which could be longer compared to our short one week anoxic periods (Frohn et al, 2014), or to the acidic conditions that hindered the establishment of the anoxic environment (Phan et al, 2018). These conditions may arise from the nil formation of Fe oxyhydroxides during oxic periods due to the main precipitation of phosphate.…”

Section: Fe and S Redox Processes' Effect On Metal Behaviourmentioning

confidence: 79%

Effects of redox oscillations on the phosphogypsum waste in an estuarine salt-marsh system

et al. 2020

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Salt marshes are natural deposits of heavy metals in estuarine systems, where sulphide precipitation associated with redox changes often results in a natural attenuation of contamination. In the present study, we focus on the effects of variable redox conditions imposed to a highly-polluted phosphogypsum stack that is directly piled over the salt marsh soil in the Tinto River estuary (Huelva, Spain). The behaviour of contaminants is evaluated in the phosphogypsum waste and in the marsh basement, separately, in controlled, experimentally-induced oscillating redox conditions. The results revealed that Fe, and to a lesser extent S, control most precipitation/dissolution processes. Ferric iron precipitates in the form of phosphates and oxyhydroxides, while metal sulphide precipitation is insignificant and appears to be prevented by the abundant formation of Fe phosphates. An antagonistic evolution with changing redox conditions was observed for the remaining contaminants such as Zn, As, Cd and U, which remained mobile in solution during most of experimental run. Therefore, these findings revealed that high concentrations of phosphates inhibit the typical processes of immobilization of pollutants in salt-marshes which highlights the elevated contaminant potential of phosphogypsum wastes on coastal environments.

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“…Despite the recently identified challenge of linking pedology and hydrology [1,2], wetland soils-particularly floodplain soils and their microbial diversity-have not been studied widely in comparison to terrestrial soils [3,4].…”

Section: Introductionmentioning

confidence: 99%

Primary Producers and Anthropic Signs Related to the Flood Plain Soils of the Tablas de Daimiel Wetland

et al. 2018

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Abstract:In the Tablas de Daimiel National Park (TDNP) wetlands, a semi-arid wetland system in Spain that is of international importance, it is believed that pollutants from a variety of sources accumulate. In the study reported here, we evaluated soils from the flooded part of this wetland in an effort to establish relationships between the abundance/structure of microbial communities (mainly cyanobacteria) and certain soil properties (redox potential, dissolved oxygen, organic matter, soil reaction, electrical conductivity, calcium carbonate, total nitrogen, soluble phosphorus and total phosphorus). This objective was achieved by establishing one transect from the entrance to exit of the flood plain, including sampling from potentially polluted sites. Substantial variations between sampling sites were found in soil in terms of salinity, dissolved oxygen (DO), organic matter (OM), total phosphorus (TP) and nitrogen (TN). The presence of primary producers was more evident in contaminated samples. In addition to calcium, high levels of oxidizable organic matter, traces of dissolved oxygen, and considerable amounts of nitrate and phosphates probably stimulated the growth of cyanobacteria, these latter characteristics can be explained as being due to the influence of wastewaters from urban, industrial and agricultural activities that run off directly into this unique wetland. In the future it will be necessary to understand the synergic effects of other soil properties.

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Floodplain soils at the Elbe river, Germany, and their diverse microbial biomass

Cited by 23 publications

References 71 publications

Chromium Release from a COPR‐Contaminated Soil at Varying Water Content and Redox Conditions

Chromium Release from a COPR‐Contaminated Soil at Varying Water Content and Redox Conditions

Effects of redox oscillations on the phosphogypsum waste in an estuarine salt-marsh system

Primary Producers and Anthropic Signs Related to the Flood Plain Soils of the Tablas de Daimiel Wetland

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