Universität zu Köln

Hindersmann, Iris and Mansfeldt, Tim (2014). Trace Element Solubility in a Multimetal-Contaminated Soil as Affected by Redox Conditions. Water Air Soil Pollut., 225 (10). DORDRECHT: SPRINGER. ISSN 1573-2932

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Abstract

Redox conditions play an outstanding role in controlling the behaviour of trace elements in soil environments. They are not only sensitive to water saturation but also to soil temperature because many redox reactions are mediated by microorganisms. In this study, we investigated the influence of oxidising (oxygen predominant), weakly reducing (Mn-III,Mn-IV reduction) and moderately reducing (Fe-III reduction) conditions at three temperature regimes (7, 15 and 25 degrees C) on the solubility of ten trace elements. Multimetal-contaminated topsoil (pH 5.8) from a floodplain in Germany was investigated with the following aqua regia-soluble concentrations: Zn 903, Cu 551, Cr 488, Pb 354, Ni 93.5, As 35.7, Co 22.4, Sb 20.5, Cd 8.3 and Mo 6.5 mg kg(-1). Soil suspensions were held at fixed redox potential in microcosm experiments, sampled at every third day and analysed for trace elements. Time to achieve weakly and particularly moderately reducing conditions was temperature dependent and increased in the order 25 degrees C<15 degrees C<7 degrees C. Under oxidising conditions, the solubility of the trace elements was low. Reductive dissolution of Mn oxides under weakly reducing conditions was accompanied by a release of Co and Mo. Reductive dissolution of Fe oxides (and of remaining Mn oxides) under moderately reducing conditions additionally led to a release of As, Cd, Cr, Ni and Pb, whereas Cu and Zn were hardly affected. Antimony revealed a different behaviour because, after a first increase, a continuous decrease in its concentration was observed soon after the onset of weakly reducing conditions. We conclude that soil temperature should be considered as a master variable, to distinguish between weakly and moderately reducing soil conditions, and that it is necessary to keep element-specific behaviour in mind when dealing with the effects of redox conditions in soils on trace element solubility.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hindersmann, Iris UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansfeldt, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-427542
DOI:	10.1007/s11270-014-2158-8
Journal or Publication Title:	Water Air Soil Pollut.
Volume:	225
Number:	10
Date:	2014
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-2932
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ORGANIC-MATTER; HEAVY-METALS; ARSENIC DISTRIBUTION; REDUCING CONDITIONS; MANGANESE-DIOXIDE; FLOODPLAIN SOILS; VINEYARD SOILS; NATURAL-WATERS; FLOODED SOIL; IRON-OXIDES Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42754