Trace Element Solubility in a Multimetal-Contaminated Soil as Affected by Redox Conditions
Trace Element Solubility in a Multimetal-Contaminated Soil as Affected by Redox Conditions
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DOI：
10.1007/s11270-014-2158-8
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发表时间：
2014-10-01
影响因子：
2.9
通讯作者：
Mansfeldt, Tim
中科院分区：
文献类型：
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作者：
Hindersmann, Iris;Mansfeldt, Tim
氧化还原条件在控制土壤环境中痕量元素的行为方面起着重要作用。它们不仅对水分饱和度敏感，而且对土壤温度也很敏感，因为许多氧化还原反应是由微生物介导的。在本研究中，我们研究了氧化(氧为主)、弱还原(Mn-III、Mn-IV还原)和适度还原(Fe-III还原)三种温度条件(7、15和25℃)对10种微量元素溶解度的影响。对德国河滩表层土壤多金属污染(pH 5.8)进行了调查，其王水可溶浓度为：锌903、铜551、铬488、铅354、镍93.5、砷35.7、钴22.4、锑20.5、镉8.3和钼6.5 mg kg(-1)。在微观世界实验中，土壤悬浮液被保持在固定的氧化还原电位下，每隔三天采样一次，并进行微量元素分析。达到微弱和特别适度还原条件的时间取决于温度，并以25摄氏度的数量级增加
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