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Soil organic matter affects arsenic and antimony sorption in anaerobic soils.
Environmental Pollution ( IF 7.6 ) Pub Date : 2019-11-04 , DOI: 10.1016/j.envpol.2019.113566 Mieke Verbeeck 1 , Yves Thiry 2 , Erik Smolders 1
Environmental Pollution ( IF 7.6 ) Pub Date : 2019-11-04 , DOI: 10.1016/j.envpol.2019.113566 Mieke Verbeeck 1 , Yves Thiry 2 , Erik Smolders 1
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Soil organic matter (SOM) affects arsenic (As) and antimony (Sb) mobility in soils under waterlogged conditions by acting as an electron donor, by catalyzing redox-cycling through electron shuttling and by acting as a competing ligand. This study was set up to disentangle these different effects of SOM towards As and Sb sorption in anaerobic soils. Nine samples were taken at different depths in an agricultural soil profile to collect samples with a natural SOM gradient (<1-40 g soil organic carbon kg-1). The samples were incubated either or not under waterlogged conditions in an anaerobic chamber for 63-70 days, and glucose (5 g C kg-1) was either or not added to the anaerobic incubated samples as an electron donor that neither acts as an electron shuttle nor as a competing ligand. The solid-liquid distribution coefficients (KD) of As and Sb were measured at trace levels. The KD values of As decreased ∼2 orders of magnitude upon waterlogging the SOM rich topsoil, while no additional changes were observed when glucose was added. In contrast, smaller changes in the As KD values were found in the low SOM containing subsoil samples, unless glucose was added that mobilised As. The Sb KD values increased upon reducing conditions up to factor 20, but again only in the high SOM topsoil samples. Surprisingly, the Sb immobilisation during waterlogging only occurred in Sb amended soils whereas the geogenic Sb was mobilised upon reducing conditions, although total dissolved Sb concentrations remained low (<10 nM). The change in As and Sb sorption upon waterlogging was similar in the SOM rich topsoil as in the low SOM subsoil amended with glucose. This suggests that the SOM dependent changes in As and Sb mobility in response to soil waterlogging are primarily determined by the role of SOM as electron donor.
中文翻译：
土壤有机质影响厌氧土壤中砷和锑的吸附。
在淹水条件下，土壤有机质（SOM）通过充当电子给体，通过电子穿梭催化氧化还原循环以及充当竞争性配体来影响土壤中砷（As）和锑（Sb）的迁移。进行这项研究的目的是弄清SOM对厌氧土壤中As和Sb吸附的不同影响。在农业土壤剖面的不同深度采集了9个样品，以自然SOM梯度（<1-40 g土壤有机碳kg-1）收集样品。将样品在浸水条件下在厌氧条件下培养63-70天，或将葡萄糖（5 g C kg-1）添加或不添加到厌氧培养样品中作为既不充当电子又不充当电子的电子供体。穿梭或作为竞争配体。在痕量水平上测定了As和Sb的固液分配系数（KD）。浸透富含SOM的表层土壤后，As的KD值降低了约2个数量级，而添加葡萄糖时未观察到其他变化。相反，在低SOM含量的地下土壤样品中，As KD值的变化较小，除非添加了葡萄糖以使As迁移。在还原条件下，Sb KD值增加到因子20，但仅在高SOM表土样品中才增加。出乎意料的是，在涝渍过程中，Sb的固定化仅发生在Sb改良土壤中，而成矿型Sb在还原条件下被移动化，尽管总溶解Sb浓度仍然很低（<10 nM）。富SOM的表层土壤中淹水后As和Sb吸附的变化与葡萄糖修饰的低SOM底层土壤中的As和Sb吸附变化相似。这表明响应土壤浸水的SOM依赖的As和Sb迁移率变化主要取决于SOM作为电子供体的作用。
更新日期：2019-11-04
中文翻译：
土壤有机质影响厌氧土壤中砷和锑的吸附。
在淹水条件下，土壤有机质（SOM）通过充当电子给体，通过电子穿梭催化氧化还原循环以及充当竞争性配体来影响土壤中砷（As）和锑（Sb）的迁移。进行这项研究的目的是弄清SOM对厌氧土壤中As和Sb吸附的不同影响。在农业土壤剖面的不同深度采集了9个样品，以自然SOM梯度（<1-40 g土壤有机碳kg-1）收集样品。将样品在浸水条件下在厌氧条件下培养63-70天，或将葡萄糖（5 g C kg-1）添加或不添加到厌氧培养样品中作为既不充当电子又不充当电子的电子供体。穿梭或作为竞争配体。在痕量水平上测定了As和Sb的固液分配系数（KD）。浸透富含SOM的表层土壤后，As的KD值降低了约2个数量级，而添加葡萄糖时未观察到其他变化。相反，在低SOM含量的地下土壤样品中，As KD值的变化较小，除非添加了葡萄糖以使As迁移。在还原条件下，Sb KD值增加到因子20，但仅在高SOM表土样品中才增加。出乎意料的是，在涝渍过程中，Sb的固定化仅发生在Sb改良土壤中，而成矿型Sb在还原条件下被移动化，尽管总溶解Sb浓度仍然很低（<10 nM）。富SOM的表层土壤中淹水后As和Sb吸附的变化与葡萄糖修饰的低SOM底层土壤中的As和Sb吸附变化相似。这表明响应土壤浸水的SOM依赖的As和Sb迁移率变化主要取决于SOM作为电子供体的作用。
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