Tokyo University of Agriculture, Faculty of Bioindustry, Laboratory of Integrated Crop Management Science, 196 Yasaka, Abashiri, Hokkaido 099-2493, Japan.
Tokyo University of Agriculture, Faculty of Bioindustry, Laboratory of Integrated Crop Management Science, 196 Yasaka, Abashiri, Hokkaido 099-2493, Japan.
Chemosphere. 2014 Sep;111:366-71. doi: 10.1016/j.chemosphere.2014.04.024. Epub 2014 May 14.
Studies on the sorption behaviors of selenium (Se) and antimony (Sb) are reviewed. Both Se and Sb chemical speciation can be controlled by pH and redox potential, and both of them are likely to be sorbed onto oxy-hydroxides of aluminum, iron or manganese in soils. For agricultural soils especially, there are important physico-chemical and biological differences between non-flooded and wetland soils. Se forms Se(VI), Se(IV), Se(0), Se(-II), and organic Se species at soil pH and redox conditions. Under non-flooded conditions Se solubility is governed by an adsorption mechanism onto metal oxy-hydroxides rather than by precipitation and dissolution reactions; however, for the conditions of wetland soils, it can be expected that Se(0) and organic matter-bound Se play an important role. For Sb, in the soil environment, the dominant Sb forms are Sb(III) and Sb(V). Under aerobic soil conditions, Sb(III) is likely to be oxidized to Sb(V), and the dominant sorbed Sb species should be Sb(V). Under reducing conditions Sb mobility should be lower than under oxidizing conditions due to the lower mobility of Sb(III); however, reduction of Fe and Mn oxides could lead to dissolution of Fe and Mn-bound Sb. This indicates that the risk of Sb contamination to the food chain could be increased in wetland systems.
综述了硒（Se）和锑（Sb）的吸附行为研究。pH 值和氧化还原电位可以控制 Se 和 Sb 的化学形态，而且它们都有可能被土壤中的铝、铁或锰的水合氧化物吸附。特别是对于农业土壤，非淹水和湿地土壤之间存在重要的物理化学和生物学差异。在土壤 pH 值和氧化还原条件下，Se 会形成 Se(VI)、Se(IV)、Se(0)、Se(-II)和有机 Se 物种。在非淹水条件下，Se 的溶解度受金属水合氧化物吸附机制控制，而不是沉淀和溶解反应；然而，对于湿地土壤的条件，可以预期 Se(0)和有机物质结合的 Se 发挥重要作用。对于 Sb，在土壤环境中，主要的 Sb 形态是 Sb(III)和 Sb(V)。在有氧土壤条件下，Sb(III)很可能被氧化为 Sb(V)，主要的吸附 Sb 物种应该是 Sb(V)。在还原条件下，Sb 的迁移性应该低于氧化条件，因为 Sb(III)的迁移性较低；然而，Fe 和 Mn 氧化物的还原可能导致 Fe 和 Mn 结合的 Sb 的溶解。这表明 Sb 污染对食物链的风险可能会在湿地系统中增加。
