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利用土柱淋溶实验研究Cr(VI)和As(V)在不同类型土壤中的垂向迁移特征。结果表明,Cr(VI)和As(V)在含砂砾和砾石的河流冲积物中迁移速度最大,而在粘粒含量较高的黄土中迁移速度最小。土壤砂粒含量和pH值越高,Cr(VI)和As(V)的迁移速度越大。粉粒、粘粒、铁氧化物和锰氧化物含量越高,越不利于Cr(VI)和As(V)的迁移,说明以上因素对于Cr(VI)和As(V)在土壤中的吸附具有很大的贡献。总有机碳(Total Organic Carban,TOC)的含量升高不利于Cr(VI)和As(V)的迁移,但是影响不大。
Soil column leaching experiments were used to study the vertical migration of Cr (VI) and As (V) in different soil types. The results show that Cr (VI) and As (V) migrate most rapidly in river sediments with grit and gravel, and have the least migration velocity in loess with high clay content. The higher the sand content and pH value, the greater the migration speed of Cr (VI) and As (V). The higher the content of silt, clay, iron oxide and manganese oxide, the more unfavorable the migration of Cr (VI) and As (V), indicating the adsorption of Cr (VI) and As (V) Has a great contribution. The increase of Total Organic Carban (TOC) was not conducive to the migration of Cr (VI) and As (V), but had little effect.