土壤无机离子在非均匀电场作用下的迁移

The mobilization of inorganic ions in soil by the action of non-uniform electric field.

研究了非均匀电场对不饱和沙壤土中的NO3-和SO42-的迁移特征,揭示利用非均匀电场向土壤中注入营养物和电子受体的特性.结果表明,非均匀电场能有效地增强土壤中NO3-和SO42-的移动性,在1.0V/cm电压梯度下不饱和沙壤土中NO3-和SO42-的电迁移速率分别高达22.0,16.5cm/d;在非均匀电场中无机离子主要通过场强较大的区域迁移;切换电场极性可以方便地控制土壤中NO3-和SO42-的运移,同时能促使NO3-转化为NO2-.利用非均匀电场的迁移和富集效应,可以有效地向土壤中注入无机离子或者将污染离子从土壤中分离出来.

The mobilization characteristics of NO3- and SO42- in unsaturated sandy loam under non-uniform electric field were studied to reveal the potential application of non-uniform electric field in injecting nutrients and electron acceptor into the soil. Non-uniform electric field could enhance effectively the mobility of NO3- and SO42- in soil, and the migration rates of NO3- and SO42- in unsaturated sandy loam were high up to 22.0 and 16.5cm/d, respectively, under an electric gradient of 1.0V/cm. In non-uniform electric field, the inorganic ions were mobilized mainly through the region with higher electric field strength; reversing the polarity of the electric field could control easily the movement of NO3- and SO42- in soil, and meanwhile promote transformation of NO3- into NO2-. The migration and concentration effects generated by non-uniform electric field could be used effectively inorganic ions into soil, or to extract ions from polluted soils.