氧化还原电位交替变化-淋洗去除滩涂中重金属

Alternation of Oxidation Reduction Potential-Removed Heavy Metals from Reclaimed Farmland by Leaching

利用水槽模拟户外农田实验,通过调控土壤淹水时间来控制土壤的氧化还原电位。研究土壤氧化还原电位的变化,然后通过淋洗对去除土壤中Cd、Cr、Pb、Cu、Zn等重金属的影响。实验设有2个处理,每个处理有2个阶段,所要达到的目标氧还原电位是处理1:-50 mV、-100 mV,处理2:-100 mV、-200 mV。结果表明,在不同的氧化还原电位下,经过淋洗土壤中的重金属的去除率不一样,以Cd、Cr的去除效果最佳,处理1淋洗去除率达到34.94%、19.56%;处理2达到56.49%、39.17%,整体上处理2的去除效果比处理1好,说明随着土壤氧化还原电位的降低,淋洗去除土壤重金属效果呈递增趋势。

In order to study the changes of soil redox potential, the flume to simulation outdoor farmland experiment was done. First, to control the redox potential of the soil through regulating the time of soaking soil, then to remove heavy metals such as Cd, Cr, Pb, Cu, Zn through leaching soil. The experiment consists primarily of two treatments, with each consisting of two phases. The assignment of the first treatment is to keep soil redox potential as -50 mV and -100 mV while that of the second as -100 mV and -200 mV. Results showed that after leaching soil, the removal rate of Cd, Cr worked best, with re-moval rate of heavy metals of the first treatment as 34.94%, 19.56% while that of another as 56.49%, 39.17%. It was found that with the soil redox potential decreased, removal rate of heavy metals was increased.