硅酸盐对镉污染烟田的原位修复效应研究

The Governance Effect of In-Situ Remediation on Cadmium-Contaminated Using Silicate in Tobacco Field

以硅酸盐矿物为钝化材料,通过田间试验,考察硅酸盐对烟叶镉含量和土壤中镉含量及形态分布的影响用以表征修复效果;研究了硅酸盐对土壤pH和N、P、K含量的影响以表征其对土壤环境质量的影响。结果表明:硅酸盐既能提高土壤pH,使pH值最高达7.98,又能降低土壤中镉的生物有效性,有效抑制烟叶对镉的吸收;另外,还可改善土壤肥力,增加土壤中P和K的含量,最大增幅约为25%。综合而言,硅酸盐是修复镉污染烟田的优选修复材料,施用量以12 000kg·hm^(-2)为宜。

In--situ field scale remediation of Cd polluted tobacco soil using silicate was conducted to investi- gate the remediation effects. The effect of in--situ remediationt on Cd concentration tobacco, content and distribution of Cd in soil, pH values of soil, N, P and K contained in soils were studied. The results showed that the silicate can increase soil pH, the pH value up to 7.98, but reduce the soil bioavailability and cadmium accumulation in tobacco. In addition, it can improve the soil nutrient, increase the content of P and K, the largest increase is 25% approximately. In total,the silicate can be recommended as in-situ remediation agents for cadmium--contaminated in tobacco field. The dosage of silicate is 12 000 kg·hm^2.