钝化剂在土壤镉污染修复中的应用

Application of Passivating Agent in Remediation of Red Soil Cadmium Pollution

通过对某小区试验,研究了三种钝化剂(L、NA、NB)对镉污染土壤的修复效果及对糙米镉(Cd)含量的影响。结果显示:与对照相比,三种钝化剂使土壤pH提升了0.8~1.6个单位,使土壤有效态Cd含量降低38%~63%,使糙米Cd含量降低45%~85%。糙米Cd含量与土壤pH及有效态Cd含量存在显著相关性。综合考虑成本、操作、应用效果等,三种钝化剂的推广宜使用量为1500kg/hm^2。

Based on the experiments in the small areas,the paper studies the remediation effect of the three kinds of amendments(passivating agent)(amendment L,NA,NB)on the cadmium polluted soil and the impact on the Cd contents of brown rice.The results show that in comparison with the control,the three amendments(passivating agent)could increase the soil pH value of 0.8~1.6 units,decrease the available Cd content in soil with 38%~63%,and reduce the Cd content of brown rice by 45%~85%.The Cd content of brown rice has significant correlation with the soil pH value and the available Cd content.Based on the comprehensive considerations of factors such as cost,operation and application effect,the suitable dose of the three amendments is 1500kg/hm2.