Remediation of cadmium-contaminated paddy field using soil washing method 2: Effects of washing on soil and rice

摘要

We developed an on-site soil washing method using FeC13 to treat paddy soils contaminated with Cd. Washing substantially decreased soil levels of acid- soluble and manganese oxide-occluded Cd, while organically bound Cd was changed little. Although soil fertility properties (such as pH, exchangeable base, and available N and P) were affected by the soil washing treatment, the adverse effects were not crucial and could be corrected. Washing had no effect on rice growth and yield, and reduced the average Cd concentration in rice grains by about two-thirds compared to a control plot. These results confirmed the effectiveness of the soil-wash method in remediating Cd-contaminated paddy fields.