马婵华

摘要 添加钝化剂是修复重金属污染土壤的有效方法之一。通过在成都平原的水稻轻度Cd污染农田进行田间试验，选取石灰、生物炭、生物有机肥3种钝化剂，探讨轻度Cd污染农田土壤原位钝化修复技术效果。结果表明，向农田土壤中施加石灰、生物炭、生物有机肥等钝化剂可以在一定程度上降低作物籽粒中Cd含量。单一石灰处理、生物炭配施石灰处理以及生物有机肥配施石灰处理可以使水稻常规修复试验中水稻籽粒中Cd含量降低8.85%～29.62%。由此可見，向农田土壤中施加钝化剂可以在一定程度上降低作物籽粒中Cd含量。

关键词 农田土壤污染;重金属镉污染;钝化剂;吸附;钝化;修复

中图分类号 X53  文献标识码 A  文章编号 0517-6611（2021）02-0046-02

doi：10.3969/j.issn.0517-6611.2021.02.014

开放科学（资源服务）标识码（OSID）：

Passivation and Remediation Effects of Different Passivation Agents on the Adsorption of Lightly CadmiumContaminated Farmland Rice

MA Chanhua

（Sichuan Institute of Nuclear Geology，Chengdu，Sichuan 610052）

Abstract Adding passivation agent is one of the effective methods to repair heavy metal contaminated soil.In this paper， field experiments were carried out on lightly Cd contaminated rice fields in Chengdu Plain， and three passivation agents， including lime， biochar and bioorganic fertilizer， were selected to investigate the technical effects of insitu passivation remediation of soil in lightly Cd contaminated farmland.The results showed that adding passivation agents such as lime， biochar and bioorganic fertilizer to the farmland soil could reduce the content of Cd in grain. Single lime treatment， biochar combined with lime treatment and bioorganic fertilizer combined with lime treatment could reduce the Cd content of rice grains by 8.85%-29.62% respectively in conventional rice restoration experiments.Therefore， it can be concluded that applying passivation agent to farmland soil can reduce Cd content of crops to some extent.

Key words Soil pollution in farmland;Heavy metal cadmium pollution;Passivation agent;Adsorption;Passivation;Remediation

土壤是人类生存发展必不可少的自然资源，是农业生产的物质基础，与人类的生存发展和环境息息相关。随着社会经济的快速发展，土壤污染日益严重。进入到土壤系统的重金属Cd，可以通过食物链最终富集到人体，从而产生危害[1]。人体积累少量的Cd便可能引发严重的症状，长期食用Cd超标的食物会富集在肝脏、肾脏和骨骼中，造成各种不同程度的损伤，危害人类健康[2]。联合国环境规划署将Cd列为12种全球性意义的危险化学物质中的首位。因而采取有效的措施治理农田土壤重金属污染尤其是 Cd 的污染，开展重金属污染土壤修复研究，特别是钝化修复技术研究显得尤为迫切[3]。

成都平原气候温和，土地肥沃，是我国重要的粮食产区，也是全国重要的商品粮、油生产基地。……