您好，欢迎访问湖北省农业科学院 机构知识库！
湖北省农业科学院机构知识库

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

Magnetic removal/immobilization of cadmium and zinc in contaminated soils using a magnetic microparticle solid chelator and its effect on rice cultivation

文献类型： 外文期刊

作者： Nie, Xinxing 1 ; Zhang, Zhiyi 2 ; Xia, Xiange 1 ; Yang, Li 1 ; Fan, Xianpeng 2 ; Zheng, Manjie 4 ;

作者机构： 1.Minist Agr & Rural Affairs, Key Lab Fertilizat Agr Wastes, Wuhan 430064, Peoples R China

2.Minist Agr & Rural Affairs, Qianjiang Sci Observing & Expt Stn Agroenvironm &, Qianjiang 433116, Peoples R China

3.Hubei Acad Agr Sci, Inst Plant Protect & Soil Sci, Wuhan 430064, Peoples R China

4.Golden Shield Environm Technol Co Ltd, Wuhan 430064, Peoples R China

关键词： Cadmium; Immobilization; Magnetic separation; Microparticle solid chelator; Rice cultivation; Zinc

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2020 年 20 卷 4 期

页码：

收录情况： SCI

摘要： Purpose Magnetic removal techniques using functionalized magnetic nanoparticles as adsorbents have been frequently tested for use in the removal of heavy metals in aqueous solution, but seldom in farmland soil. Here, a novel magnetic microparticle solid chelator (MSC) was employed as the adsorbent for magnetic removal and/or immobilization of Cd and Zn in a paddy soil (PS), an upland soil (US), and a paddy-upland rotation soil (RS) with different degrees of pollution. Materials and methods MSC was applied to 14 kg air-dried soil samples (PS, US, and RS) at the dosage of 1% (w/w), and then watered, and intermittently stirred. Finally, the MSC-metal complexes were retrieved using a magnetic device (MCR treatment) or not (MC treatment), and the removal efficiency of soil Cd and Zn in MCR treatment was evaluated. After magnetic separation of MSC-metal complexes, pot experiments were performed to investigate the impacts of the magnetic remediation process on rice growth, the phytoavailability of soil Cd and Zn, and the accumulation of Cd and Zn in rice plants. Results and discussion The MCR treatment exhibited recovery rates of 55.4%, 49.6%, and 19.0% for MSC-metal complexes in PS, US, and RS, respectively, which brought about removal efficiencies of 2.2-12.2% for Cd and 1.9-4.6% for Zn. The MC and MCR treatments substantially decreased the availability of soil Cd, but not soil Zn; this effect was more remarkable when using CaCl2 instead of DTPA as the extractant for determination of bioavailable metals. Furthermore, the CaCl2-extractable Cd and Zn had a more significant relationship with Cd and Zn concentrations in rice roots. The MC and MCR treatments led to dramatic reductions in rice grain Cd of 23.9-72.1% and 37.3-63.9%, respectively, in the three soils relative to the respective controls. The MC and MCR treatments also exhibited an inhibitory effects on rice grain Zn accumulation in US (10.6% and 4.3% decreases, respectively) and RS (9.3% and 19.5% decreases, respectively), but not in PS. Moreover, the grain yield was unaffected under the MCR treatment in the three soils, and significantly increased by 29.8% under the MC treatment in US. Conclusions Our study suggests that MSC-based magnetic remediation technique can effectively immobilize and/or remove Cd and Zn in farmland soils, decreasing their uptake by rice plants, with no adverse effects on grain yield.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：湖北省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台