Environmental Chemistry

ISSN 0254-6108

CN 11-1844/X

Vol. 38 No. 5
May  2019
Article Contents

Citation:

Stabilization of Cd-contaminated agricultural soils by modified nano-silica

  • Received Date: 2018-06-18
    Fund Project:

    Supported by the National Natural Science Foundation of China (51704093, 41430637), First-Class Disciplines Innovation Team Training Projects in Henan University (2018YLTD16), Science and Technology Development Project of Henan Province (182102311007) and Science and Technology Development Project of Kaifeng City (1802007).

  • Cd-contaminated soil has seriously threatened the health of human and safety of ecological environment. Stabilization is an important method in remediating Cd-contaminated soil due to its high efficiency, rapidity and low cost. In this study, modified nano-silica (GSN) was used as a stabilization agent to remediate Cd-contaminated agricultural soil under both laboratory and field conditions. The influence of GSN addition on DTPA-extractable Cd content, distribution of Cd fraction and Cd content in wheat grain were analyzed. Under laboratory conditions, GSN addition reduced the content of DTPA-extractable Cd in the soil and the highest stabilization efficiency reached to 91.77%. The exchangeable and carbonate bounded fractions Cd content in soil decreased by 69.26% and 48.29% respectively when the dosage of GSN is 1%, while the content of residual Cd in soil increased by 143.14%. In addition, the addition of different dosages of GSN had insignificant effect on the soil enzyme activities. In the field experiment, the addition of GSN had insignificant effect on wheat yields, and the content of Cd in wheat grain decreased from 0.342 mg·kg-1 to 0.178 mg·kg-1. These results indicate that GSN has great potential in stabilizing Cd contaminated agricultural soils.
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Stabilization of Cd-contaminated agricultural soils by modified nano-silica

  • 1. Henan University Yellow River Civilization and Sustainable Development Research Center and Yellow River Civilization Inheritance and Modern Civilization Construction Henan Collaborative Innovation Center, Kaifeng, 475001, China;
  • 2. Henan University Institute of Agricultural and Rural Sustainable Development, Kaifeng, 475001, China;
  • 3. Henan Province Key Laboratory Monitoring and Remediation of Soil Heavy Metals, Jiyuan, 459000, China
Fund Project:  Supported by the National Natural Science Foundation of China (51704093, 41430637), First-Class Disciplines Innovation Team Training Projects in Henan University (2018YLTD16), Science and Technology Development Project of Henan Province (182102311007) and Science and Technology Development Project of Kaifeng City (1802007).

Abstract: Cd-contaminated soil has seriously threatened the health of human and safety of ecological environment. Stabilization is an important method in remediating Cd-contaminated soil due to its high efficiency, rapidity and low cost. In this study, modified nano-silica (GSN) was used as a stabilization agent to remediate Cd-contaminated agricultural soil under both laboratory and field conditions. The influence of GSN addition on DTPA-extractable Cd content, distribution of Cd fraction and Cd content in wheat grain were analyzed. Under laboratory conditions, GSN addition reduced the content of DTPA-extractable Cd in the soil and the highest stabilization efficiency reached to 91.77%. The exchangeable and carbonate bounded fractions Cd content in soil decreased by 69.26% and 48.29% respectively when the dosage of GSN is 1%, while the content of residual Cd in soil increased by 143.14%. In addition, the addition of different dosages of GSN had insignificant effect on the soil enzyme activities. In the field experiment, the addition of GSN had insignificant effect on wheat yields, and the content of Cd in wheat grain decreased from 0.342 mg·kg-1 to 0.178 mg·kg-1. These results indicate that GSN has great potential in stabilizing Cd contaminated agricultural soils.

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