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Study of the potential of barnyard grass for the remediation of Cd- and Pb-contaminated soil

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Abstract

In this study, the microwave digestion method was used to determine total cadmium (Cd) and lead (Pb) concentrations, the BCR method was used to determine different states of Cd and Pb, and atomic absorption spectroscopy (AAS) and inductively coupled plasma optical emission spectrometry (ICP-OES) were used to determine Cd and Pb concentrations in simulated soil and barnyard grass before and after planting barnyard grass to provide a theoretical basis for the remediation of Cd- and Pb-contaminated soil. The results showed that the bioconcentration factor changes with different Cd concentrations are relatively complex and that the removal rate increases regularly. The 100 mg kg−1 Cd treatment had the highest removal rate, which reached 36.66%. For Pb, the bioconcentration factor decreased and tended to reach equilibrium as the Pb concentration increased. The highest removal rate was 41.72% and occurred in the 500 mg kg−1 Pb treatment; however, this removal rate was generally lower than that of Cd. In addition, the reduction state had the highest change rate, followed by the residual, acid soluble and oxidation states. For Pb, the residual state has the highest change rate, followed by the acid soluble state, reduction state and oxidation state. In addition, a significant correlation was observed between the soil Pb and Cd concentrations and the concentrations of Pb and Cd that accumulated in the belowground biomass of the barnyard grass, but no significant correlation was observed between the soil Pb and Cd concentrations and the amounts of Pb and Cd that accumulated in the aboveground biomass of the barnyard grass. The highest transfer factor of Cd was 0.49, which occurred in the 5 mg kg−1 Cd treatment. The higher transfer factor of Pb was 0.48 in the 100 mg kg−1 Pb treatment. All of these factors indicate that the belowground biomass of barnyard grass plays a more important role in the remediation of Cd- and Pb-contaminated soils than the aboveground biomass of barnyard grass. Remediation should occur through phytostabilization. Thus, with its strong adaptability and lush growth, barnyard grass can be applied as a pioneer species for the phytoremediation of Cd- and Pb-contaminated soils.

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Acknowledgments

This project was supported by the Key Scientific Research Programs of the Jilin Province (No. 20140204041SF) and the Department of Environmental Protection Project of the Jilin Province (No. 201501).

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Authors and Affiliations

  1. .State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration / School of Environment, Northeast Normal University, Changchun, Jilin Province, 130117, China

    Jianling Xu, Qiongyao Cai, Hanxi Wang, Jing Lv, Difu Yao, Yue Lu, Wei Li & Yuanyuan Liu

  2. Jilin Provincial Institute of Education, Changchun, 130022, China

    Xuejun Liu

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  1. Jianling Xu
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  2. Qiongyao Cai
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  3. Hanxi Wang
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  4. Xuejun Liu
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  5. Jing Lv
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  6. Difu Yao
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  7. Yue Lu
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  8. Wei Li
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  9. Yuanyuan Liu
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Correspondence to Jianling Xu, Hanxi Wang or Xuejun Liu.

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Xu, J., Cai, Q., Wang, H. et al. Study of the potential of barnyard grass for the remediation of Cd- and Pb-contaminated soil. Environ Monit Assess 189, 224 (2017). https://doi.org/10.1007/s10661-017-5923-5

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