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Change of the Extractability of Cadmium Added to Different Soils: Aging Effect and Modeling

Author

Listed:
  • Xi Zhang

    (Chinese Academy of Agricultural Engineering, Beijing 100125, China
    Key Laboratory of Technology and Model for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100125, China)

  • Saiqi Zeng

    (National Soil Fertility and Fertilizer Effects Long-Term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Shibao Chen

    (National Soil Fertility and Fertilizer Effects Long-Term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Yibing Ma

    (National Soil Fertility and Fertilizer Effects Long-Term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

Abstract

Ethylenediaminetetraacetic acid (EDTA) is known to be a chelating agent and has been widely used for estimating the total extractable metals in soil. The effect of aging on EDTA-extractable cadmium (Cd) was investigated in five different soils at three Cd concentrations incubated for 180 days. The EDTA-extractable Cd rapidly decreased after incubated during 30–60 days, followed by slow processes, and for 90 days the EDTA-extractable Cd tended to be stable. The decrease in EDTA-extractable Cd may be due to precipitation/nucleation processes, diffusion of Cd into the micropores/mesopores, and occlusion within organic matter in soils. A semi-mechanistic model to predict the extractability of Cd during incubation, based on processes of Cd precipitation/nucleation, diffusion, and occlusion within organic matter, was developed and calibrated. The results showed that the processes of micropore/mesopore diffusion were predominant processes affecting the extractability of Cd added to soils, and were slow. However, the proportions of the processes of precipitation/nucleation and occlusion within organic matter to the non-EDTA-extractable Cd added to soils were only 0.03–21.0% and 0.41–6.95%, respectively. The measured EDTA-extractable Cd from incubated soils were in good agreement with those predicted by the semi-mechanistic model ( R 2 = 0.829). The results also indicated that soil pH, organic matter, and incubation time were the most important factors affecting Cd aging.

Suggested Citation

  • Xi Zhang & Saiqi Zeng & Shibao Chen & Yibing Ma, 2018. "Change of the Extractability of Cadmium Added to Different Soils: Aging Effect and Modeling," Sustainability, MDPI, vol. 10(3), pages 1-14, March.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:3:p:885-:d:137141
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    Cited by:

    1. Mateusz Sydow & Łukasz Chrzanowski & Alexandra Leclerc & Alexis Laurent & Mikołaj Owsianiak, 2018. "Terrestrial Ecotoxic Impacts Stemming from Emissions of Cd, Cu, Ni, Pb and Zn from Manure: A Spatially Differentiated Assessment in Europe," Sustainability, MDPI, vol. 10(11), pages 1-19, November.
    2. Ahmed Gad & Bandar A. Al-Mur & Waleed A. Alsiary & Sahar M. Abd El Bakey, 2022. "Optimization of Carboniferous Egyptian Kaolin Treatment for Pharmaceutical Applications," Sustainability, MDPI, vol. 14(4), pages 1-16, February.

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