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In-Situ Immobilization of Cd-Contaminated Soils Using Ferronickel Slag as Potential Soil Amendment

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Abstract

The current study investigated the efficiency and mechanisms of in situ immobilization of artificially Cd-contaminated soils with ferronickel slag (FNS). The available Cd content of soil was measured and the modified European Community Bureau of Reference (BCR) sequential extraction procedure (SEP) was adopted to quantify the evolutions of Cd chemical speciation after the immobilization by the FNS. The results showed that the addition of FNS (5%‒15%) remarkably reduced the available Cd content and increased the pH and cation exchange capacity of soils. The passivation rate of Cd increased from 58.13% to 73.25% as the spiked Cd content rose from 10 to 120 mg kg‒1. The BCR SEP test revealed that the FNS addition substantially reduced the acid soluble fraction and increased the residual fraction of Cd, indicating the reduction of mobility and bioavailability of Cd in soils. The chemical precipitation, ion exchange and surface complexation might be involved in in situ immobilization of Cd-contaminated soils by the FNS.

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Acknowledgements

This work was financially supported by the National Key Research & Development Program of China (2018YFC1900604) and National Natural Science Foundation of China (51674017). The authors gratefully appreciated the Guangxi Jinyuan Nickel Industry Co., Ltd., China for providing ferronickel slag samples.

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Correspondence to Pingfeng Fu.

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Fu, P., Yang, H., Zhang, G. et al. In-Situ Immobilization of Cd-Contaminated Soils Using Ferronickel Slag as Potential Soil Amendment. Bull Environ Contam Toxicol 103, 756–762 (2019). https://doi.org/10.1007/s00128-019-02719-6

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  • DOI: https://doi.org/10.1007/s00128-019-02719-6

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