Abstract
Introduction
Acidic and metal(oid)-rich topsoils resulted after 34 years of continuous operations of a copper smelter in the Puchuncaví valley, central Chile. Currently, large-scale remediation actions for simultaneous in situ immobilization of metals and As are needed to reduce environmental risks of polluted soils. Aided phytostabilization is a cost-effective alternative, but adequate local available soil amendments have to be identified and management options have to be defined.
Materials and methods
Efficacy of seashell grit (SG), biosolids (B), natural zeolite (Z), and iron-activated zeolite (AZ), either alone or in mixtures, was evaluated for reducing metal (Cu and Zn) and As solubilization in polluted soils under laboratory conditions. Perennial ryegrass was used to test phytotoxicity of experimental substrates.
Results
Soil neutralization to a pH of 6.5 with SG, with or without incorporation of AZ, significantly reduces metal (Cu and Zn) solubilization without affecting As solubilization in soil pore water; furthermore, it eliminates phytotoxicity and excessive metal(oid) accumulation in aerial plant tissues. Addition of B or Z to SG-amended soil does not further reduce metal solubilization into soil pore water, but increase As solubilization due to excessive soil neutralization (pH > 6.5); however, no significant As increase occurs in aerial plant tissues.
Conclusion
Simultaneous in situ immobilization of metal(oid) in acidic topsoils is possible through aided phytostabilization.



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Acknowledgments
The present study was funded by yhe FONDECYT grant project 1085005. The authors would like to thank Paola Arata of Aguas Andinas S.A., Luis Cerda of Andayem Ltda., and Eduardo Barbieri of Sociedad Contractual Minera Aceituno for providing the amendments.
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Cárcamo, V., Bustamante, E., Trangolao, E. et al. Simultaneous immobilization of metals and arsenic in acidic polluted soils near a copper smelter in central Chile. Environ Sci Pollut Res 19, 1131–1143 (2012). https://doi.org/10.1007/s11356-011-0673-3
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DOI: https://doi.org/10.1007/s11356-011-0673-3


