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Comparison of Several Amendments for In-Site Remediating Chromium-Contaminated Farmland Soil

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Abstract

Hexavalent chromium (Cr(VI)), which has been classified as a Group A human carcinogens list by the United States Environmental Protection Agency, possesses stronger biological toxicity, and its discharge into farmland has become a pressing environmental problems. To screen the cost-efficient Cr(VI)-contaminated soil in situ amended materials, the effects of ordinary zero-valent iron (ZVI), nanoscale zero-valent iron (nZVI), biochar (B), biochar/zero-valent iron (BZVI), and biochar/nanoscale zero-valent iron (BnZVI) on the immobilization of Cr(VI) in spiked soil (Cr(VI) = 325 mg kg−1, Crtotal = 640 mg kg−1) were compared in this paper. After 15 days remediation by those materials, toxicity characteristic leaching procedure and physiological-based extraction test showed that the Cr(VI) leachability and bioaccessibility were reduced by 14–92% and 4.3–92% respectively, and the order of immobilization was found to be nZVI > BnZVI > BZVI > ZVI > B. Moreover, sequential extraction procedure indicated that all materials can increase the proportion of the residual Cr, and nZVI had the most significant effect. Plant seedling growth test proved that the nanoscale zero-valent iron was able to reduce the toxicity of chromium in plants greatly in a short time, while BnZVI treatment is more favorable to the growth of plants. To sum up, the nano zero-valent iron and biochar combined treatment not only removed Cr(VI) and immobilized total chromium efficiently but also enabled plant growth in relative high chromium-containing soil.

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Acknowledgements

This research was supported by the Guangzhou External Science and Technology Cooperation Project (2016201604030002) and the Science and Technology Program of Guangdong, China (2016A020221029).

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Authors and Affiliations

  1. School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong, 510006, China

    Nuanqin Zhang, Zhanqiang Fang & Runyuan Zhang

  2. Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou, Guangdong, 510006, China

    Nuanqin Zhang, Zhanqiang Fang & Runyuan Zhang

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  1. Nuanqin Zhang
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  2. Zhanqiang Fang
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Correspondence to Zhanqiang Fang.

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Zhang, N., Fang, Z. & Zhang, R. Comparison of Several Amendments for In-Site Remediating Chromium-Contaminated Farmland Soil. Water Air Soil Pollut 228, 400 (2017). https://doi.org/10.1007/s11270-017-3571-6

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