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Removal of Cr(VI) by Nanoscale Zero-valent Iron (nZVI) From Soil Contaminated with Tannery Wastes

Abstract

The illegal disposal of tannery wastes at Rania, Kanpur has resulted in accumulation of hexavalent chromium [Cr(VI)], a toxic heavy metal in soil posing risk to human health and environment. 27 soil samples were collected at various depths from Rania for the assessment of Cr(VI) level in soil. Out of 27 samples, five samples had shown significant level of Cr(VI) with an average concentration of 15.84 mg Kg−1. Varied doses of nanoscale zero-valent iron (nZVI) were applied on Cr(VI) containing soil samples for remediation of Cr(VI). Results showed that 0.10 g L−1 nZVI completely reduces Cr(VI) within 120 min following pseudo first order kinetics. Further, to test the efficacy of nZVI in field, soil windrow experiments were performed at the contaminated site. nZVI showed significant Cr(VI) reduction at field also, indicating it an effective tool for managing sites contaminated with Cr(VI).

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Acknowledgments

The authors are deeply indebted to the Director, Indian Institute of Toxicology Research, Lucknow, India, for providing all necessary facilities for this work. Thanks are also due to Uttar Pradesh Council of Science and technology (UPCST) and University Grant Commission (UGC) for providing financial grants.

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Correspondence to Virendra Misra.

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Singh, R., Misra, V. & Singh, R.P. Removal of Cr(VI) by Nanoscale Zero-valent Iron (nZVI) From Soil Contaminated with Tannery Wastes. Bull Environ Contam Toxicol 88, 210–214 (2012). https://doi.org/10.1007/s00128-011-0425-6

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Keywords

  • Nanoscale zero-valent iron
  • Hexavalent chromium
  • Tannery waste
  • Windrows