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Geoscience ›› 2012, Vol. 26 ›› Issue (5): 926-931.

• Geochemistry • Previous Articles     Next Articles

Comparison Study on Toxicity of Different Nanoscale Zero valent Iron

 WANG  Jing-Jiao,   Chen-Jia-Wei   

  1. School of Earth Sciences and Resources, China University of Geosciences, Beijing100083,China
  • Received:2012-04-25 Revised:2012-08-29 Online:2012-10-19 Published:2012-10-23

Abstract:

 Nanoscale zero valent iron (nZVI) particle is a kind of efficient materials for remediation of many pollutants in the environment; however, the potential toxicity of nano particles might be a risk to small size effects. We investigated the toxicity of nZVI toward gram negative Escherichia coli, using coated nZVI supported nZVI and bare nZVI, which are widely used for in situ remediation.Supported nZVI showed the best dispersion performance while bare nZVI the worst. All the three materials showed toxic to Escherichia coli and supported nZVIs toxicity was obviously mitigated.It indicates that the modified nZVI has a physical barrier hindering direct contact between nZVI and bacteria, which is related to electrosteric repulsion.This research emphasizes that the potential risk assessment of nanomaterials are very important before their use.

Key words: nanoscale zerovalent iron, Escherichia coli, toxicity, dispersion