alexa Phytotoxicity of Metal Oxide Nanoparticles is Related to Both Dissolved Metals Ions and Adsorption of Particles on Seed Surfaces
ISSN:2157-7463

Journal of Petroleum & Environmental Biotechnology
Open Access

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Research Article

Phytotoxicity of Metal Oxide Nanoparticles is Related to Both Dissolved Metals Ions and Adsorption of Particles on Seed Surfaces

Stephen G. Wu1, Li Huang1, Jennifer Head1, Da-Ren Chen1, In-Chul Kong2* and Yinjie J. Tang1*
1Department of Energy, Environmental and Chemical Engineering, Washington University, St. Louis, Missouri 63130, USA
2Department of Environmental Engineering, Yeungnam University, Kyungsan City, Kyungbuk 712-749, Republic of Korea
Corresponding Authors : Yinjie J Tang
Assistant Professor, Department of Energy
Environmental and Chemical Engineering
Washington University, St. Louis, Missouri 63130, USA
Tel: 1-314-935-3441
Fax: 1-314-935-5464
E-mail: [email protected]
  In-chul Kong
Professor, Department of Environmental Engineering
Yeungnam University, Kyungsan City
Kyungbuk 712-749, Republic of Korea
Tel: 82-53-810- 2546
Fax: 82-53-810-4624
E-mail: [email protected]
Received May 26, 2012; Accepted July 17, 2012; Published July 20, 2012
Citation: Wu SG, Huang L, Head J, Chen DR, Kong IC, et al. (2012) Phytotoxicity of Metal Oxide Nanoparticles is Related to Both Dissolved Metals Ions and Adsorption of Particles on Seed Surfaces. J Pet Environ Biotechnol 3:126. doi:10.4172/2157-7463.1000126
Copyright: © 2012 Tang YJ, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

This study assesses the biological effects of nanoparticles (NPs) based on seed germination and root elongation tests. Lettuce, radish and cucumber seeds were incubated with various metal oxide NPs (CuO, NiO, TiO2, Fe2O3, Co3O4), of which only CuO and NiO showed deleterious impacts on the activities of all three seeds. The measured EC50 for seed germinations were: lettuce seed (NiO: 28 mg/L; CuO: 13 mg/L), radish seed (NiO: 401 mg/L; CuO: 398 mg/L), and cucumber seed (NiO: 175 mg/L; CuO: 228 mg/L). Phytotoxicity of TiO2, Fe2O3 and Co3O4 to the tested seeds was not significant, while Co3O4 NP solution (5 g/L) was shown to improve root elongation of radish seedling. Metal oxide NPs tended to adsorb on seed surfaces in the aqueous medium and released metal ions near the seeds. Therefore, metal oxide NPs had higher phytotoxicity than free metal ions of the equivalent concentrations. Further, the surface area-to-volume ratio of seeds may also affect NPs phytotoxicity, whereby small seeds (i.e., lettuce) were the most sensitive to CuO and NiO NPs in our experiments.

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