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The toxicity of zinc oxide nanoparticles to Lemna minor (L.) is predominantly caused by dissolved Zn.
Aquat Toxicol. 2016 May; 174:46-53.AT

Abstract

Nano-ZnO particles have been reported to be toxic to many aquatic organisms, although it is debated whether this is caused by nanoparticles per sé, or rather dissolved Zn. This study investigated the role of dissolved Zn in nano-ZnO toxicity to Lemna minor. The technical approach was based on modulating nano-ZnO dissolution by either modifying the pH of the growth medium and/or surface coating of nano-ZnO, and measuring resulting impacts on L. minor growth and physiology. Results show rapid and total dissolution of nano-ZnO in the medium (pH 4.5). Quantitatively similar toxic effects were found when L. minor was exposed to nano-ZnO or the "dissolved Zn equivalent of dissolved nano-ZnO". The conclusion that nano-ZnO toxicity is primarily caused by dissolved Zn was further supported by the observation that phytotoxicity was absent on medium with higher pH-values (>7), where dissolution of nano-ZnO almost ceased. Similarly, the reduced toxicity of coated nano-ZnO, which displays a slower Zn dissolution, is also consistent with a major role for dissolved Zn in nano-ZnO toxicity.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Chen X
School of Biological, Earth and Environmental Sciences, University College Cork, Enterprise Centre, Distillery Field, North Mall, Cork, Ireland. Electronic address: hsiaolynchen@gmail.com.
O'Halloran J
School of Biological, Earth and Environmental Sciences, University College Cork, Enterprise Centre, Distillery Field, North Mall, Cork, Ireland; Environmental Research Institute, University College Cork, Cork, Ireland.
Jansen MA
School of Biological, Earth and Environmental Sciences, University College Cork, Enterprise Centre, Distillery Field, North Mall, Cork, Ireland; Environmental Research Institute, University College Cork, Cork, Ireland.

MeSH

AraceaeNanoparticlesWater Pollutants, ChemicalZincZinc Oxide

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26918949

Citation

Chen, Xiaolin, et al. "The Toxicity of Zinc Oxide Nanoparticles to Lemna Minor (L.) Is Predominantly Caused By Dissolved Zn." Aquatic Toxicology (Amsterdam, Netherlands), vol. 174, 2016, pp. 46-53.
Chen X, O'Halloran J, Jansen MA. The toxicity of zinc oxide nanoparticles to Lemna minor (L.) is predominantly caused by dissolved Zn. Aquat Toxicol. 2016;174:46-53.
Chen, X., O'Halloran, J., & Jansen, M. A. (2016). The toxicity of zinc oxide nanoparticles to Lemna minor (L.) is predominantly caused by dissolved Zn. Aquatic Toxicology (Amsterdam, Netherlands), 174, 46-53. https://doi.org/10.1016/j.aquatox.2016.02.012
Chen X, O'Halloran J, Jansen MA. The Toxicity of Zinc Oxide Nanoparticles to Lemna Minor (L.) Is Predominantly Caused By Dissolved Zn. Aquat Toxicol. 2016;174:46-53. PubMed PMID: 26918949.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The toxicity of zinc oxide nanoparticles to Lemna minor (L.) is predominantly caused by dissolved Zn. AU - Chen,Xiaolin, AU - O'Halloran,John, AU - Jansen,Marcel A K, Y1 - 2016/02/20/ PY - 2015/11/24/received PY - 2016/02/16/revised PY - 2016/02/17/accepted PY - 2016/2/27/entrez PY - 2016/2/27/pubmed PY - 2016/9/9/medline KW - Coating KW - Dissolved Zn KW - Lemna minor KW - Nano-ZnO KW - Toxicity KW - pH SP - 46 EP - 53 JF - Aquatic toxicology (Amsterdam, Netherlands) JO - Aquat Toxicol VL - 174 N2 - Nano-ZnO particles have been reported to be toxic to many aquatic organisms, although it is debated whether this is caused by nanoparticles per sé, or rather dissolved Zn. This study investigated the role of dissolved Zn in nano-ZnO toxicity to Lemna minor. The technical approach was based on modulating nano-ZnO dissolution by either modifying the pH of the growth medium and/or surface coating of nano-ZnO, and measuring resulting impacts on L. minor growth and physiology. Results show rapid and total dissolution of nano-ZnO in the medium (pH 4.5). Quantitatively similar toxic effects were found when L. minor was exposed to nano-ZnO or the "dissolved Zn equivalent of dissolved nano-ZnO". The conclusion that nano-ZnO toxicity is primarily caused by dissolved Zn was further supported by the observation that phytotoxicity was absent on medium with higher pH-values (>7), where dissolution of nano-ZnO almost ceased. Similarly, the reduced toxicity of coated nano-ZnO, which displays a slower Zn dissolution, is also consistent with a major role for dissolved Zn in nano-ZnO toxicity. SN - 1879-1514 UR - https://www.unboundmedicine.com/medline/citation/26918949/The_toxicity_of_zinc_oxide_nanoparticles_to_Lemna_minor__L___is_predominantly_caused_by_dissolved_Zn_ DB - PRIME DP - Unbound Medicine ER -