NDLI: Characterizing the uptake, accumulation and toxicity of silver sulfide nanoparticles in plants

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Environmental Science: Nano Vol - 4 Issue - 1

Environmental Science: Nano Vol -3

Environmental Science: Nano Vol -2

Environmental Science: Nano Vol -1

Characterizing the uptake, accumulation and toxicity of silver sulfide nanoparticles in plants

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Peng Scheckel, Kirk G. Zhao, Fang-Jie Kopittke, Peter M. Sun, Shengkai Lombi, Enzo Malysheva, Anzhela McKenna, Brigid A. Menzies, Neal W.
Copyright Year	2017
Abstract	Silver nanoparticles (Ag-NPs) are used in a wide range of everyday products, leading to increasing concerns regarding their accumulation in soils and subsequent impact on plants. Using single particle inductively coupled plasma mass spectrometry (spICP-MS) and synchrotron-based techniques including X-ray absorption spectroscopy (XAS) and X-ray fluorescence microscopy (XFM), we characterized the uptake, speciation, and translocation of insoluble Ag2S-NPs (an environmentally-relevant form of Ag-NPs in soils) within two plant species, a monocot and a dicot. Exposure to 10 mg Ag L−1 as Ag2S-NPs for one week resulted in a substantial increase in leaf Ag concentrations (3.8 to 5.8 μg Ag g−1 dry mass). Examination using XAS revealed that most of the Ag was present as Ag2S (>91%). Furthermore, analyses using spICP-MS confirmed that these Ag2S particles within the leaves had a markedly similar size distribution to those supplied within the hydroponic solution. These observations, for the first time, provide direct evidence that plants take up Ag2S-NPs without a marked selectivity in regard to particle size and without substantial transformation (dissolution or aggregation) during translocation from roots to shoots. Furthermore, after uptake, these Ag2S-NPs reduced growth, partially due to the solubilisation of Ag+in planta, which resulted in an upregulation of genes involved in the ethylene signalling pathway. Additionally, the upregulation of the plant defense system as a result of Ag2S-NPs exposure may have contributed to the decrease in plant growth. These results highlight the risks associated with Ag-NP accumulation in plants and subsequent trophic transfer via the food chain.
Starting Page	448
Ending Page	460
Page Count	13
File Format	HTM / HTML PDF
ISSN	20518153
Volume Number	4
Issue Number	2
Journal	Environmental Science: Nano
DOI	10.1039/c6en00489j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Inductively coupled plasma mass spectrometry X-ray absorption spectroscopy Absorption spectroscopy X-ray fluorescence Fluorescence microscope XFM Manchester Speciation Monocotyledon Dicotyledon Silver sulfide Hydroponics Ethylene
Content Type	Text
Resource Type	Article
Subject	Environmental Science Materials Science

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