Abstract
Zinc oxide nanoparticles (ZnO NPs) are used in an array of products and processes, ranging from personal care products to antifouling paints, textiles, food additives, antibacterial agents and environmental remediation processes. Soils are an environment likely to be exposed to manmade nanoparticles due to the practice of applying sewage sludge as a fertiliser or as an organic soil improver. However, understanding on the interactions between soil properties, nanoparticles and the organisms that live within soil is lacking, especially with regards to soil bacterial communities. We studied the effects of nanoparticulate, non-nanoparticulate and ionic zinc (in the form of zinc chloride) on the composition of bacterial communities in soil with a modified pH range (from pHÂ 4.5 to pHÂ 7.2). We observed strong pH-dependent effects on the interaction between bacterial communities and all forms of zinc, with the largest changes in bacterial community composition occurring in soils with low and medium pH levels (pHÂ 4.8 and 5.9). The high pH soil (pHÂ 7.2) was less susceptible to the effects of zinc exposure. At the highest doses of zinc (2500Â mg/kg dw soil), both nano and non-nano particulate zinc applications elicited a similar response in the soil bacterial community, and this differed significantly to the ionic zinc salt treatment. The results highlight the importance of considering soil pH in nanotoxicology studies, although further work is needed to determine the exact mechanisms controlling the toxicity and fate and interactions of nanoparticles with soil microbial communities.
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Acknowledgements
The NanoFATE Project CP-FP 247739 (2010–2014) under the 7th Framework Programme of the European Commission (FP7-NMP-ENV-2009, Theme 4) coordinated by C. Svendsen; www.nanofate.eu and DEFRA project CB0460 are acknowledged for financial support. Dr. M. Diez-Ortiz was supported by a Marie Curie Intra-European Fellowship within the 7th European Community Framework Programme (call reference FP7-PEOPLE-2010-IEF, 273207 Nano-Ecotoxicity).
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Daniel. S. Read and Marianne Matzke are joint first authors.
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Read, D.S., Matzke, M., Gweon, H.S. et al. Soil pH effects on the interactions between dissolved zinc, non-nano- and nano-ZnO with soil bacterial communities. Environ Sci Pollut Res 23, 4120–4128 (2016). https://doi.org/10.1007/s11356-015-4538-z
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DOI: https://doi.org/10.1007/s11356-015-4538-z