Nanomaterials in biosolids inhibit nodulation, shift microbial community composition, and result in increased metal uptake relative to bulk/dissolved metals

A - Papers appearing in refereed journals

Judy, J. D., Mcnear, D. H. Jr., Chen, C., Lewis, R. W., Tsyusko, O. V., Bertsch, P. M., Rao, W., Stegemeier, J., Lowry, G. V., McGrath, S. P., Durenkamp, M. and Unrine, J. M. 2015. Nanomaterials in biosolids inhibit nodulation, shift microbial community composition, and result in increased metal uptake relative to bulk/dissolved metals. Environmental Science & Technology. 49 (14), pp. 8751-8758.

AuthorsJudy, J. D., Mcnear, D. H. Jr., Chen, C., Lewis, R. W., Tsyusko, O. V., Bertsch, P. M., Rao, W., Stegemeier, J., Lowry, G. V., McGrath, S. P., Durenkamp, M. and Unrine, J. M.
Abstract

We examined the effects of amending soil with biosolids produced from a pilot-scale wastewater treatment plant containing a mixture of metal-based engineered nanomaterials (ENMs) on the growth of Medicago truncatula, its symbiosis with Sinorhizobium meliloti, and on soil microbial community structure. Treatments consisted of soils amended with biosolids generated with (1) Ag, ZnO, and TiO2 ENMs introduced into the influent wastewater (ENM biosolids), (2) AgNO3, Zn(SO4)2, and micron-sized TiO2 (dissolved/bulk metal biosolids) introduced into the influent wastewater stream, or (3) no metal added to influent wastewater (control). Soils were amended with biosolids to simulate 20 years of metal loading, which resulted in nominal metal concentrations of 1450, 100, and 2400 mg kg–1 of Zn, Ag, and Ti, respectively, in the dissolved/bulk and ENM treatments. Tissue Zn concentrations were significantly higher in the plants grown in the ENM treatment (182 mg kg–1) compared to those from the bulk treatment (103 mg kg–1). Large reductions in nodulation frequency, plant growth, and significant shifts in soil microbial community composition were found for the ENM treatment compared to the bulk/dissolved metal treatment. These results suggest differences in metal bioavailability and toxicity between ENMs and bulk/dissolved metals at concentrations relevant to regulatory limits.

Year of Publication2015
JournalEnvironmental Science & Technology
Journal citation49 (14), pp. 8751-8758
Digital Object Identifier (DOI)doi:10.1021/acs.est.5b01208
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
Transatlantic initiative for nanotechnology and the environment (TINE)
Output statusPublished
Publication dates
Online10 Jun 2015
Publication process dates
Accepted10 Jun 2015
Copyright licensePublisher copyright
PublisherAmerican Chemical Society (ACS)
ISSN0013-936X

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