期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 49, 期 14, 页码 8751-8758出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b01208
关键词
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资金
- U.S. Environmental Protection Agency [RD834574]
- U.K. Natural Environment Research Council [NE/H013679/1]
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00005094]
- National Science Foundation (NSF)
- Environmental Protection Agency (EPA) under NSF [EF-0830093]
- Center for the Environmental Implications of NanoTechnology (CEINT)
- Department of Energy (DOE)-Geosciences [DE-FG02-92ER14244]
- DOE [DE-AC02-98CH10886]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00005197, BBS/E/C/00005094] Funding Source: researchfish
- Natural Environment Research Council [NE/H013679/1] Funding Source: researchfish
- BBSRC [BBS/E/C/00005094, BBS/E/C/00005197] Funding Source: UKRI
- NERC [NE/H013679/1] Funding Source: UKRI
We examined the effects of amending soil with biosolids produced from a pilot-scale wastewater treatment plant containing a mixture of metal-based engineered nano-materials (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.
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