Ecotoxicological effects of copper oxide nanoparticles (nCuO) on the soil microbial community in a biosolids-amended soil.

Autor: Samarajeewa AD; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada. Electronic address: ajith.diassamarajeewa@canada.ca., Velicogna JR; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada., Schwertfeger DM; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada., Princz JI; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada., Subasinghe RM; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada., Scroggins RP; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada., Beaudette LA; Biological Assessment and Standardization Section, Environment and Climate Change Canada, 335 River Road, Ottawa, Ontario K1V 1C7, Canada.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 Apr 01; Vol. 763, pp. 143037. Date of Electronic Publication: 2020 Oct 16.
DOI: 10.1016/j.scitotenv.2020.143037
Abstrakt: This study represents a holistic approach in assessing the effects of copper oxide nanoparticles (nCuO) on microbial health and community structure in soil amended with municipal biosolids. The biosolids were amended with nCuO (<50 nm) and mixed into a sandy loam soil at measured Cu concentrations of 27, 54, 123, 265 and 627 mg Cu kg -1 soil. A suite of tests were used to assess the potential impact of nCuO on microbial growth, activity, and diversity. Microbial growth was determined by the heterotrophic plate count (HPC) method, while microbial diversity was assessed using both community level physiological profiling (CLPP) and 16S ribosomal DNA (rDNA) sequencing. Microbial activity was assessed by examining soil nitrification, organic matter decomposition, soil respiration (basal and substrate induced) and soil enzyme assays for dehydrogenase, phosphatase and β-glucosidase activities. As a readily soluble positive control, copper sulfate (CuSO 4 ) was used at measured Cu concentrations of 65, 140, 335 and 885 mg Cu kg -1 soil for select tests, and at the highest concentration for the remaining tests. Analysis on Cu bioavailability revealed that extractable Cu 2+ was higher in CuSO 4 -spiked soils than nCuO-spiked soils. At a nCuO exposure concentration of ≤265 mg Cu kg -1 soil, stimulatory effects were observed in nitrification, β-glucosidase and community level physiological profiling (CLPP) tests. nCuO showed no significant inhibitory effects on the soil microbial growth, activity or diversity at the highest concentration (i.e. 627 mg Cu kg -1 soil), with the exception of the dehydrogenase (i.e. ≥27 mg Cu kg -1 soil) and phosphatase (i.e. 627 mg Cu kg -1 soil) enzyme activities. In contrast, inhibition from CuSO 4 at 885 mg Cu kg -1 soil was observed in all tests with the exception of β-glucosidase enzyme activity. The growth of a Cu tolerant bacterium, Rhodanobacter sp., was observed at 885 mg Cu kg -1 soil (CuSO 4 ).
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Crown Copyright © 2020. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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