Filser, Juliane
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Filser, Juliane
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Filser, Juliane
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Filser, J.
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Item-typ:Veröffentlichung, Cu(OH)2 nanorods undergo sulfidation in water: in situ formation of CuO nanorods as intermediates and enhanced toxicity to Escherichia coli(Springer, 2020-06-20)8 43 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Soil properties can evoke toxicity of copper oxide nanoparticles towards springtails at low concentrationsCopper oxide nanoparticles (CuO-NP) are used as an efficient alternative to conventional Cu in agriculture and might end up in soils. They show a high toxicity towards cells and microorganisms, but only low toxicity towards soil invertebrates. However, most existing soil ecotoxicological studies were conducted in a sandy reference soil and at test concentrations ≥100 mg Cu/kg soil. Therefore, there is a knowledge gap concerning the effect of soil texture on the toxicity of CuO-NP at lower, more realistic test concentrations. In our study, a sandy reference soil and three loamy soils were spiked with CuO-NP at up to four concentrations, ranging from 5 to 158 mg Cu/kg. We investigated 28-day reproduction as well as weight and Cu content after 14-day bioaccumulation and subsequent 14-day elimination for the springtail Folsomia candida. For the first time we analysed the size distribution of CuO-NP in aqueous test soil extracts by single particle-ICP-MS which revealed that the diameter of CuO-NP significantly increased with increasing concentration, but did not vary between test soils. Negative effects on reproduction were only observed in loamy soils, most pronounced in a loamy-acidic soil (−61%), and they were always strongest at the lowest test concentration. The observed effects were much stronger than reported by other studies performed with sandy soils and higher CuO-NP concentrations. In the same soil and concentration, a moderate impact on growth (−28%) was observed, while Cu elimination from springtails was inhibited. Rather than Cu body concentration, the diameter of the CuO-NP taken up, as well as NP-clay interactions might play a crucial role regarding their toxicity. Our study reports for the first time toxic effects of CuO-NP towards a soil invertebrate at a low, realistic concentration range. The results strongly suggest including lower test concentrations and a range of soil types in nanotoxicity testing.Wissenschaftlicher ArtikelBand:27016 18 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Sulfidation of sea urchin-like zinc oxide nanospheres: Kinetics, mechanisms, and impacts on growth of Escherichia coliNanoscale zinc oxide (n-ZnO) with different morphology and sizes has been used in personal care products due to their antibacterial properties, resulting in discharge of n-ZnO into the environment with potential toxic effect to ecological systems. Sulfidation is one of pathways of transformation of n-ZnO, but a very limited information on the conversion of n-ZnO under sulfidic environment with special morphology such as sea urchin-like zinc oxide nanospheres (ZnO-NSs) is available to know the potential environmental risks of n-ZnO. Herein, sea urchin-like ZnO-NSs with an average size of 78 nm were synthesized and adopted as the model n-ZnO of special morphology. The ZnO-NPs at average sizes of 71 nm (ZnO-NPs-71), 48 nm (ZnO-NPs-48), and 17 nm (ZnO-NPs-17) nm were used to examine possible differences in the sulfidation between the sea urchin-like ZnO-NSs and ZnO-NPs. A new analytical method selectively dissolving ZnO over ZnS in partially sulfidized n-ZnO was developed and applied to understand the kinetics of n-ZnO sulfidation. The sulfidation rate constant (ks) of sea urchin-like ZnO-NSs was 2.9 × 10−3 h−1, comparable to that of ZnO-NPs-71 (4.1 × 10−3 h−1), but much lower than those of ZnO-NPs-48 (20.1 × 10−3 h−1) and ZnO-NPs-17 (67.8 × 10−3 h−1). This might be attributed to the differences in the specific surface area; ks positively correlated with the specific surface area (R2 = 0.97). Natural organic matter (NOM) decreased dissolution and sulfidation of the sea urchin-like ZnO-NSs. Aggregate ZnS nanocrystals instead of the original sea urchin-like ZnO-NSs were observed. We proposed that sea urchin-like ZnO-NSs were transformed to ZnS through a dissolution-precipitation pathway, consistent with the sulfidation pathway of ZnO-NPs. Sulfidation drastically reduced toxicity of sea urchin-like ZnO-NSs to Escherichia coli due to negligible dissolution of ZnS nanocrystals. These results greatly improved our understanding of the transformation and potential risks of n-ZnO with special morphology.Wissenschaftlicher ArtikelBand:74126 30 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Assessing the Impacts of Cu(OH)2 Nanopesticide and Ionic Copper on the Soil Enzyme Activity and Bacterial Community(American Chemical Society, 2020-02-28)15 22 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Biotic and Abiotic Interactions in Freshwater Mesocosms Determine Fate and Toxicity of CuO Nanoparticles(American Chemical Society, 2023-08-10); ; ; ; Transformation, dissolution, and sorption of copper oxide nanoparticles (CuO-NP) play an important role in freshwater ecosystems. We present the first mesocosm experiment on the fate of CuO-NP and the dynamics of the zooplankton community over a period of 12 months. Increasingly low (0.08-0.28 mg Cu L) and high (0.99-2.99 mg Cu L) concentrations of CuO-NP and CuSO (0.10-0.34 mg Cu L) were tested in a multiple dosing scenario. At the high applied concentration (CuO-NP_H) CuO-NP aggregated and sank onto the sediment layer, where we recovered 63% of Cu applied. For the low concentration (CuO-NP_L) only 41% of applied copper could be recovered in the sediment. In the water column, the percentage of initially applied Cu recovered was on average 3-fold higher for CuO-NP_L than for CuO-NP_H. Zooplankton abundance was substantially compromised in the treatments CuSO ( < 0.001) and CuO-NP_L ( < 0.001). Community analysis indicated that Cladocera were most affected (b = -0.49), followed by Nematocera (b = -0.32). The abundance of Cladocera over time and of Dixidae in summer was significantly reduced in the treatment CuO-NP_L ( < 0.001; < 0.05) compared to the Control. Our results indicate a higher potential for negative impacts on the freshwater community when lower concentrations of CuO-NP (<0.1 mg Cu L) enter the ecosystem.Wissenschaftlicher ArtikelBand:57Heft:3335 40 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Long-term effects of silver nanoparticles (NM-300K) and soil amendments on soil respiration and mesofauna in a semi-field experimentThe toxicity of silver nanoparticles (AgNPs) has been intensely studied, due to their increased applications in various products. However, most studies were conducted under laboratory conditions and short periods of time. Here we focus on how AgNPs at a concentration of 30 mg kg−1 soil behave under semi-field conditions in a long-term study. The effects of AgNPs (NM-300K) and AgNO3 in three soil treatments with and without additives on microbial biomass, mesofauna and the reproduction of Folsomia candida were studied. We measured silver concentrations by atomic absorption spectrometry. After 200, 400 and 600 days, we recorded soil microbial biomass by substrate-induced respiration, extracted the colonizing mesofauna and used part of the soil for reproduction tests with F. candida. Over the time course of the entire experiment, 71.2% of the added silver was found in the sampling soils, 9.6% in the surrounding soil, and 0.3% in the drainage water. Only in the unamended soil AgNPs and AgNO3 showed inhibitory effects that decreased over time, although more silver was retained in the amended soils. Soil mesofauna abundance was only temporarily reduced by AgNO3 but not by AgNPs. By the end of the experiment no more negative effects on the measured microbial biomass were observed. Biochar and compost as soil amendments demonstrated excellent remediation potential for AgNPs, both for medium- and long-term experiments.Wissenschaftlicher ArtikelBand:10Heft:826 26 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Identification and Speciation of Nanoscale Silver in Complex Solid Matrices by Sequential Extraction Coupled with Inductively Coupled Plasma Optical Emission Spectrometry(American Chemical Society, 2021-01-13)21 30