Significant contribution of metastable particulate organic matter to natural formation of silver nanoparticles in soils

Huang, Yinbo; Qian, Tingting; Dang, Fei; Yin, Yongguang; Li, Min; Zhou, Dongmei

doi:10.1038/s41467-019-11643-6

Cited by 72 publications

(42 citation statements)

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“…For Europe input rate via WWTP residues to soils is estimated 0.37 tons.y -1 and 4.7 tons.y -1 to large rivers (Wang et al, 2018). In addition to anthropogenic sources, silver nanoparticles could be also naturally formed from the silver ions in the water or in soils as recently reported by Huang et al (2019) for soils and Wimmer et. al.…”

Section: Introductionmentioning

confidence: 78%

“…4 and S2). Ag NPs (ng/L) DOC (mg/L) R 2 = 0.88 p = 0.00002 been described in several studies (Topuz and Talinli, 2015;Yu et al, 2018;Zhang and Jiang, 2017;Wimmer et al, 2018;Huang et al, 2019). High NOM concentration inhibits the dissolution and aggregations of Ag-NPs when released into surface waters, thus making Ag-NPs more persistent in such natural matrices.…”

Section: Field Mechanisms and The Sources Accounting For The Variatiomentioning

confidence: 96%

“…The major characteristic of forested watershed is that its lithology corresponds to a sandy soil vs. carbonated soils for the other watersheds and that it is richer in carbon in the top-soil (Bonnot, 2015). Recent studies have shown that soils organic matter could significantly contribute to the formation of silver nanoparticles in soils (Huang et al, 2019) . The low number of inhabitants and the favored production of Ag-NPs by soils organic matter would account for this higher number.…”

Section: Effect Of Land-use On Exportation Fluxesmentioning

confidence: 99%

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Flow and fate of silver nanoparticles in small French catchments under different land-uses: The first one-year study

et al. 2020

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This study focused on surface waters from three small creeks, within the Seine River watershed, which are characterized by different land-uses, namely forested, agricultural and urban. Silver nanoparticles (Ag-NPs) in these waters were detected and quantified by single-particle ICPMS during one-year of monthly sampling. Their temporal and spatial variations were investigated. Ag-NPs, in the three types of surface water, were found to range from 1.5 x10 7 to 2.3 x 10 9 particles L-1 and from 0.4 to 28.3 ng L-1 at number and mass concentrations, respectively. These values are in consistent with the very few previous studies. In addition, the role of factors driving process and potential sources are discussed with correlations between Ag-NPs concentrations and biogeochemical parameters, like dissolved organic carbon concentration and divalent cations concentrations. For the forested watershed NOM controls the stability (number and mass) of the Ag-NPs as recently observed in the field in lake water in Germany. In the case of the agricultural and urban watersheds major cations such as Ca would control the number and mass of Ag-NPs. Dilution processes are rejected as conductivity and Clions do not show significant correlations with Ag-NPs or other major geochemical parameters. The specific exportation rates of Ag-NPs for artificial, agricultural and forested areas were calculated based on the monthly data for the full year and are equal to 5.5 ± 3.0, 0.5 ± 0.3 and 0.2 ± 0.2 gy-1 km-2 , respectively. These data suggest a constant release of Ag-NPs from consumer products into freshwaters in artificial areas, for instance, from textiles, washing machines, domestic tap-water filters, outdoor paints. These first data of Ag-NPs fluxes in surface waters of France enlarge the very limited database of field measurements. Moreover, for the first time, the influence of time, landuse and aquatic geochemistry parameters on Ag-NPs in real natural water samples is reported. It is also helpful to further understand the fate and the process of Ag-NPs in natural waters, as well as to the ecotoxicity studies in real-world environment.

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Section: Introductionmentioning

confidence: 78%

Section: Field Mechanisms and The Sources Accounting For The Variatiomentioning

confidence: 96%

Section: Effect Of Land-use On Exportation Fluxesmentioning

confidence: 99%

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Flow and fate of silver nanoparticles in small French catchments under different land-uses: The first one-year study

et al. 2020

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“…The interaction with multiple particles may increase the overall size of the nanoparticle or possibly induce aggregation. These interactions can be physical or chemical or both (Sani-Kast et al 2017;Huang et al 2019). For example, silver ions, likely produced from dissolution of silver nanoparticles under oxidic conditions, would interact with sulfur-containing groups of organic matter through complexation (Ubaid et al 2019).…”

Section: Figmentioning

confidence: 99%

Copper, silver, and titania nanoparticles do not release ions under anoxic conditions and release only minute ion levels under oxic conditions in water: Evidence for the low toxicity of nanoparticles

et al. 2020

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It is widely assumed that the discharge of nanoparticles into the environment may cause adverse effects on organisms. Nonetheless, so far most nanoparticles have demonstrated little to no observed hazards in multiple biological test systems. It is not until nanoparticles undergo transformations, e.g., release of metal ions, that most environmental toxicities are induced, yet the ionization of nanoparticles in natural oxic and anoxic conditions is poorly known. We hypothesized that in anaerobic conditions, where oxidation is absent or limited, metal nanoparticles should not release metal ions. We investigated the transformation of three commercially produced materials, i.e., copper nanoparticles, silver nanoparticles, and titania nanocrystals with an average particle size of 50 nm. The nanoparticles were subjected to different environmental conditions including oxic/anoxic suspension, incubation with natural organic matter, and pH gradient, then subsequently analyzed for zeta potential, hydrodynamic diameter, concentration of released metal ions, and generation of reactive oxygen species. Transmission electron microscopy was used to assess morphological changes. Under oxic conditions, results show that only 9.4 μg/mL of copper ions and 6.9 μg/mL of silver ions were released from nanoparticles, when continuously stirred over 48 h. These levels are low compared to levels found in natural media. Moreover, under anoxic conditions, an insignificant amount of copper ions of 0.9 μg/mL and silver ions, of 0.2 μg/mL, were released. For titania nanoparticle, less than 0.05 μg/ mL ions were released under either oxic or anoxic conditions. Overall, our findings reveal the absence of ion release under anoxic conditions, and the very low levels of ion released under oxic conditions. As a consequence, the toxicity of Cu, Ag, and Ti nanoparticles should be very low in natural media.

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“…[46][47][48][49] One of the important steps is the degradation of extracellular matrix (ECM), which is especially important for liver cancer. [50][51][52] The invasion and metastasis that result after ECM degradation are largely related to integrin and matrix metalloproteinases (MMPs). [53][54][55] Integrin not only mediates the adhesion of HCC cells to other HCC cells and HCC cells to the ECM but also participates in the chemotaxis, proliferation, and apoptosis of tumor cells, and thus, integrin involvement extends nearly throughout the entire process of HCC cell invasion and metastasis.…”

Section: Matrix Metalloproteinase Inhibitorsmentioning

confidence: 99%

New Therapeutic Options for Advanced Hepatocellular Carcinoma

Liu

et al. 2020

Cancer Control

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Hepatocellular carcinoma (HCC), one of the most common lethal diseases in the world, has a 5-year survival rate of only 7%. Hepatocellular carcinoma has no symptoms in the early stage but obvious symptoms in the late stage, leading to delayed diagnosis and reduced treatment efficacy. In recent years, as the scope of HCC research has increased in depth, the clinical development and application of molecular targeted drugs and immunotherapy drugs have brought new breakthroughs in HCC treatment. Targeted therapy drugs for HCC have high specificity, allowing them to selectively kill tumor cells and minimize damage to normal tissues. At present, these targeted drugs are mainly classified into 3 categories: small molecule targeted drugs, HCC antigen-specific targeted drugs, and immune checkpoint targeted drugs. This article reviews the latest research progress on the targeted drugs for HCC.

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Significant contribution of metastable particulate organic matter to natural formation of silver nanoparticles in soils

Cited by 72 publications

References 50 publications

Flow and fate of silver nanoparticles in small French catchments under different land-uses: The first one-year study

Flow and fate of silver nanoparticles in small French catchments under different land-uses: The first one-year study

Copper, silver, and titania nanoparticles do not release ions under anoxic conditions and release only minute ion levels under oxic conditions in water: Evidence for the low toxicity of nanoparticles

New Therapeutic Options for Advanced Hepatocellular Carcinoma

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