Effects of Ag and Ag2S nanoparticles on denitrification in sediments

Liu, Songqi; Wang, Chao; Hou, Jun; Wang, Peifang; Miao, Lingzhan; Fan, Xiulei; You, Guoxiang; Xu, Yi

doi:10.1016/j.watres.2018.02.067

Cited by 88 publications

(18 citation statements)

References 80 publications

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“…The water samples were taken first, and stored at 4 • C. The surface sediment (0-10 cm) was sampled by a Peterson Mud Extractor (WHL 15-HL-CN, Yaou, Beijing, China) which was deployed from a boat, and collected samples from the water sampling point at the bottom of the lake. Next, the sediment samples were placed in sterile sample boxes and brought back to the laboratory within 24 h. Based on our previous investigations, and other studies, the sediment grain size distribution of Lake Taihu is as follows: <5 µm 2.4-14.7%; 5-50 µm, 53.1-82.6%; 50-200 µm, 15.0-34.3% [35][36][37].…”

Section: Materials and Experimentsmentioning

confidence: 99%

Microbial Carbon Metabolic Functions in Sediments Influenced by Resuspension Event

Zhang

Ding

et al. 2020

Water

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Microorganisms in sediments are an important part of the aquatic ecosystem, and their functional activities are sensitive to external environmental pressure. Shallow lakes are characterized by frequent sediment resuspension events, leading to large amounts of nutrients being released. However, information about the potential impacts of sediment resuspension events on the functional activities of microbial communities is limited. In this study, the responses of microbial carbon metabolism in sediments under different wind–wave disturbance were analyzed by BIOLOG ECO microplates. The results showed that under four disturbance conditions (wind speeds of 0, 1.60, 3.62, and 14.10 m/s), the total carbon metabolism function of the sediment microbial community (represented as average well-color development, AWCD) remained unchanged (p > 0.05), and the final total AWCD value stabilized at about 1.70. However, compared with the control group, some specific carbon sources (e.g., amines and carboxylic acids) showed significant changes (p < 0.05). We found that short-term (8 h) resuspension events did not affect the total carbon metabolism of sediment microbial communities, while it affected the microbial utilization ability of some specific types of carbon sources. For example, we found that the microbial utilization capacity of polymers in the 14.10 m/s group was the best. This study provides a new insight into the carbon cycle process of shallow lake sediments that resuspension events will affect the carbon cycle process of sediments.

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Section: Materials and Experimentsmentioning

confidence: 99%

Microbial Carbon Metabolic Functions in Sediments Influenced by Resuspension Event

Zhang

Ding

et al. 2020

Water

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“…The sequences were clustered into operational taxonomic units (OTUs) at 97% sequence similarity with UPARSE (Edgar, 2013 ). Relative abundance (%), Chao1 richness, and Shannon's diversity index were estimated using the method described by Liu S. Q. et al ( 2018 ).…”

Section: Methodsmentioning

confidence: 99%

Silicon Application Modulates the Growth, Rhizosphere Soil Characteristics, and Bacterial Community Structure in Sugarcane

Deng

Zeng

et al. 2021

Front. Plant Sci.

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Silicon (Si) deficiency, caused by acidic soil and rainy climate, is a major constraint for sugarcane production in southern China. Si application generally improves sugarcane growth; however, there are few studies on the relationships between enhanced plant growth, changes in rhizosphere soil, and bacterial communities. A field experiment was conducted to measure sugarcane agronomic traits, plant nutrient contents, rhizosphere soil enzyme activities and chemical properties, and the rhizosphere bacterial community diversity and structure of three predominant sugarcane varieties under two Si treatments, i.e., 0 and 200 kg of silicon dioxide (SiO2) ha−1 regarded as Si0 and Si200, respectively. Results showed that Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0, and had an obvious impact on rhizosphere soil pH, available Si (ASi), available P (AP), available K (AK), total phosphorus (TP), and the activity of acid phosphatase. Furthermore, the relative abundances of Proteobacteria showed a remarkable increase in Si200, which may be the dominant group in sugarcane growth under Si application. Interestingly, the AP was noticed as a major factor that caused bacterial community structure differences between the two Si treatments according to canonical correspondence analysis (CCA). In addition, the association network analysis indicated that Si application enriched the rhizosphere bacterial network, which could be beneficial to sugarcane growth. Overall, appropriate Si application, i.e., 200 kg SiO2 ha−1 promoted sugarcane growth, changed rhizosphere soil enzyme activities and chemical properties, and bacterial community structures.

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“…[ 32 ] Evidence for decreases in the adverse effects of chemically transformed Ag NMs to produce Ag 2 S compared to untransformed NMs was found for a range of organisms including zebrafish, killifish, Caenorhabditis elegans , and soil denitrification processes. [ 32,45,46 ] The reduced toxicity of Ag 2 S compared to Ag has often been attributed to lower dissolution rates leading to lower concentration of released ions. However, the importance of speciation change to reducing dissolution and free Ag + concentrations is not always the dominant case.…”

Section: Assessing How Transformations Impact On Bioaccumulation and mentioning

confidence: 99%

“…For example, C. elegans and soil bacteria Ag 2 S NM dissolution was too low to explain observed toxic effects [ 47,48 ] and the activity and community composition of freshwater biofilms was altered by Ag 2 S NM exposure despite undetectable dissolution suggests that although reduced in potency the AgS NM still retain some level of inherent toxicity. [ 45 ]…”

Section: Assessing How Transformations Impact On Bioaccumulation and mentioning

confidence: 99%

Nanomaterial Transformations in the Environment: Effects of Changing Exposure Forms on Bioaccumulation and Toxicity

Spurgeon

Lahive

Schultz

2020

Small

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In the environment, nanomaterials (NMs) are subject to chemical transformations, such as redox reactions, dissolution, coating degradation, and organic matter, protein, and macromolecule binding, and physical transformations including homo or heteroagglomeration. The combination of these reactions can result in NMs with differing characteristics progressing through a functional fate pathway that leads to the formation of transformed NM functional fate groups with shared properties. To establish the nature of such effects of transformation on NMs, four main types of studies are conducted: 1) chemical aging for transformation of pristine NMs; 2) manipulation of test media to change NM surface properties; 3) aging of pristine NMs water, sediment, or soil; 4) NM aging in waste streams and natural environments. From these studies a paradigm of aging effects on NM uptake and toxicity can be developed. Transformation, especially speciation changes, largely results in reduced potency. Further reactions at the surface resulting in processes, such as ecocorona formation and heteroagglomeration may additionally reduce NM potency. When NMs of differing potency transform and enter environments, common transformation reaction occurring in receiving system may act to reduce the variation in hazard between different initial NMs leading to similar actual hazard under realistic exposure conditions.

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Effects of Ag and Ag2S nanoparticles on denitrification in sediments

Cited by 88 publications

References 80 publications

Microbial Carbon Metabolic Functions in Sediments Influenced by Resuspension Event

Microbial Carbon Metabolic Functions in Sediments Influenced by Resuspension Event

Silicon Application Modulates the Growth, Rhizosphere Soil Characteristics, and Bacterial Community Structure in Sugarcane

Nanomaterial Transformations in the Environment: Effects of Changing Exposure Forms on Bioaccumulation and Toxicity

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