Variable silver nanoparticle toxicity to Daphnia in boreal lakes

Conine, Andrea L.; Rearick, Daniel C.; Xenopoulos, Marguerite A.; Frost, Paul C.

doi:10.1016/j.aquatox.2017.09.004

Cited by 9 publications

(5 citation statements)

References 37 publications

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“…have been frequently studied. However, they are usually studied separately in controlled laboratory experiments and cannot account for the potential interactions between all of these different factors and the complexity found in natural waters (Conine et al, 2017). It is also important to consider seasonal changes in natural systems since they influence the condition of the organisms and thus potentially also their sensitivity towards contaminants (Conine et al, 2017).…”

Section: Linking Toxicity To Exposure Characterizationmentioning

confidence: 99%

Growth inhibition in Raphidocelis subcapita – Evidence of nanospecific toxicity of silver nanoparticles

2019

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Silver, known for its antibacterial properties and for its toxicity to aquatic organisms, is one of the most frequently used nanomaterials and silver nanoparticles can be found in a range of consumer products as well as medical applications. The present study investigated the toxicity of three different nanomaterials (Mesosilver, NM300K and NM302) and AgNO 3 , in the algae Raphidocelis subcapitata. Exposures in the low µg L -1 range were combined with characterization of exposure media to determine whether differences in toxicity could be linked to changes in Ag speciation. All tested Ag compounds, except the NM302 Ag rods, reduced growth in the following order AgNO 3 ≥ M-Ag > NM300K > NM302 with 50 % effect concentrations of 7.09 (3.83-10.52), 9.7 (range not calculated) and 24.18 (15.66-98.16) µg L -1 , for AgNO 3 , Mesosilver and NM300K, respectively. Characterization of exposure media showed that both concentration and time influenced the speciation and stability of Ag in test media, regardless of Ag source, and also affected the toxicity to R. subcapitata. In both AgNO 3 and Mesosilver exposure the toxicity was correlated with the presence of Ag(I) (< 10 kDa), however levels of Ag(I) were too low to account for the observed Mesosilver effects, indicating a nanospecific contribution. Nanospecific toxicity was also observed for NM300K after 24 h of exposure, however the algae population recovered over time probably due to changes in exposure caused by aggregation of the nanoparticles.

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Section: Linking Toxicity To Exposure Characterizationmentioning

confidence: 99%

Growth inhibition in Raphidocelis subcapita – Evidence of nanospecific toxicity of silver nanoparticles

2019

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“…The environmental variables studied in water from a lake (Lake (L) 979 at the IISD-Experimental Lakes Area (IISD-ELA) in northern Ontario, Canada) were conductivity, dissolved nutrients, bacterial abundance, and algal biomass. The toxicity was determined to be highly variant among the lakes (p < 0.001) [138].…”

Section: Nanoparticles Toxicity Studiesmentioning

confidence: 99%

A Brief Insight into the Toxicity Conundrum: Modeling, Measuring, Monitoring and Evaluating Ecotoxicity for Water Quality towards Environmental Sustainability

et al. 2023

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In view of the continuous increment of industrial residues, the risk associated with chemical toxicity in the environment has piqued the interest of researchers in pursuit of an alternative methodology for mitigating the apparent toxicity of chemicals. Over the past decade, the applicability of toxicity models and the evaluation of the apparent toxicity of chemicals have been examined for achieving sustainability of the environment and improving water quality. The prediction of toxicant effects with reasonable accuracy in organisms of water bodies and other environmental compartments lies in the application of a chemical toxicity model with further risk assessment analysis. This review summarizes well-known and recent advances of modeling techniques to evaluate and monitor toxicity in the environment. Chemical toxicity models such as the individual-based concentration addition (CA), independent action (IA) and whole-mixture-based concentration addition-independent action (CAIA) are considered, as well as their environmental applications, specific case studies, and further research needs towards sustainability. The gap that needs to be overcome in toxicity studies for the environmental sustainability is noted based on the aspects of environmental chemistry and ecotoxicology, sufficient laboratory equipment, data availability and resources for relevant social parameters needed for investigation.

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“…DOM plays a role in the transport and toxicity of metals and this varies based on its chemical composition DOM is a complexing agent in natural waters, plays a role in the transport of metals and hydrophobic compounds (e.g., pesticides) and as such is an important factor mitigating water-borne metal toxicity. Toxicity measures (e.g., LC50) vary substantially among different DOM sources even for similar DOC concentrations (e.g., Haitzer et al 1998;Conine et al 2017). DOM properties measured using fluorescent fractions explain considerable variability in the protective effects against metal toxicity (e.g., Al-Reasi et al 2012).…”

Section: The Chemical Composition Of the Dom Pool Can Modify Nutrient Cyclesmentioning

confidence: 99%

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

et al. 2021

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Dissolved organic matter (DOM) is recognized for its importance in freshwater ecosystems, but historical reliance on DOM quantity rather than indicators of DOM composition has led to an incomplete understanding of DOM and an underestimation of its role and importance in biogeochemical processes. A single sample of DOM can be composed of tens of thousands of distinct molecules. Each of these unique DOM molecules has their own chemical properties and reactivity or role in the environment. Human activities can modify DOM composition and recent research has uncovered distinct DOM pools laced with human markers and footprints. Here we review how land use change, climate change, nutrient pollution, browning, wildfires, and dams can change DOM composition which in turn will affect internal processing of freshwater DOM. We then describe how human-modified DOM can affect biogeochemical processes. Drought, wildfires, cultivated land use, eutrophication, climate change driven permafrost thaw, and other human stressors can shift the composition of DOM in freshwater ecosystems increasing the relative contribution of microbial-like and aliphatic components. In contrast, increases in precipitation may shift DOM towards more relatively humic-rich, allochthonous forms of DOM. These shifts in DOM pools will likely have highly contrasting effects on carbon outgassing and burial, nutrient cycles, ecosystem metabolism, metal toxicity, and the treatments needed to produce clean drinking water. A deeper understanding of the links between the chemical properties of DOM and biogeochemical dynamics can help to address important future environmental issues, such as the transfer of organic contaminants through food webs, alterations to nitrogen cycling, impacts on drinking water quality, and biogeochemical effects of global climate change.

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Variable silver nanoparticle toxicity to Daphnia in boreal lakes

Cited by 9 publications

References 37 publications

Growth inhibition in Raphidocelis subcapita – Evidence of nanospecific toxicity of silver nanoparticles

Growth inhibition in Raphidocelis subcapita – Evidence of nanospecific toxicity of silver nanoparticles

A Brief Insight into the Toxicity Conundrum: Modeling, Measuring, Monitoring and Evaluating Ecotoxicity for Water Quality towards Environmental Sustainability

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

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