Bioavailability of silver and silver sulfide nanoparticles to lettuce (Lactuca sativa): Effect of agricultural amendments on plant uptake

Doolette, Casey L.; McLaughlin, Michael J.; Kirby, Jason K.; Navarro, Divina A.

doi:10.1016/j.jhazmat.2015.08.012

Cited by 103 publications

(60 citation statements)

References 45 publications

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“…However, these parameters are rarely reported in transformation studies, making comparisons difficult. Whereas some studies investigating AgNP transformations in sludge within pilot‐scale WWTPs have observed partial or incomplete sulfidation , others have documented complete sulfidation . Given the detection limit of X‐ray absorption spectroscopy (XAS) and X‐ray fluorescence (XRF) speciation techniques commonly employed , it is likely that speciation analyses conducted on bulk soil (or sludge) are not sensitive enough to identify (or quantify) speciation differences occurring within a biologically relevant fraction, namely the dispersible, nanoscale fraction.…”

Section: Resultsmentioning

confidence: 99%

The toxicity of silver to soil organisms exposed to silver nanoparticles and silver nitrate in biosolids‐amended field soil

Jesmer

Velicogna

Schwertfeger

et al. 2017

Enviro Toxic and Chemistry

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The use of engineered silver nanoparticles (AgNPs) is widespread, with expected release to the terrestrial environment through the application of biosolids onto agricultural lands. The toxicity of AgNPs and silver nitrate (AgNO ; as ionic Ag ) to plant (Elymus lanceolatus and Trifolium pratense) and soil invertebrate (Eisenia andrei and Folsomia candida) species was assessed using Ag-amended biosolids applied to a natural sandy loam soil. Bioavailable Ag in soil samples was estimated using an ion-exchange technique applied to KNO soil extracts, whereas exposure to dispersible AgNPs was verified by single-particle inductively coupled plasma-mass spectrometry and transmission electron microscopy-energy dispersive X-ray spectroscopy analysis. Greater toxicity to plant growth and earthworm reproduction was observed in AgNP exposures relative to those of AgNO , whereas no difference in toxicity was observed for F. candida reproduction. Transformation products in the AgNP-biosolids exposures resulted in larger pools of extractable Ag than those from AgNO -biosolids exposures, at similar total Ag soil concentrations. The results of the present study reveal intrinsic differences in the behavior and bioavailability of the 2 different forms of Ag within the biosolids-soils pathway. The present study demonstrates how analytical methods that target biologically relevant fractions can be used to advance the understanding of AgNP behavior and toxicity in terrestrial environments. Environ Toxicol Chem 2017;36:2756-2765. © 2017 Crown in the Right of Canada. Published Wiley Periodicals Inc., on behalf of SETAC.

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Section: Resultsmentioning

confidence: 99%

The toxicity of silver to soil organisms exposed to silver nanoparticles and silver nitrate in biosolids‐amended field soil

Jesmer

Velicogna

Schwertfeger

et al. 2017

Enviro Toxic and Chemistry

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“…As with anoxic aquatic systems, a wide variety of Ag NMs will largely transform into insoluble Ag 2 S NMs in a range of WWTP configurations (Lombi et al ; Ma et al ; Pradas del Real et al ; Wang et al ), although Ag‐cysteine and AgCl are also possible transformation end products. Considering that non‐labile transformation end products such as AgCl and Ag 2 S are expected to be stable in the environment and to have relatively low bioavailability (Lombi et al ; Donner et al ; Doolette et al , ), the risk to terrestrial ecosystems posed by Ag NMs would appear to be low, although uncertainties related to longer‐term transformations, dosimetry, are also relevant. This conclusion has been further supported by soil‐based studies demonstrating that Ag 2 S NMs presented minimal hazard to plant–microorganism symbioses (Judy et al , ), crop plants (Doolette et al ; Wang et al ), soil microorganisms (Judy et al ; Doolette et al ; Moore et al ), and soil invertebrates (Starnes et al , ).…”

Section: Bioaccumulation and Toxicity Of Nms To Soil Organismsmentioning

confidence: 99%

Nanomaterials in the environment: Behavior, fate, bioavailability, and effects—An updated review

Lead

Batley

Alvarez

et al. 2018

Enviro Toxic and Chemistry

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The present review covers developments in studies of nanomaterials (NMs) in the environment since our much cited review in 2008. We discuss novel insights into fate and behavior, metrology, transformations, bioavailability, toxicity mechanisms, and environmental impacts, with a focus on terrestrial and aquatic systems. Overall, the findings were that: 1) despite substantial developments, critical gaps remain, in large part due to the lack of analytical, modeling, and field capabilities, and also due to the breadth and complexity of the area; 2) a key knowledge gap is the lack of data on environmental concentrations and dosimetry generally; 3) substantial evidence shows that there are nanospecific effects (different from the effects of both ions and larger particles) on the environment in terms of fate, bioavailability, and toxicity, but this is not consistent for all NMs, species, and relevant processes; 4) a paradigm is emerging that NMs are less toxic than equivalent dissolved materials but more toxic than the corresponding bulk materials; and 5) translation of incompletely understood science into regulation and policy continues to be challenging. There is a developing consensus that NMs may pose a relatively low environmental risk, but because of uncertainty and lack of data in many areas, definitive conclusions cannot be drawn. In addition, this emerging consensus will likely change rapidly with qualitative changes in the technology and increased future discharges.

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“…The plant biomass of wheat ( Triticum aesticum L.) and cowpea ( Vigna unguiculata L. Walp) decreased following a two week exposure to Ag 2 S-NPs at 6 mg Ag L -1 [5]. At lower Ag concentrations (1.3 mg kg -1 ), the biomass of lettuce ( Lactuca sativa ) was not affected by Ag 2 S-NPs [6] but there was evidence of effects at higher doses. In addition, Ag 2 S-NPs (at 10 mg Ag L -1 ) have also been shown to increase the mortality of the model soil organism, Caenorhabditis elegans , by 20% [7].…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Sensitivity of Soil Microbial Communities to Silver Sulfide Nanoparticles Using Metagenome Sequencing

et al. 2016

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Soils are a sink for sulfidised-silver nanoparticles (Ag2S-NPs), yet there are limited ecotoxicity data for their effects on microbial communities. Conventional toxicity tests typically target a single test species or function, which does not reflect the broader community response. Using a combination of quantitative PCR, 16S rRNA amplicon sequencing and species sensitivity distribution (SSD) methods, we have developed a new approach to calculate silver-based NP toxicity thresholds (HCx, hazardous concentrations) that are protective of specific members (operational taxonomic units, OTUs) of the soil microbial community. At the HC20 (80% of species protected), soil OTUs were significantly less sensitive to Ag2S-NPs compared to AgNPs and Ag+ (5.9, 1.4 and 1.4 mg Ag kg-1, respectively). However at more conservative HC values, there were no significant differences. These trends in OTU responses matched with those seen in a specific microbial function (rate of nitrification) and amoA-bacteria gene abundance. This study provides a novel molecular-based framework for quantifying the effect of a toxicant on whole soil microbial communities while still determining sensitive genera/species. Methods and results described here provide a benchmark for microbial community ecotoxicological studies and we recommend that future revisions of Soil Quality Guidelines for AgNPs and other such toxicants consider this approach.

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Bioavailability of silver and silver sulfide nanoparticles to lettuce (Lactuca sativa): Effect of agricultural amendments on plant uptake

Cited by 103 publications

References 45 publications

The toxicity of silver to soil organisms exposed to silver nanoparticles and silver nitrate in biosolids‐amended field soil

The toxicity of silver to soil organisms exposed to silver nanoparticles and silver nitrate in biosolids‐amended field soil

Nanomaterials in the environment: Behavior, fate, bioavailability, and effects—An updated review

Quantifying the Sensitivity of Soil Microbial Communities to Silver Sulfide Nanoparticles Using Metagenome Sequencing

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