Source and Pathway of Silver Nanoparticles to the Environment

Yin, Yongguang; Yu, Sujuan; Xiao-ya, Yang; Liu, Jingfu; Jiang, Guibin

doi:10.1007/978-3-662-46070-2_3

Cited by 14 publications

(12 citation statements)

References 128 publications

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“…AgNPs can reach soil through many different pathways such as unintended spills (Reidy et al, 2013), released from building facades coated with AgNPs (Kaegi et al, 2010) and sludge application of waste water treatment plants (WWTPs) (Schlich et al, 2017). AgNPs could be naturally formed in environment as a results of the biological and chemical reduction processes (Yin et al, 2015b). However, WWTP sludges that are applied to soil as soil fertilizer are considered to be the most significant pathway for AgNPs to enter the environment and it is estimated that more than 90% of AgNPs are released from various products originating from WWTP biomass (Mueller and Nowack, 2008).…”

Section: Environmental Pathways Of Silver Nanoparticlesmentioning

confidence: 99%

“…While AgNPs can be produced by natural processes (Yin et al 2015b), the majority of AgNPs found in the environment probably originate from anthropogenic sources (Yu et al 2013). Plastics and textiles containing AgNP-based biocides are expected to be responsible for up to 15% of the total-silver emissions to the aquatic environment in the European Union in 2010 (Kaegi et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…AgNPs enter the soil environment through different pathways including natural processes, like biological and chemical reduction of ionic silver, or anthropogenic sources which seem to be the most significant (Yin et al, 2015b). Former studies showed that AgNPs can also reach the soil through plant strengthening agents (Lorenz et al, 2011;Prasad et al, 2014;Thuesombat et al, 2014), slag from incinerators (Holder et al, 2013) and attached to sludge from sewage treatment plants (Lombi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…As more AgNPs based products are being produced, used and discarded, more AgNPs will be released into the environment (Bystrzejewska-Piotrowska et al, 2009;Fabrega et al, 2011;Luoma, 2008;Yin et al, 2015b). AgNPs can reach the soil environment through various pathways; the application of fertilizers that contain AgNPs (Batley et al, 2013), the application of sewage sediments as soil amendments (Schlich et al, 2013b), the disposal of biosolids (Benn and Westerhoff, 2008), wastes (Yin et al, 2015b), unintended spills of materials containing AgNPs (Yin et al, 2015a) or through the leaching of AgNP-containing products (Kaegi et al, 2010). After being released to the soil, AgNPs may be affected by soil physical processes as they might be redistributed by surface runoff (Kaegi et al, 2010), or transported downwards to ground water systems (Sagee et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Transport of silver nanoparticles in the soil-water nexus

Mahdi¹

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Silver nanoparticles (AgNPs) are used in a growing number of applications and products. Previous studies showed AgNPs can leach from these products to the environment. As a result of AgNPs leaching, sediment, soil and sludge-treated soils may be contaminated with AgNPs. Methods to detect, quantify and characterize AgNPs in soil are urgently needed. This study describes the development and validation of a method for the extraction, quantification and particle size determination of AgNPs in soils. The final method consists of pre-wetting the sample followed by an aqueous extraction, using sonication to re-suspend adsorbed AgNPs, and analysis of the aqueous extract with single particle ICP-MS. Validation of the method showed that the recovery of AgNPs spiked to soil was 44% for sandy soil and 42% for clayey soil. Although this recovery is relatively low, the repeatability and reproducibility values of the particle concentration were within the limits of Horwitz ratio, which makes the method suitable for its purpose. Further, the method concentration detection limit, LODc., is 5 µg kg-1 soil. The developed method can be applied in eco-toxicological and risk-assessments studies for AgNP in the soil environment.

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Section: Environmental Pathways Of Silver Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transport of silver nanoparticles in the soil-water nexus

Mahdi¹

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“…6 These AgNPs are usually localized extracellularly, 6 which would simplify the downstream processing. 7,8 Although the biosynthesis of AgNPs has been demonstrated with a variety of bacteria, fungi, and actinomycetes, 6 the mechanism of this process is yet to be elucidated, which will be helpful for the enhancement of AgNP synthesis 9 as well as our understanding of the biomineralization of silver and the formation of naturally occurring AgNPs. 10 Several studies suggested that nitrate reductase (NR) was involved in this bioreduction process.…”

Section: ■ Introductionmentioning

confidence: 99%

Superoxide-Mediated Extracellular Biosynthesis of Silver Nanoparticles by the Fungus Fusarium oxysporum

Yin

Xiao-ya

et al. 2016

Environ. Sci. Technol. Lett.

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The biosynthesis of silver nanoparticles (AgNPs) by microorganisms has become a hot topic in recent years, although its mechanism is still not well understood. Here we report the extracellular biosynthesis of AgNPs by the fungus Fusarium oxysporum through a superoxide-dependent mechanism. Reduction of Ag + to AgNPs in the extracellular region of F. oxysporum was verified by transmission electron microscopy, while the superoxide produced extracellularly by F. oxysporum was evidenced by chemiluminescence. We further demonstrated that the biosynthesis of AgNPs was inhibited by a superoxide scavenger or the inhibitor of NADH oxidases, and the addition of NADH significantly improved the formation of AgNPs. These results demonstrated that, for the first time, the fungus F. oxysporum can mediate the synthesis of AgNPs through the enzymatic generation of extracellular superoxide, which is helpful in understanding the biosynthesis of AgNPs and the biomineralization and transformation of silver and other metals or metalloids.

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Tracking the Transport of Silver Nanoparticles in Soil: a Saturated Column Experiment

Mahdi

Peters

Ploeg

et al. 2018

Water Air Soil Pollut

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Silver nanoparticles (AgNPs) can enter the environment when released from products containing them. As AgNPs enter soil, they are often retained in the soil profile and/or leached to the groundwater. This research assessed the transport of AgNPs in their “particle form” through the soil profile using a series of columns. Three soil types were put into soil columns: LSH (loam with high organic matter (OM)), LSL (loam with low OM), and Sand (no OM). The results showed that AgNP transport and retention in soil as well as particle size changes are affected by soil organic matter (OM) and the cation exchange capacity (CEC) of soil. OM affected the transport and retention of AgNPs. This was evident in the LSH columns where the OM concentration was the highest and the AgNP content the lowest in the soil layers and in the effluent water. The highest transported AgNP content was detected in the Sand columns where OM was the lowest. CEC had an impact on the particle size of the AgNPs that were retained in the soil layers. This was clear in columns packed with high CEC-containing soils (LSL and LSH) where AgNP particle size decreased more substantially than in the columns packed with sand. However, the decrease in AgNP sizes in the effluent water was less than the decrease in particle size of AgNPs transported through but retained in the soil. This means that the AgNPs that reached the effluent were transported directly from the first layer through the soil macropores. This work highlights the ability to track AgNPs at low concentrations (50 μg kg−1) and monitor the changes in particle size potential as the particles leach through soil all of which increases our knowledge about AgNP transport mechanisms in porous media.

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Source and Pathway of Silver Nanoparticles to the Environment

Cited by 14 publications

References 128 publications

Transport of silver nanoparticles in the soil-water nexus

Transport of silver nanoparticles in the soil-water nexus

Superoxide-Mediated Extracellular Biosynthesis of Silver Nanoparticles by the Fungus Fusarium oxysporum

Tracking the Transport of Silver Nanoparticles in Soil: a Saturated Column Experiment

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