Stability of titania nanoparticles in soil suspensions and transport in saturated homogeneous soil columns

Fang, Jing; Shan, Xiao-quan; Wen, Bin; Lin, Jin‐Ming; Owens, Gary

doi:10.1016/j.envpol.2008.11.006

Cited by 333 publications

(218 citation statements)

References 39 publications

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“…The ionic strength of the soil solution also influences the tendency of particles to sorb to the soil. Higher ionic strength decreases the repulsive forces between particles and between particles and the soil surfaces, in accordance with the Derjaguin, Landau, Verwey, and Overbeek theory [61], leading to increased aggregation and sorption. For example, Ben-Moshe et al [48] showed that the addition of sodium chlorate reduced the electrostatic repulsion between particles (Fe 2 O 3 , TiO 2 , CuO, and ZnO NPs), resulting in aggregation and, thus, reduced mobility in a glass bead column.…”

Section: Transport Of Metal-based Nps In Soilsupporting

confidence: 77%

“…The aggregation rate of TiO 2 NPs in soil suspensions has been found to be negatively correlated to soil characteristics such as dissolved organic matter and clay contents, and positively correlated to the ionic strength, zeta potential, and pH [61]. Nanoparticles sorbed less strongly to soils of low ionic strength and high dissolved organic matter content, suggesting that these factors may affect the bioavailability of metal-based NPs in soils, assuming that bioavailability is related to the particle fraction suspended in the pore water and not the fraction associated with the soil matrix.…”

Section: Soil Propertiesmentioning

confidence: 99%

“…Humic substances are negatively charged at environmental pHs, and thus their sorption will make the overall particle-humic conglomerate negatively charged [63]. This may increase particle stability in solution, reducing aggregation and settling [48,61]. The alteration of the surface charge may also decrease particle affinity for cell membranes and thus reduce their bioavailability and uptake [64].…”

Section: Soil Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Metal‐based nanoparticles in soil: Fate, behavior, and effects on soil invertebrates

Tourinho

Gestel²,

Lofts

et al. 2012

Enviro Toxic and Chemistry

401

229

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Abstract-Metal-based nanoparticles (NPs) (e.g., silver, zinc oxide, titanium dioxide, iron oxide) are being widely used in the nanotechnology industry. Because of the release of particles from NP-containing products, it is likely that NPs will enter the soil compartment, especially through land application of sewage sludge derived from wastewater treatment. This review presents an overview of the literature dealing with the fate and effects of metal-based NPs in soil. In the environment, the characteristics of NPs (e.g., size, shape, surface charge) and soil (e.g., pH, ionic strength, organic matter, and clay content) will affect physical and chemical processes, resulting in NP dissolution, agglomeration, and aggregation. The behavior of NPs in soil will control their mobility and their bioavailability to soil organisms. Consequently, exposure characterization in ecotoxicological studies should obtain as much information as possible about dissolution, agglomeration, and aggregation processes. Comparing existing studies is a challenging task, because no standards exist for toxicity tests with NPs. In many cases, the reporting of associated characterization data is sparse, or missing, making it impossible to interpret and explain observed differences in results among studies. Environ. Toxicol. Chem.

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Section: Transport Of Metal-based Nps In Soilsupporting

confidence: 77%

Section: Soil Propertiesmentioning

confidence: 99%

Section: Soil Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Metal‐based nanoparticles in soil: Fate, behavior, and effects on soil invertebrates

Tourinho

Gestel²,

Lofts

et al. 2012

Enviro Toxic and Chemistry

401

229

View full text Add to dashboard Cite

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“…nTiO2 normally exist as aggregates in water instead of individual nanoscale particles (Chen et al, 2012;French et al, 2009;Lin et al, 2010;Lee et al, 2015). Aggregation of nTiO2 are influenced by factors such as pH, ionic strength, surfactants and natural organic matters (NOM) such as humic acid (HA) (Hsu and Chang, 2000;Tkachenko et al, 2006, Dunphy Guzman et al, 2006Fang et al, 2009;French et al, 2009, Godinez andDarnault, 2011). nTiO2 water suspensions are stable when pH deviates from the point of zero charge (PZC) of nTiO2, and NOM was found to enhance nTiO2 stability via repulsive electrostatic and steric forces afforded by NOM adsorption to nTiO2 (Chen et al, 2012;Chen and Elimelech, 2007;Espinasse et al, 2007;Navarro et al, 2008).…”

Section: Stability Of Ntio2 and Their Attachment To Sand Collectormentioning

confidence: 99%

Stability of nTiO 2 particles and their attachment to sand: Effects of humic acid at different pH

Cheng

2016

Science of The Total Environment

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Influence of humic acid (HA) on stability and attachment of nTiO2 particles to sand was investigated. Results showed that HA can either promote or hinder nTiO2 stability, depending on pH and HA concentration. HA can either enhance or reduce nTiO2 attachment to Fe oxyhydroxide coating at pH 5, depending on HA concentration.Results further showed that at pH 5, Fe oxyhydroxide coating reduced nTiO2 attachment to sand in the absence of HA but increased nTiO2 attachment in the presence of low concentration of HA. Derjaguin-Landau-Verwey-Overbeek (DLVO) theory was invoked to analyze particle-to-particle and particle-to-sand interactions in order to elucidate the roles of pH, HA, quartz, and Fe coating in controlling nTiO2 stability and attachment. Overall, this study showed that changes in zeta potential of nTiO2 and Fe coating due to pH changes and/or HA adsorption are the key factors that influence stability and attachment of nTiO2.iii ACKNOWLEDGEMENTS

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“…Although this is also well known for traditional chemicals, some challenges relate specifically to ENMs. Natural soils represent a large and reactive sink, and recent studies have shown that natural soil will filter ENMs during transport through the soil matrix, particularly if the clay content or ionic strength is elevated [75][76][77]. Likely the bioavailability of ENMs to soil organisms, as for aquatic sedimentary tests, will differ for natural and artificial soils, and the method of dosing the soil will alter this bioavailability.…”

Section: Behavior Of Enms In the Soil Matrixmentioning

confidence: 99%

Ecotoxicity test methods for engineered nanomaterials: Practical experiences and recommendations from the bench

Handy

Cornelis

Fernandes

et al. 2011

Enviro Toxic and Chemistry

302

236

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Abstract-Ecotoxicology research is using many methods for engineered nanomaterials (ENMs), but the collective experience from researchers has not been documented. This paper reports the practical issues for working with ENMs and suggests nano-specific modifications to protocols. The review considers generic practical issues, as well as specific issues for aquatic tests, marine grazers, soil organisms, and bioaccumulation studies. Current procedures for cleaning glassware are adequate, but electrodes are problematic. The maintenance of exposure concentration is challenging, but can be achieved with some ENMs. The need to characterize the media during experiments is identified, but rapid analytical methods are not available to do this. The use of sonication and natural/synthetic dispersants are discussed. Nano-specific biological endpoints may be developed for a tiered monitoring scheme to diagnose ENM exposure or effect. A case study of the algal growth test highlights many small deviations in current regulatory test protocols that are allowed (shaking, lighting, mixing methods), but these should be standardized for ENMs. Invertebrate (Daphnia) tests should account for mechanical toxicity of ENMs. Fish tests should consider semistatic exposure to minimize wastewater and animal husbandry. The inclusion of a benthic test is recommended for the base set of ecotoxicity tests with ENMs. The sensitivity of soil tests needs to be increased for ENMs and shortened for logistics reasons; improvements include using Caenorhabditis elegans, aquatic media, and metabolism endpoints in the plant growth tests. The existing bioaccumulation tests are conceptually flawed and require considerable modification, or a new test, to work for ENMs. Overall, most methodologies need some amendments, and recommendations are made to assist researchers. Environ. Toxicol. Chem. 2012;31:15-31. # 2011 SETAC

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Stability of titania nanoparticles in soil suspensions and transport in saturated homogeneous soil columns

Cited by 333 publications

References 39 publications

Metal‐based nanoparticles in soil: Fate, behavior, and effects on soil invertebrates

Metal‐based nanoparticles in soil: Fate, behavior, and effects on soil invertebrates

Stability of nTiO 2 particles and their attachment to sand: Effects of humic acid at different pH

Ecotoxicity test methods for engineered nanomaterials: Practical experiences and recommendations from the bench

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