Ecotoxicity of non-aged and aged CeO2 nanomaterials towards freshwater microalgae

Manier, Nicolas; Bado‐Nilles, Anne; Delalain, Patrice; Aguerre-Chariol, Olivier; Pandard, Pascal

doi:10.1016/j.envpol.2013.04.040

Cited by 99 publications

(66 citation statements)

References 23 publications

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“…The sorption of CeO2 to the surface of algae, bacteria, plants and higher trophic organisms has correlated with toxic effects in several previous studies (Arnold et al 2013;Artells et al 2013;Booth et al, 2015;He et al, 2012;Manier et al (2013); Schwabe et al 2013;Vallotton et al, 2015). Artells et al (2013) found a much lower 48-h EC50 and stronger sorption of CeO2 to the distal spine of D. similis (48-h EC50 0.26 mg/L) than D. pulex (48-h EC50 91.8 mg/L) and Gaiser et al (2011) reported a correlation between CeO2 nanoparticle sorption to the carapace of D. magna and death, suggesting CeO2 sorption to these higher trophic organisms resulted in the toxicity.…”

Section: Discussionmentioning

confidence: 96%

On the mechanism of nanoparticulate CeO2 toxicity to freshwater algae

2015

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Section: Discussionmentioning

confidence: 96%

On the mechanism of nanoparticulate CeO2 toxicity to freshwater algae

2015

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“…However, compared to the human health studies, investigation of the environmental impact is relatively unexplored, albeit increasing attention in recent years. Various studies have been reported on the toxicity of nanomaterials such as inhibition on growth, damages to cells or behavioral changes, to various aquatic lives such as fish, zooplankton and phytoplankton [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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Nano-sized titanium dioxide (nano-TiO 2 ) has wide industrial applications and therefore considerable chances of exposure are created for human beings and ecosystems. To better understand the interactions between nano-TiO 2 and aquatic organisms, we first studied TiO 2 uptake by algae exemplified by Pseudokirchneriella subcapitata. P. subcapitata were exposed to nano-TiO 2 in a series of concentrations and at various pH. TiO 2 uptake was quantified using a sedimentation curve analysis technique. After exposure of algae to TiO 2 , the variation of zeta potential was measured and the morphology of algae-TiO 2 aggregate was observed with scanning electron microscopy and the optical microscopy. The steady-state TiO 2 uptake was found to be pH-dependent and the isotherms can be described well by Freundlich model. TiO 2 deposited on algal surfaces causes the shift of pH zpc of TiO 2 -covered algae from that of algae toward that of TiO 2 . The attraction between TiO 2 -covered algal cells induces the agglomeration of algae and TiO 2 and thus the formation of algae-TiO 2 aggregates in the size of 12 to 50 µm. The 2-D fractal dimension of the aggregates is pHdependent and ranges from 1.31 to 1.67. The theoretical analysis of the Gibbs energy of interaction indicates that both TiO 2 uptake by algae and the formation of algae-TiO 2 aggregate are influenced by the interaction between TiO 2 particles.

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“…Few studies have indicated the need to compare "aged" and "fresh" samples of ENP suspensions [17][18][19], highlighting the importance of investigating the dynamics of transformation processes throughout the duration of the test. While various studies have investigated the influence of NOM on the toxicity of the selected ENPs [20][21][22][23], to our knowledge, there is a lack of studies that systematically investigate the stability of stock suspensions and test suspensions in the presence of NOM and its implications on the outcome of toxicity tests.…”

Section: Introductionmentioning

confidence: 99%

The influence of natural organic matter and aging on suspension stability in guideline toxicity testing of silver, zinc oxide, and titanium dioxide nanoparticles with Daphnia magna

Cupi

Hartmann

Baun

2015

Enviro Toxic and Chemistry

106

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The present study investigated changes in suspension stability and ecotoxicity of engineered nanoparticles (ENPs) by addition of Suwannee River natural organic matter and aging of stock and test suspensions prior to testing. Acute toxicity tests of silver (Ag), zinc oxide (ZnO), and titanium dioxide (TiO2) ENPs with Daphnia magna were carried out following Organisation for Economic Co‐operation and Development test guidelines. Daphnia magna was found to be very sensitive to Ag ENPs (48‐h 50% effective concentration 33 μg L−1), and aging of the test suspensions in M7 medium (up to 48 h) did not decrease toxicity significantly. Conversely, the presence of Suwannee River natural organic matter (NOM; 20 mg L−1) completely alleviated Ag ENP toxicity in all testing scenarios and did not aid in stabilizing suspensions. In contrast, addition of Suwannee River NOM stabilized ZnO ENP suspensions and did not decrease toxicity. Aging for 48 h generated monotonous concentration–response curves in the presence and absence of Suwannee River NOM. At concentrations up to 100 mg L−1 TiO2 ENPs did not cause immobilization of D. magna under any of the tested conditions. Presence of Suwannee River NOM caused agglomeration in stock suspensions. The authors' results suggest that aging and presence of Suwannee River NOM are important parameters in standard toxicity testing of ENPs, which in some cases may aid in gaining better control over the exposure conditions but in other cases might contribute to agglomeration or elimination of ENP toxicity. Therefore, modifications to the current guidelines for testing ENPs should be evaluated on a case‐by‐case basis. Environ Toxicol Chem 2015;34:497–506. © 2014 SETAC

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Ecotoxicity of non-aged and aged CeO2 nanomaterials towards freshwater microalgae

Cited by 99 publications

References 23 publications

On the mechanism of nanoparticulate CeO2 toxicity to freshwater algae

On the mechanism of nanoparticulate CeO2 toxicity to freshwater algae

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

The influence of natural organic matter and aging on suspension stability in guideline toxicity testing of silver, zinc oxide, and titanium dioxide nanoparticles with Daphnia magna

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