Dispersion and sedimentation of titanium dioxide nanoparticles in freshwater algae and daphnia aquatic culture media in the presence of arsenate

Abstract

Little information is available on Titanium dioxide nanoparticles (nTiO 2 ) behavior in different culture media for aquatic organisms. This study aimed to accurately evaluate nTiO 2 dispersion and sedimentation in common freshwater algae (BG-11) and daphnia aquatic (SM7) culture media. We additionally investigated potential mechanisms of nTiO 2 stability under arsenate influence. Results showed that high ionic strength in culture media was probably a key reason for the acute nTiO 2 agglomeration found. Additionally, the hydrodynamic size of nTiO 2 suspension in the presence of arsenate was significantly larger, increasing with arsenate concentration in ultrapure water. Conversely, the hydrodynamic size in BG-11 and SM7 decreased with arsenate concentration. The nTiO 2 sedimentation rate increased significantly with arsenate concentration in ultrapure water but significantly decreased in BG-11 and SM7 culture media. Many nTiO 2 remained suspended after initial rapid sedimentation and the slight sedimentation that occurred in the subsequent 24 h, suggesting that algae and daphnia within the water column will be exposed to small nanoparticle aggregates for a long period of time. Such nTiO 2 behavior, especially in the presence of arsenate, requires more consideration than the different toxicological results reported in literature.

Titanium dioxide nanoparticles promote histopathological and genotoxic effects in Danio rerio after acute and chronic exposures

“…A common behavior of TiO2-NPs is the tendency to aggregate and agglomerate, which was previously observed through SEM and transmission electron microscopy (TEM) in several studies (CARMO et al, 2019;LEE et al, 2019;VIGNARDI et al, 2015;LUO;YAN, 2018). In the DLS analysis, the particle sizes of TiO2-NPs corresponded to the estimated size by SEM due to N,Ndimethylformamide, which has previously demonstrated capable of turning the samples stable and monodisperse (TERISSE et al, 2013).…”

Electrical and thermal properties of insulating oil‐based nanofluids: a comprehensive overview

“…2. First, sedimentation and centrifugation techniques are the simplest and used by many researchers [26][27][28][29][30][31][32][33]. Stability of the nanofluids is usually observed for more than 1 month under the same environment and persistent physical conditions or centrifuged for more than 10 h at high rotation speed without sedimentation.…”

“…2 Iss. 1, pp [27][28][29][30][31][32][33][34][35][36][37][39][40] This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)…”

How the Physicochemical Properties of Manufactured Nanomaterials Affect Their Performance in Dispersion and Their Applications in Biomedicine: A Review

“…Ultrapure water was found to disperse TiO 2 better than freshwater microalgae and daphnia aquatic culture media ( Figure 1 ). The hydrodynamic size of the nanoparticles was found to slightly depend on concentration in the former case; whereas, the effect was significantly larger for the latter [ 18 ].…”

“… Dynamic light scattering (DLS) results for the size of TiO 2 agglomerates as a function of TiO 2 concentration in water, in freshwater microalgae cultured in Blue-Green medium (BG-11), and in daphnia magna cultured in simplified Elendt M7 medium (SM7). * denotes statistical differences from the control [ 18 ]. …”