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

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 24h, 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.