Sci Total Environ
Institut National de la Recherche Scientifique, Centre - Enegie Materieaux Telecommunications, 1650, boulevard Lionel-Boulet, Varennes, QC J3X 1S2, Canada; Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos Almirante Storni (CIMAS), Universidad nacional del Comahue- Prov de Rio Negro- CONICET, Güemes 1030, 8520 San Antonio Oeste, Rıo Negro, Argentina.
Published: March 2018
Titanium dioxide particles (TiO) are widely used to produce whitens (titanium white) and different class of nanomaterials (semiconductors, photo catalysts and nanotubes). Nanomaterials are excellent adsorbents and catalysts with a wide range of applications. However, these are reported to induce biological and genetic alterations among several invertebrate groups. Invasive species such as zebra mussels can be used as model organisms to study the behavior of particles and nanoparticles (NPs) due to their wide distribution; mussels have been extensively used for monitoring water pollution. In the present study, TiO particles were dispersed and added to a Chlorella culture to emulate a natural scenario. To study the reaction of zebra mussels to different TiO concentrations, they were fed with 0.35, 0.7 and 3.5 mgTiO/L of the suspension for 3days and the titanium was measured in the water column, mussels and sediments with ICP-AES. Zebra mussels obtained from the Port of Quebec had up 61.62mgTi/kg wet tissue at the time of capture. After 10days of depuration, they had from 0.23 to 16.28mgTi/kg wet tissue. Mussels accumulated TiO after 36h of exposition as a function of TiO concentration, but mussels did not present significant mortality due to TiO toxicity until concentrations higher than 0.7ppm. A second set of experiments was run to understand the TiO pathway attached to microalgae vs free TiO. Results indicated that mussels accumulated slightly more Ti when it was mixed with microalgae. However, the statistical difference was non- significant. A 100 times higher accumulation of Ti in sediments was identified when mussels are present. Thus, it was concluded that the sedimentation of TiO is enhanced by the zebra mussels' filtration activity.
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http://dx.doi.org/10.1016/j.scitotenv.2017.08.150 | DOI Listing |
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