title: Transmission and Accumulation of Nano-TiO2 in a 2-Step Food Chain (Scenedesmus obliquus to Daphnia magna).
abstract: The recent increase in nanomaterial usage has led to concerns surrounding its health risks and environmental impact. The food chain is an important pathway for high-trophic-level organisms absorbing and enriching nanomaterials. Our study therefore simulated nanometer titanium dioxide (nano-TiO2) transfer along a 2-step food chain, from the unicellular alga Scenedesmus obliquus to the water flea Daphnia magna. We also explored the effect of sodium dodecyl benzene sulfonate (SDBS) on nano-TiO2 bioavailability. A suspension of 10 mg/L nano-TiO2 was optimally dispersed in aqueous solutions by 5 mg/L SDBS. After 72 h, S. obliquus growth was not significantly affected by 10 mg/L nano-TiO2, 5 mg/L SDBS and their mixed suspension. SDBS not only improved nano-TiO2 stability in water, but also increased its uptake in S. obliquus and enhanced its accumulation in D. magna. Our study suggests that nano-TiO2 is mildly toxic to S. obliquus, and can be transferred along the aquatic food chain with a biomagnification effect.
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310032, People's Republic of China.
authors.forename: Jinyuan
authors.initials: J
authors.lastname: Chen
authors.forename: Herong
authors.initials: H
authors.lastname: Li
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Han
authors.forename: Xiuzhen
authors.initials: X
authors.lastname: Wei
mesh_terms: D000818:Animals; D001557:Benzenesulfonates / Q000494:pharmacology; D001682:Biological Availability; D003621:Daphnia / Q000378:metabolism*; D020387:Food Chain; D005618:Fresh Water; D053758:Nanoparticles / Q000378:metabolism*; D044444:Scenedesmus / Q000187:drug effects / Q000378:metabolism*; D014025:Titanium / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D001557:Benzenesulfonates; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C001114:dodecylbenzenesulfonic acid; D014025:Titanium