Bioavailability and distribution and of ceria nanoparticles in simulated aquatic ecosystems, quantification with a radiotracer technique.
Although the presence of manufactured nanoparticles in the aquatic environment is still largely undocumented, their release could certainly occur in the future, particularly via municipal treatment plant effluents of cities supporting nano-industries. To get an initial estimate of the environmental behavior of nanomaterials, we investigated the distribution and accumulation of ceria nanoparticles in simulated aquatic ecosystems which included aquatic plant, shellfish, fish, water, and sediment using a radiotracer technique. Radioactive ceria (141CeO2) nanoparticles with a diameter of ca. 7 nm were synthesized by a precipitation method and added to the simulated aquatic ecosystems. The results indicate that the concentration of ceria nanoparticles in water decreased to a steady-state value after 3 days; meanwhile, the concentrations of ceria nanoparticles in the aquatic plant and sediment increased to their highest values. The distribution and accumulation characteristics of ceria nanoparticles in various aquatic organisms were different. Ceratophyllum demersum showed a high ability of accumulation of ceria nanoparticles from water.
School of Biological Science and Engineering, South China University of Technology, Guangzhou 510641, China.
Kai
K
Lu
Zhiyong
Z
Zhang
Xiao
X
He
Yuhui
Y
Ma
Kebin
K
Zhou
Haifeng
H
Zhang
Wei
W
Bai
Yayun
Y
Ding
Zhenqiang
Z
Wu
Yuliang
Y
Zhao
Zhifang
Z
Chai
D059001:Aquatic Organisms / Q000737:chemistry / Q000378:metabolism*; D001682:Biological Availability; D002563:Cerium / Q000737:chemistry / Q000493:pharmacokinetics*; D003037:Cobalt Radioisotopes / Q000737:chemistry / Q000493:pharmacokinetics*; D017753:Ecosystem; D019015:Geologic Sediments / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008954:Models, Biological; D010316:Particle Size
D003037:Cobalt Radioisotopes; D002563:Cerium; C030583:ceric oxide