Impact of Engineered Nanoparticles on Ecotoxicity of BDE-47 in Sediments

GONG Shuang-jiao;WANG Meng;LONG Yi;LIU Shan-shan;TIAN Bin;MA Tao-wu;College of Biology and Environmental Sciences,Jishou University;

Al2O3nanoparticles(Al2O3-NPs);;Ti O2nanoparticles(Ti O2-NPs);;Bellamya aeruginosa;;hepatopancreas;;SOD;;GST;;MDA

The extensive industrial applications of engineered nanoparticles(NPs)have caused concerns regarding their potential impact on human and environmental health. They may affect the bioavailability and ecotoxicity of other coexisting pollutants in the environment. This study was conducted to evaluate the ecotoxicity of persistent organic pollutant, 2, 2 ′, 4, 4′-tetrabromodiphenyl ether(BDE-47) in the presence of multi-walled carbon nanotubes(MWCNTs), Al2O3naoparticles(Al2O3-NPs), and Ti O2naoparticles(Ti O2-NPs) at non-toxic concentrations in sediments. Superoxide dismutase(SOD) and glutathione-S-transferase(GST) activities and malondialdehyde(MDA)content in the hepatopancreas of Bellamya aeroginosa were examined following chronic sediment bioassay. Results showed that MWCNTs with different tube diameters had no effects on the toxicity of low concentrations of BDE-47(100 ng·g-1)to B. aeroginosa, but significantly decreased the toxicity of high concentration of BDE- 47(500, 2000 ng·g- 1). Such effects were slightly greater in MWCN with small tube diameters than that with large tube diameters. Both Al2O3-NPs and Ti O2-NPs did not show effects on the toxicity of low concentration of BDE-47 to B. aeroginosa, but significantly increased the toxicity of relatively high concentration of BDE-47. Such effects of Ti O2-NPs were slightly greater than those of Al2O3-NPs. These results indicate that different types and varieties of NPs have distinct effects on the ecotoxicity of coexisting organic pollutants in sediments, which is also dependent on the concentrations of coexisting pollutants.