Journal Title
Title of Journal: Arch Environ Contam Toxicol
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Abbravation: Archives of Environmental Contamination and Toxicology
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Authors: Taowu Ma Meng Wang Shuangjiao Gong Bin Tian
Publish Date: 2016/11/30
Volume: 72, Issue: 1, Pages: 153-165
Abstract
The environmental factors are expected to affect the ecotoxicity of heavy metals in the presence of engineered nanoparticles NPs in aquatic ecosystems However in sediment scenario little is known regarding their impacts on the ecotoxicity of coexposure of sedimentassociated heavy metals and NPs This study evaluated the impacts of different levels of organic matter OM 48–116 and pH 6–9 on the ecotoxicological effects of coexposure of sedimentassociated titanium dioxide nanoparticles TiO2NPs and cadmium Cd to a freshwater gastropod Bellamya aeruginosa The burdens of Ti and Cd and biomarkers of DNA damage Na+/K+ATPase lipid peroxidation LPO and protein carbonylation PC in the hepatopancreas were determined following 21 days of exposure At background level of OM 48 in sediments TiO2NPs significantly promoted Cd accumulation in lowCd treatments 5 mg/kg but did not promote Cd accumulation in highCd treatments 25 mg/kg At the relatively higher OM levels 71 and 116 TiO2NPs significantly enhanced Cd accumulation and toxicity as evidenced by aggravated DNA damage decreased Na+/K+ATPase activities and increased LPO and PC levels Moreover Cd burdens in both lowCd and highCd treatment were positively correlated with corresponding Ti burdens indicating TiO2NPs partially acted as carrier of Cd At all pH levels in lowCd treatments TiO2NPs did not affect Cd accumulation LPO and PC levels but significantly enhanced DNA damage and slightly facilitated the inhibition of Na+/K+ATPase activities In highCd treatments only at pH 9 TiO2NPs significantly enhanced Cd accumulation and toxicity Our results implied that interaction between TiO2NPs and OM or pH significantly affected the accumulation and toxicity of Cd in B aeruginosa but the underlying mechanisms need further investigation Additionally it should be noted that the potential ecological risk of coexposure of NPs and coexisting pollutants might be closely speciesspecific and related to environmental media
Keywords:
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