title: The influence of hydroxyl-functionalized multi-walled carbon nanotubes and pH levels on the toxicity of lead to Daphnia magna.
abstract: The acute toxicity of lead was examined for Daphnia magna in waters with different pH values (5.0, 6.0, 7.0, 8.0 and 9.0) and different concentrations (0.01, 0.10, 0.50 and 1.00 mg/L) of hydroxyl-functionalized multi-walled carbon nanotubes (OH-MWCNTs). The results indicated that pH values could affect the toxicity of lead. With pH values increasing from 5.0 to 9.0, the 24h-LC₅₀ of Pb(II) increased from 0.784 to 9.473 mg/L, suggesting that the toxicity of Pb(II) was dramatically decreased. Although OH-MWCNTs almost caused no lethal effect to D. magna at the studied four concentrations, the combination of OH-MWCNTs and Pb(II) could cause more serious toxic effects to D. magna than Pb(II) alone. This study indicated that the synergistic effect caused by CNTs and lead could not be neglected.
authors: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China.
authors: Li
authors: L
authors: Qin
authors: College of Agricultural and Environmental Sciences, Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223, United States.
authors: Qingguo
authors: Q
authors: Huang
authors: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China.
authors: Zhongbo
authors: Z
authors: Wei
authors: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China.
authors: Liansheng
authors: L
authors: Wang
authors: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China. Electronic address: wangzun315cn@163.com.
authors: Zunyao
authors: Z
authors: Wang
mesh_terms: D000818:Animals; D003621:Daphnia / Q000187:drug effects*; D004357:Drug Synergism; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry*; D007854:Lead / Q000633:toxicity*; D007928:Lethal Dose 50; D037742:Nanotubes, Carbon / Q000737:chemistry / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D007854:Lead; D017665:Hydroxyl Radical
keywords: Acute toxicity; Daphnia magna; Hydroxyl-functionalized multi-walled carbon nanotubes; Lead; pH values