title: The toxicity of cadmium to three aquatic organisms (Photobacterium phosphoreum, Daphnia magna and Carassius auratus) under different pH levels.
abstract: This study investigated the effect of pH on cadmium toxicity to three aquatic organisms: Photobacterium phosphoreum, Daphnia magna and Carassius auratus. The acute toxicity of Cd(2+) to P. phosphoreum and D. magna at five pH values (5.0, 6.0, 7.0, 8.0, and 9.0) was assessed by calculating EC50 values. We determined that Cd(2+) was least toxic under acidic conditions, and D. magna was more sensitive to the toxicity of Cd than P. phosphoreum. To evaluate Cd(2+)-induced hepatic oxidative stress in C. auratus at three pH levels (5.0, 7.25, 9.0), the activity of antioxidant enzymes (superoxide dismutase, catalase and glutathione peroxidase), the level of glutathione and the malondialdehyde content in the liver were measured. Oxidative damage was observed after 7d Cd exposure at pH 9.0. An important finding of the current research was that Cd(2+) was generally more toxic to the three test organisms in alkaline environments than in acidic environments.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Xianlin Campus, Nanjing University, Nanjing 210023, Jiangsu, PR China.
authors.forename: R-J
authors.initials: RJ
authors.lastname: Qu
authors.forename: X-H
authors.initials: XH
authors.lastname: Wang
authors.forename: M-B
authors.initials: MB
authors.lastname: Feng
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.forename: H-X
authors.initials: HX
authors.lastname: Liu
authors.forename: L-S
authors.initials: LS
authors.lastname: Wang
authors.forename: Z-Y
authors.initials: ZY
authors.lastname: Wang
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D059001:Aquatic Organisms; D015415:Biomarkers / Q000378:metabolism; D002104:Cadmium / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D003621:Daphnia / Q000187:drug effects* / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D006054:Goldfish / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008099:Liver / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D010776:Photobacterium / Q000187:drug effects* / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism; D023382:Toxicity Tests, Acute
chemical_list: D000975:Antioxidants; D015415:Biomarkers; D002104:Cadmium; D008315:Malondialdehyde; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005978:Glutathione
keywords: Cadmium; Carassius auratus; Daphnia magna; Photobacterium phosphoreum; Toxicity; pH