title: Toxicity assessment of Chlorella vulgaris and Chlorella protothecoides following exposure to Pb(II).
abstract: The short- and long-term toxic effects of Pb(II) exposure on Chlorella vulgaris (C. vulgaris) and Chlorella protothecoides (C. protothecoides) were not well understood. The lab study was performed to observe the Pb(II) exposure induced changes. Results of the observations show: (1) higher level of Pb(II) (50 or 80mgL(-1)) could significantly inhibit the growth and chlorophyll a synthesis of both algae in almost all the treatments and dose-response relationships could be clearly observed, (2) the range of EC50 values (24-120h, 67.73-172.45mgL(-1)) indicated that Pb(II) had a relatively limited short-term toxicity to the two algae, while long-term tests (7-28d, 50.41-63.91mgL(-1)) displayed higher toxicity and (3) SOD and CAT activities of both algae after exposed to medium level of Pb(II) were significantly promoted, and their response might be more susceptible in short-term exposure. This research provides a basic understanding of Pb(II) toxicity to aquatic organisms.
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, PR China. wzhang@ecust.edu.cn
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Bang
authors.initials: B
authors.lastname: Xiong
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.forename: Kuangfei
authors.initials: K
authors.lastname: Lin
authors.forename: Xinhong
authors.initials: X
authors.lastname: Cui
authors.forename: Huasong
authors.initials: H
authors.lastname: Bi
authors.forename: Meijin
authors.initials: M
authors.lastname: Guo
authors.forename: Weiliang
authors.initials: W
authors.lastname: Wang
mesh_terms: D002374:Catalase / Q000378:metabolism; D002708:Chlorella / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D007854:Lead / Q000633:toxicity*; D013482:Superoxide Dismutase / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D007854:Lead; D002374:Catalase; D013482:Superoxide Dismutase; D000077194:Chlorophyll A