摘要
采用混合毒性指数法,研究了重金属离子Hg2+,Ni2+和Cu2+对嗜热四膜虫(Tetrahymena thermophila)BF5的急性及联合毒性效应.急性毒性效应研究表明:Hg2+,Ni2+和Cu2+对嗜热四膜虫的毒性大小为Hg2+>Ni2+>Cu2+,且3种重金属离子的IC50值随时间的延长而变小.联合毒性效应研究表明:Hg2+与Cu2+,Hg2+与Ni2+,以及Hg2+,Ni2+和Cu2+三者共存,在毒性比为1∶1时,表现为先相加后协同作用;Hg2+与Cu2+在浓度比为1∶1时,表现为先拮抗后相加作用;Hg2+与Ni2+在浓度比为1∶1时,表现为先拮抗后独立作用;Ni2+与Cu2+在毒性比为1∶1时,表现为协同作用,在浓度比为1∶1时表现为相加作用;Hg2+,Ni2+和Cu2+三者共存,在浓度比为1∶1时,表现为拮抗作用.
The mixture toxicity index method was used to study the toxicities of Hg^2＋ , Ni^2＋ and Cu^2＋ on Tetrahymena thermophila BF5 . The acute toxicities of Hg^2＋ , Ni^2＋ and Cu^2＋ were in the sequence of Hg^2＋ 〉 Ni^2＋ 〉 Cu2＋ , the median inhibition concentrations of these kinds of ions were reduced at time course. The joint toxicities of Hg^2＋ with Cu^2＋ , Hg^2＋ with Ni^2＋ ,Hg^2＋ , Ni^2＋ with Cu^2＋ at the toxicity proportion 1 ： 1 changed from additive to synergistic ; the joint toxicity of Hg^2＋ with Cu^2 ＋ at the concentration proportion 1 ： 1, changed from antagonistic to additive; the joint toxicity of Hg^2＋ with Ni^2＋ at the concentration proportion 1：1 changed from antagonistic to independent. The joint toxicity of Cu^2＋ with Ni^2＋ at the toxicity proportion was synergistic, at the concentration proportion was additive. The joint toxicity of Hg^2＋, Ni^2＋ with Cu^2＋ at the concentration proportion was antagonistic.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2008年第4期174-178,共5页
Research of Environmental Sciences
基金
国家自然科学基金项目(30470208)
兰州市科学技术局科研项目(03-1-66)
