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采用水生毒理联合效应相加指数法，比较了久效磷、辛硫磷、敌敌畏以及对硫磷的单剂和混合剂对扁藻的急性毒性和联合毒性。结果表明：久效磷和辛硫磷的联合毒性为协同作用；久效磷和敌敌畏的联合毒性为拮抗作用；久效磷和敌敌畏和对硫磷的48h联合毒性为协同作用，72h、96h则为拮抗作用。
Acute toxicity and combined toxicity of monomethyl, phoxim and dichlorvos as well as single and mixture of parathion on Platymonas sphaeroides were compared using aquatic toxicology combined effect additive index method. The results showed that the combined toxicity of monocrotophos and phoxim was synergistic; the combined toxicity of monocrotophos and dichlorvos was antagonistic; the combination of monocrotophos and dichlorvos with parathion 48h was synergistic; Antagonism.