The Joint Toxicity of Phenols to Photobacterium phosphoreum

The single toxicity of phenol and 19 phenols to Photobacterium phosphoreum were determined respectively under pH=7.0.The binary joint toxicity examinations were performed for phenol and substituted phenols under the concentration ratio of equal toxic unit.Toxic unit method,additive index method,mixture toxicity index method and similarity parameter method were used to evaluate the joint toxicity.And the mechanism of joint toxicity was also investigated.The results showed that the binary mixtures of phenol and other substituted phenols mostly were synergistic effect and only a few were antagonistic or partly additional effect.For the same joint actions of binary mixtures of phenol and substituted phenols,the evaluated results of joint action types varies slightly with different evaluating methods.