The chlorophenols have higer toxicity than alkylphenols. The 2,3,4,5,6-cl-phenol is the most toxical among theChlorophenols (EC50 Pholobaclerium p/josp/jorewm=0.5mg/l, EC50 Scenedesmus obiliauus = 1.10mg/1, LC50 Daphnia magua Straus =0.24mg/l).

• 而且，随着取代基的增加，氯代酚的毒性增大，五氯酚的毒性最大，发光菌的EC_(50)=0.；5mg/l，斜生栅藻的EC_(50)=1