The toxic effect of DMP on three marine microalage, Dunaliella salina, Pavlova viridis and Phaeodactylum tricornutum is studied by a 96 h acute toxicity experiment, the endurance of the algae to DMP and the interaction between them are discussed as well. The results showed that DMP did inhibit the growth of three algae. The growth inhibition rates of DMP to three algae are 22.9～93.1%、42.1～82.2% and 61.9～92.2%, respectively when compared with the control. EC50 of DMP to Dunaliella salina, Pavlova viridis and Phaeodactylum tricornutum are 103.3,43.9 and 0.12 mg·L-1, respectively.
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