Chemical dispersants are frequently used in oil spill to deal with oil contamination onsurface water, and to avoid its potential impact on coastline and organisms after entry intodeep water. However, it was reported that chemical dispersants can enhanced acute toxicity ofcrude oil significantly, while few study has reported the impact of biological dispersants by Inoil spill accident of Dalian “7.16”,relevant departments used a large amount of chemical andbiological dispersants to eliminate oil pollution on...