Ecological risk assessment criteria for the sediment quality guidelines (SQGs) and Hakanson index.

C: concentration of heavy metal in surface sediment.TEC: threshold effect level; PEC: probable effect level [15].m-PEC-Q: mean PEC quotient; aincidence of toxicity [36].C：表层沉积物重金属浓度（concentration of heavy metal in surface sediment）；TEC：阈值效应水平（threshold effect level）；PEC：可能效应水平（probable effect level）[15]；m-PEC-Q：平均PEC商值（mean PEC quotient）；毒性发生率（incidence of toxicity）[36]。