The average concentrations of 74 types of pollutants in surface sediment of Liaohe River protected areas were determined with the chemical analysis. A modified hazard potential index (HP) method, which took into account the summation of hazard potential values and occurrence and levels of organic pollutants, was applied for the calculation of weighted scores for each contaminant. The risk quotient was used in evaluating the ecological risk of nonionic ammonia in sediments to determine whether nonionic ammonia could be included in the list of risk pollutants. The potential ecological risk evaluation index and threshold effect concentration of EPA sediment quality guidelines were used together to screen heavy metals. The results showed that nonionic ammonia, Cd, Benzo[a]anthracene, Benzo[a]pyrene, Dichlorvos, and Benzo[k]fluoranthene, Chrysene and Indene[1,2,3-c,d] pyrene were risk pollutants in surface sediment of Liao protected areas.
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