In this study, the concentrations, spatial distribution and ecological risk of organophosphate esters (OPEs) in the riparian soil of Liao River were investigated. The total concentrations of OPEs were ranged from 19.6 to 89.4ng/g, with the mean concentration of 44.2ng/g. Compared with other studies, the OPEs pollution in riparian soil of Liao River was at a low level. The OPEs pollution was low in the upstream and high in the middle and downstream on the whole. Alkyl OPEs and triphenylphosphine oxide (TPPO) were the most abundant OPEs in upstream of Liao River, while only alkyl OPEs were the predominant OPEs in downstream. There was no correlation between the concentrations of OPEs and the content of total organic carbon (TOC) in the riparian soil of Liao River, which is related to the hydrophobic characteristics of OPEs. The hazard quotient of each individual OPE and the total hazard quotient of OPEs were all lower than 1, indicated that the ecological risk caused by OPEs in the riparian soil of Liao River was little.
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