4.7 Article

Seasonal occurrence, allocation and ecological risk of organophosphate esters in a typical urbanized semi-closed bay

Journal

ENVIRONMENTAL POLLUTION
Volume 290, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.118074

Keywords

OPEs; Seasonal variations; Partition coefficient; Risk assessment

Funding

  1. National Natural Science Founda-tion of China [U1706217]

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This study analyzed the seasonal occurrence and allocation of 12 organophosphate esters (OPEs) in water and sediment samples from the Jiaozhou Bay and surrounding rivers, finding a significant impact of terrestrial input on OPE contamination. The spatial distribution of OPEs in seawater varied seasonally and was influenced by terrestrial input and tidal currents. The partition coefficients of OPEs were strongly correlated with their hydrophobicity, indicating significant effects on water-sediment allocation.
In this study, water and sediment samples from the Jiaozhou Bay and surrounding rivers were collected to analyze the seasonal occurrence and allocation of 12 organophosphate esters (OPEs) and the associated ecological risk. The higher contamination of OPEs in the adjacent rivers indicated the impact of terrestrial input. Tris(1-chloropropan-2-yl) phosphate (TCIPP) was the predominant OPE in the four environmental sample groups investigated. The spatial distribution of OPEs in seawater varied greatly seasonally and was mainly affected by terrestrial input, with OPEs being redistributed under the influence of tidal currents. The partition coefficients (log Koc) of the OPEs were calculated, and their strong correlation with the log Kow (octanol-water) values suggested that the water-sediment allocation was significantly affected by hydrophobicity. The homologous relationships among the 7 OPEs with detection frequencies greater than 40% were identified by principal component analysis (PCA). The partial least squares regression (PLSR) model explicated that n-ary sumation OPEs cycling dynamics and principal controlling factors were dissimilar in the bay versus surrounding rivers. The risk quotient (RQ) faced by typical organisms in seawater and river water indicated that short-term OPEs exposure was safe for green algae, daphnia and fish. The organisms in rivers faced the higher ecological risk of OPEs in spring than in summer and winter. Therefore, the terrestrial transport of OPEs in spring should be controlled.

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