Seasonal occurrence, allocation and ecological risk of organophosphate esters in a typical urbanized semi-closed bay. (1st December 2021)

• Record Type: Journal Article
• Authors: Wu, Tingting; Mao, Lulu; Liu, Xitao; Wang, Baodong; Lin, Chunye; Xin, Ming; He, Mengchang; Ouyang, Wei
• Is Part Of: Environmental pollution. Volume 290(2021)
• Publication Date: 2021-12-01
• Subjects: OPEs -- Seasonal variations -- Partition coefficient -- Risk assessment; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2021.118074
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: 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 ∑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. Graphical abstract: Image 1 Highlights: The spatial distribution of OPEs in seawater showed seasonal variations. The calculated log Koc of OPEs displayed significant correlation with log Kow . The partial least squares regression explored ∑OPEs cycling dynamics. Risk of OPEs was higher in rivers than in the bay for green algae, daphnia and fish. Abstract : The partial least squares regression (PLSR) model indicated dissimilar source dynamics and principal controlling factors in the bay versus surrounding rivers.