Contamination Characteristics and Ecological Risk Assessment of Dioxins in Surface Sediments of Nearshore Waters in Fujian Province
Since the official issuance and implementation of the Action Plan for the Treatment of New Pollutants,monitoring of new pollutants has become a new hotspot in the field of ecological environment.In this study,iso-tope dilution high-resolution gas chromatography-high-resolution mass spectrometry(IRG-HRMS)was used to de-tect 17 dioxins(polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans,PCDD/Fs)in 22 surface sediment samples from nearshore waters of Fujian Province,correlation analysis and principal component analysis(PCA)were used to infer the possible sources of PCDD/Fs,and toxicity equivalence factors were applied for ecological risk assessment.The results show that only one congener of the 17 PCDD/Fs was not detected in the surface sedi-ments of nearshore waters in Fujian Province,and the concentration of Σ PCDD/Fs ranged from 58.7 to 3 980x 10-3 ng·g-1 dw(dry weight),with an average concentration of 1 169×10-3 ng·g-1 dw.The areas with high levels of PCDD/Fs were mainly concentrated in the waters near the Minjiang Estuary in Fuzhou City and Xiamen Bay in Xiamen City.The most abundant congener among the 16 PCDD/Fs detected was the less toxic octachlorodibenzo-p-dioxin(OCDD).The results of the source analyses indicated that PCDD/Fs in the surface sediments may mainly originate from hazardous and domestic waste incinerations and traffic emissions.The results of the ecological risk assessment showed that toxic equivalents(TEQ)at the 22 sampling sites are all at a low risk level.
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