The Correlation Between Quinolones And Physical-Chemical Factors And Typical Biological Communities In Baiyangdian Lake,North China

In this study,the concentrations of quinolones(QNs)in Baiyangdian Lake were detected by high performance liquid chromatography tandem mass spectrometry(HPLC-MS).The spatiotemporal characteristics of QNs were analyzed,and the correlations between QNs and physical-chemical factors and typical biological communities were constructed.Furthermore,the PNECs and RQs of QNs were derived by assessment factors(AF),species sensitivity distribution(SSD),and AQUATOX model methods.The main results were as follows:1)In 2018,the concentrations of ?QNs in water and sediment of Baiyangdian Lake ranged 153?2760 ng·L^-1and 20.3?1480 ng·g^-1,respectively.The physical-chemical parameters and QNs of Baiyangdian Lake showed significant spatiotemporal variation.The results of correlation analysis showed that some physical-chemical parameters had correlation with QNs,among which,SD,TN and NH₃-Ns in sediment were significantly correlated with some QNs,indicating that domestic sewage and aquaculture wastewater contributed to the QNs pollution.2)In 2017,the ecological risk of flumequine(FLU)was in the middle level,and the ecological risks of other QNs were lower;in terms of spatiotemporal variation,the ecological risk was appeared in August habitat 2.There were obvious spatial and temporal differences in the indicators of periphyton in Baiyangdian Lake.The correlation analysis result showed that there was a correlation between the indicators of periphyton and the ecological risk of QNs,among which the correlation between structural indicators of periphyton and ecological risk of QNs was more significant.Therefore,structural indicators of periphyton can be selected as the ecological indicators to evaluate the ecological risk of QNs.3)The bioaccumulation of QNs in Baiyangdian Lake in August 2018 showed that QNs had a low accumulation in dominant fish.In terms of trophic magnification factors,enrofloxacin was appeared trophic magnification,while FLU,mabofloxacin and QNs were appeared trophic dilution in Baiyangdian Lake.There was a significant correlation between physical-chemical parameters and bioaccumulation factors and trophic magnification factors,indicating bioaccumulation and trophic transfer of QNs in fish were influenced by the eutrophication.The HI ranged from 0.001 to 0.035,indicating that taking Baiyangdian fish were at a medium health risk.4)The PNECs and RQs of QNs derived by three approaches,AF,SSD and AQUATOX,showed the rank of:PNEC_SSDs>PNEC_AQUATOXs>PNEC_AFs;while the RQs followed the other rank of:RQ_SSDs<RQ_AQUATOXs<RQ_AFs.The results indicated that AQUATOX model comprehensively considered the direct and indirect ecological effects of compounds on the ecosystem,so it could be used for assessing the ecological risk of compounds.