Study on Ecological Risk Threshold of Sulfonamides Antibiotics in Fenhe River Basin Based on Species Sensitivity Analysis and Phase Equilibrium Theory
Sulfonamide antibiotics(SAs)are widely used in medical treatment,livestock and poultry breeding,aquaculture and other fields.However,excessive use of SAs enters the water and sediment of watershed through domestic sewage,surface runoff,and so on,resulting in potential risks for the ecosystem.Predicted no effect concentration(PNEC)can be regarded as the threshold for assessing the potential ecological risk of pollutants,therefore calculating the PNEC of SAs in water and sediment is the key to assess the ecological risk.In this study,through collecting samples of water and sediment in Fenhe River Basin,a tributary of the Yellow River,the results showed that the concentrations of sulfamethoxazole(SMX)in water were the highest,with an average of 73.6 ng· L-1,and the detection rate of sulfacetamide(SAAM)was the highest,with 100％detection rate.However,only two types of SAs,SAAM and sulfaquinoxaline(SQX),were detected in the sediments,with detection frequency as high as 100％.Based on species sensitivity analysis(SSD),the ecological risk threshold for SAs in water was obtained,ranging from 3.40 to 440 μg·L-1.Then,combined the density,volume ratio and other parameters of water and sediment,the ecological risk threshold of SAs in the sediment was also obtained using the method phase equilibrium theory(EqP),and the results were 0.065～75.5 mg·kg-1.Based on the ecological risk threshold of SAs in water and sediment in the Fenhe River Basin,the ecological risk was further assessed.The results showed that the average risk quotient(RQ)of trimethoprim(TMP)in water was 0.014,which could result in low risk with the probability of exceeding the threshold being only 8％.The RQ values of the other were all less than 0.01,indicating insignificant risk.
万方数据
维普
