[Distribution， Source Analysis， and Risk Assessment of Typical Emerging Contaminants in Groundwater Around Industrial...

In order to explore the pollution status of emerging contaminants in groundwater around industrial enterprises in South China， four industries were selected， and a total of eight groundwater samples were collected around these industries. Ultra-high-performance liquid chromatography-tandem mass spectrometry （UPLC-MS/MS） was used to determine the concentrations of enrofloxacin， ofloxacin， sulfadiazine， sulfamethoxazole， and tetracycline in the samples. Combined with various analytical methods， the study investigated the spatial distribution characteristics， source analysis， and ecological risk assessment of the target antibiotics. The test results showed that enrofloxacin was detected in the range of 43.93 to 228.68 ng·L^-1， and ofloxacin was detected in the range of 100.18 to 199.26 ng·L^-1 in groundwater samples. The detected concentration levels were relatively high compared to some regions of China. There were significant concentration differences in the spatial distribution of the two antibiotics， which may be related to the pollution sources and intensity. The main sources of pollution at W6 and W7 sampling points were agricultural non-point source pollution from domestic sewage and livestock waste， while the main sources of pollution at W1 and W4 sampling points were industrial point source pollution from solid waste and medical waste treatment production wastewater and leachate. The ecological risk assessment results showed that RQ_sum of enrofloxacin and ofloxacin at sampling point W7 to Pimephales promelas was greater than 0.1， indicating a medium risk， and there was a low risk to P. promelas at sampling point W6. Based on the current situation of groundwater used for fish and shrimp aquaculture in the study area， there were certain ecological risks in the groundwater of sampling points W6 and W7 that require further attention. The human health risk assessment results showed that enrofloxacin and ofloxacin in the sampling points of the study area posed no risk to the health of adults and children. The health risk quotient for children was higher than that for adults. Currently， there are no acceptable daily intake standards for different populations in China， and further in-depth research is needed to conduct a more accurate health risk assessment.