College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; Xiamen Urban Water Environmental Eco-Planning and Remediation Engineering Research Center, Xiamen 361021, China.
Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
Sci Total Environ. 2018 Sep 15;636:1009-1019. doi: 10.1016/j.scitotenv.2018.04.358. Epub 2018 May 3.
The occurrence, spatiotemporal distribution and ecological risks of 27 antibiotics in water and sediments from rivers and coastal area of Zhuhai, Pearl River estuary, south China were investigated. Higher concentrations of antibiotics were found in river water in dry season than those in wet season (p < 0.01), especially for quinolones (QNs) (6.36-463 ng/L) and aminoglycosides (AGs) (94.9-458 ng/L). In coastal water samples, the concentrations of antibiotics were up to 419 ng/L and 357 ng/L in dry season and wet season, respectively. Higher concentrations of antibiotics in coastal sediment samples were observed in wet season compared with those in dry season (p < 0.01). This may be ascribed to the greater discharge of antibiotics from mariculture and surface sediment flushing in wet season, leading to the accumulation of polluted sediments in the estuary. Redundancy analysis showed that the concentrations of antibiotics in water were correlated with biological/chemical oxygen demand, ammonia nitrogen, and/or total nitrogen (TN). In addition, sediment organic matter (SOC) and TN strongly affected the distribution of antibiotics in sediments. Ecological risk assessment based on risk quotients (RQs) indicated that most antibiotics in water samples posed insignificant risk to fish and green algae, and insignificant to medium risk to daphnid.
本研究调查了中国南方珠江口珠海河流和沿海地区的水和沉积物中 27 种抗生素的发生、时空分布和生态风险。与雨季相比，旱季河水中的抗生素浓度更高（p<0.01），尤其是喹诺酮类（QNs）（6.36-463ng/L）和氨基糖苷类（AGs）（94.9-458ng/L）。在沿海水样中，旱季和雨季的抗生素浓度分别高达 419ng/L 和 357ng/L。与旱季相比，雨季沿海沉积物中抗生素的浓度更高（p<0.01）。这可能是由于雨季水产养殖和表层沉积物冲刷释放了更多的抗生素，导致污染物在河口处的沉积物中积累。冗余分析表明，水中抗生素的浓度与生物/化学需氧量、氨氮和/或总氮（TN）有关。此外，沉积物有机质（SOC）和 TN 强烈影响了抗生素在沉积物中的分布。基于风险商数（RQs）的生态风险评估表明，水样中的大多数抗生素对鱼类和绿藻的风险较小，对水蚤的风险为中到高。
