School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China.
School of Life Science, Jinggangshan University, Ji'an, 343009, China.
Environ Sci Pollut Res Int. 2024 Oct;31(47):57645-57654. doi: 10.1007/s11356-024-34981-5. Epub 2024 Sep 17.
Antibiotics are increasingly found in urban lakes, posing significant ecological risks to lake ecosystems. The impact of sponge city facilities on urban flood control is significant; however, their influence on the exposure characteristics and risks associated with antibiotics in urban inland lakes remains unclear. This study investigated the exposure characteristics and evaluated the ecological risks of 15 antibiotics across seven lakes of Fuzhou (as the target of sponge city) in different seasons, in comparison to non-sponge cities. The results revealed that 12 antibiotics were consistently detectable across all lakes, with concentrations ranging from non-detectable (ND) to 20.61 ng/L, with sulfamethoxazole (SMX) emerging as the predominant contaminant. Most antibiotics exhibited higher concentrations in the dry season, attributed to environmental conditions, biological mechanisms, and their physicochemical properties. SMX, tetracycline (TTC), oxytetracycline (OTC), and ciprofloxacin (CIP) posed moderate to high ecological risks, with risk quotient (RQ) values of 0.46, 0.14, 0.17, and 0.61, respectively, while the remaining antibiotics presented lower ecological risks in both seasons. Notably, the RQ values for TTC, OTC, and CIP were elevated during the dry season, whereas SMX displayed a higher RQ value in the wet season, indicating an increased ecological risk during the dry months. In comparison to non-sponge cities, sponge cities exhibited significantly lower concentrations of nearly all antibiotics, particularly during the wet season (p ≤ 0.05). Moreover, over 85% of the antibiotics in non-sponge cities were classified as high risk, contrasted with only 55% in sponge cities, underscoring the heightened ecological risks associated with non-sponge urban designs. This study provides critical insights for controlling antibiotic pollution in the lakes of Fuzhou and serves as a valuable reference for maintaining aquatic ecosystem health through the implementation of sponge city infrastructure.
抗生素在城市湖泊中越来越多地被发现，对湖泊生态系统构成重大生态风险。海绵城市设施对城市防洪的影响显著；然而，它们对城市内陆湖泊中抗生素的暴露特征和风险的影响尚不清楚。本研究调查了 15 种抗生素在七个湖泊的暴露特征，并评估了它们在不同季节的生态风险，这些湖泊分别位于福州（作为海绵城市的目标）和非海绵城市。结果表明，所有湖泊均能持续检测到 12 种抗生素，浓度范围从无法检测到（ND）到 20.61ng/L，其中磺胺甲恶唑（SMX）是主要污染物。大多数抗生素在旱季的浓度较高，这归因于环境条件、生物机制和它们的物理化学性质。SMX、四环素（TTC）、土霉素（OTC）和环丙沙星（CIP）构成中至高生态风险，其风险商（RQ）值分别为 0.46、0.14、0.17 和 0.61，而其余抗生素在两个季节的生态风险较低。值得注意的是，TTC、OTC 和 CIP 的 RQ 值在旱季升高，而 SMX 在雨季的 RQ 值较高，表明旱月的生态风险增加。与非海绵城市相比，海绵城市的几乎所有抗生素浓度都显著降低，尤其是在雨季（p≤0.05）。此外，非海绵城市中超过 85%的抗生素被归类为高风险，而海绵城市中只有 55%，这突出表明非海绵城市设计与更高的生态风险相关。本研究为控制福州湖泊中的抗生素污染提供了重要的见解，并为通过实施海绵城市基础设施来维护水生态系统健康提供了有价值的参考。
