Benzophenone(BP)-type UV filters are continuously released into various aquatic environments via the effluent discharge of wastewater treatment plants (WWTPs) and recreational activities in coastal beaches. In this study, we developed a robust and reliable sampling approach, diffusive gradients in thin-films (DGT), for seasonal monitoring of six BP derivatives in coastal waters to investigate their occurrence and environmental risk. The binding capacities of both XAD-2 and HLB gels for test BPs were over 252 μg with no significant deterioration in marine environment, suggesting that theoretically, DGT is capable of sampling for at least 3 months effectively. The diffusion coefficients of BPs in freshwater and seawater were determined for the first time. The sampling performance showed no dependence on environmental conditions including pH (4.0–8.5), ionic strength (0.0001–0.5 M) and dissolved organic matter (0–20 mg L⁻¹). The developed DGT samplers were successfully applied in a river estuary linked to a WWTP and a bathing beach at different periods of one year. Results showed that the concentrations of BPs in the coastal waters were dependent on seasonal variation. The highest level in summer and the ecological risk should be considered based on the risk quotient values. These results demonstrated that the present DGT method is suitable for measuring, characterization, and risk assessment of BPs in freshwater and marine environment.

二苯甲酮 (BP) 型紫外线过滤剂通过污水处理厂 (WWTP) 的污水排放和沿海海滩的娱乐活动不断释放到各种水环境中。在这项研究中，我们开发了一种稳健可靠的采样方法，薄膜扩散梯度 (DGT)，用于对沿海水域中的六种 BP 衍生物进行季节性监测，以调查它们的发生和环境风险。XAD-2 和 HLB 凝胶对测试 BPs 的结合能力均超过 252 μg，海洋环境没有明显恶化，这表明理论上 DGT 能够有效采样至少 3 个月。首次测定了 BPs 在淡水和海水中的扩散系数。采样性能显示不依赖于环境条件，包括 pH 值（4.0-8.^{- 1} )。开发的DGT采样器在一年不同时期成功应用于与污水处理厂相连的河口和海水浴场。结果表明，沿海水域中BPs的浓度取决于季节变化。应根据风险商值考虑夏季最高水平和生态风险。这些结果表明，目前的 DGT 方法适用于淡水和海洋环境中 BPs 的测量、表征和风险评估。