Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian Key Laboratory on Chemicals Risk Control and Pollution Prevention Technology, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian Key Laboratory on Chemicals Risk Control and Pollution Prevention Technology, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China.
Environ Int. 2021 Nov;156:106653. doi: 10.1016/j.envint.2021.106653. Epub 2021 May 24.
Diffusive gradients in thin-films (DGT) technique has been well demonstrated as a robust tool for measuring organic micropollutants (OMPs) in the aquatic environment. However, potential adsorption of the OMPs on organic polymer filters and flow rate of waters can affect the measuring results of the DGT method, hence tedious work should be conducted to reduce these interferences. In the present study, a novel DGT technique coupled with a ceramic diffusive layer was developed to measure the OMPs in seawaters. The ceramic diffusive layer exhibited adsorption inertness to the OMPs with various logK values. Moreover, the ceramic diffusive layer based DGT technique was proved to be less affected by the flow rate than the traditional DGT with agarose diffusive layer. The developed DGT device exhibited kinetic accumulation for the targets during a 6-d deployment, and measurement of the OMPs by the DGT method was independent with pH and ionic strength. Finally, the developed DGT sampler was applied in coastal waters of Dalian, and eight OMPs were detected with levels ranging from 1.58 to 13.1 ng/L. The development of the ceramic diffusive membrane can lead to simplification of the DGT applications, promoting the progress of the OMPs monitoring technology.
薄膜扩散梯度（DGT）技术已被证明是一种测量水环境污染中有机微量污染物（OMPs）的强大工具。然而，OMPs 在有机聚合物过滤器上的潜在吸附和水流速度可能会影响 DGT 方法的测量结果，因此需要进行繁琐的工作来减少这些干扰。在本研究中，开发了一种新型的 DGT 技术，与陶瓷扩散层相结合，用于测量海水中的 OMPs。陶瓷扩散层对具有不同 logK 值的 OMPs 表现出吸附惰性。此外，与传统的琼脂糖扩散层 DGT 技术相比，基于陶瓷扩散层的 DGT 技术受水流速度的影响较小。开发的 DGT 装置在 6 天的部署过程中对目标表现出动力学积累，并且 DGT 方法测量 OMPs 的结果与 pH 值和离子强度无关。最后，该开发的 DGT 采样器应用于大连沿海海域，并检测到 8 种 OMPs，浓度范围为 1.58 至 13.1ng/L。陶瓷扩散膜的发展可以简化 DGT 的应用，促进 OMPs 监测技术的进步。
