基于非靶向高通量识别和数值模拟技术定量研究海底地下水排泄中有机污染物演变

滨海地下水中有机污染物来源复杂、种类繁多，不同类型有机污染物迁移转化特征和环境效应相差甚大，迫切需要开展海底地下水排泄中不同有机污染物的识别、迁移转化和入海通量研究。以莱州湾海庙附近滨海区为研究区，基于滨海地下水系统中有机污染物种类复杂且痕量的特征，通过优化前处理和非靶向识别策略，建立滨海地下水中有机污染物非靶向高通量识别方法；沿剖面采集不同时空分布的地下水、含水介质、海底沉积物和海水样品，采用非靶向高通量方法识别有机污染物及其浓度，解译其迁移转化过程；在浓度高、风险大的有机污染物中，选取3~5种典型有机物，开展同位素标记的室内实验，进一步验证并定量其转化的动力学过程；构建反映有机物迁移转化动力学过程及滨海特征的地下水和溶质运移耦合模型，模拟海底地下水排泄中典型有机污染物的演变过程和入海通量，为滨海水环境的防控和改善提供更具针对性的技术支撑，完善不同有机污染物在全球的迁移转化和归趋研究。

The sources of organic pollutants in coastal groundwater are complex and their types are numerous. The migration and transformation characteristics and environmental effects of different types of organic pollutants vary greatly. It is urgent to carry out the study on the migration and transformation of different organic pollutants and their flux into the sea. Taking the coastal area of Haimiao of Lianzhou Bay as the research area, based on the complex and trace characteristics of organic pollutants in the coastal groundwater system, a nontarget high-throughput identification method for organic pollutants in coastal groundwater was establishedbased by optimizing the pre-processing and nontarget recognition strategies. Groundwater, aquifers, seabed sediments and seawater samples with different time and space distributions were collected along the profile, and nontarget high-throughput methods were used to identify organic pollutants and their concentrations.Among the organic pollutants with high concentration response and high risk, 3~5 representative organic pollutants were selected to carry out the isotope-labeled indoor experiments, the combination of these experiments and high-throughput identification technology was used to study their migration and transformation effect in groundwater-sediment-seawater system and its dynamic process. Ajoint numerical model of coastal groundwater and solute migrationwhich reflectedthe dynamic process of organicsmigration and transformationwas constructedto simulate the evolution of different organicsin submarine groundwater discharge and their flux into the sea. The research provides more targeted technical support for the prevention and control of coastal water environment and helps improve the study on migration, transformation and fate of different organic pollutants in the world.