水中正电性含氮有机物的研究方法、环境行为及其对消毒副产物的贡献研究

含氮有机物虽然在水中含量少，但是具有很高反应活性和环境影响，成为国际水环境研究的前沿话题。目前的溶解性有机氮（DON）相关测试方法只能获得总量数值，且误差较大，也无法给出组分信息，是一种“黑箱模型”。本研究首次提出正电性含氮有机物（DON+）的概念，以其作为DON的主要活性成分加以研究。首先建立一个精确的DON+测试方法，采用离子交换和梯度洗脱技术，将浓度远高于DON+的硝酸盐、亚硝酸盐和铵盐与DON+进行分离，然后再用总氮分析仪进行测试，可以获得更为准确的DON+数值。其次对藻类有机物、污水相关有机物等复杂DON+体系进行解析，将这个黑箱模型变成清晰度更高的灰箱模型，并研究其迁移转化。最后对DON+的消毒副产物生成贡献进行研究，推测含氮副产物生成潜能与含氮官能团存在较好的线性相关关系，也就是说DON+可能是更好的含氮消毒副产物的指示性参数。研究工作将指导水环境保护和供水处理工作。

Nitrogenous organic chemical presents high reactivity in water and important impact to aquatic environment. Therefore, it has been paid more and more attention by scientists all over the world. The recent detection method on dissolved organic nitrogen (DON) can only obtain the total amount with large error and cannot provide the component information. Thus, DON now is still a black box for the scientist to explore. In this study, we firstly create the concept of positive dissolved organic nitrogenous compounds (DON+) and regard it as the main active category for DON. First, we try to establish an accurate measurement method for DON+. This measure applies the ion exchange and dilution technology to separate the nitrate, nitrite and ammonium from the DON+, then the accurate DON+ value could be got by the total nitrogen analyzer be applied. Second, we will fractionate the complex DON+ components such as algal organic matter and wastewater-related organic matter, which will allow us to transform the black-box model into a grey-box model with higher resolution. The fate of DON+ in aquatic environment will also be investigated. Last, we will test the disinfection by-product formation potential (FP) for normal categories of DON+ which will allow.us to establish the co-relationship between nitrogenous DBP precursor. The results will demonstrate that DON+ could probably be the better parameter for nitrogenous DBPs or their precursors. This project will guide the protection of aquatic environment and water source and help the engineers to improve the water safety.