本powerpoint演示文稿首先简要概述了NDMA和其他亚硝胺。目前的研究涉及以下主题:EPSRC资助，2007年9月至2009年9月（延长至2010年2月）；六家水处理厂、五家英国水务公司； 低地、高地、地下水资源； 氯胺化和氯化系统，胺基混凝剂； 氮含量和/或有机物含量较高的水源水； 未经处理、过滤、消毒、分发的水样； 季节性抽样（2008年四次，2009年一次）； NDMA、NMEA、NDEA、NDPA、NDBA、NPYR、NPIP、NMOR； 方法SPE+GC/MS；水源水质特征；另一所大学实验室和 英国认证商业实验室。 研究总结和正在进行的工作表明: 在绝大多数样本中未检测到NDMA和其他亚硝胺； 第一轮采样（2008年2月）显示亚硝胺含量较高 与随后几轮相比的水平——导致不确定，在未来几轮中不会再次出现 2009年2月；在其中一个配电系统中，NDBA始终高于MDL；分销网络中的亚硝胺水平与接触时间之间没有一致的关系；未观察到亚硝胺水平与水源特征或特定处理工艺之间的联系； 亚硝胺形成研究将于今年晚些时候在实验室完成- 各种消毒剂组合形成（NH₄Cl、HOCl、UV、O₃） 在不同的水质条件下。 包括表格、数字。

This powerpoint presentation begins by providing a brief overview of NDMA and other nitrosamines. A current study is presented by covering the following topics: EPSRC-funded, Sept 2007-Sept 2009 (extended to Feb 2010); six water treatment works, five United Kingdom water companies; lowland, upland, groundwater sources; chloraminated and chlorinated systems, amine-based coagulants; source waters with elevated N content and/or organic content; raw, filtered, disinfected, distributed water samples; seasonal sampling (four intervals in 2008, one in 2009); NDMA, NMEA, NDEA, NDPA, NDBA, NPYR, NPIP, NMOR; method - SPE + GC/MS; source water quality characterization; and, QA/QC comparison analysis by another university lab and by a certified commercial lab in the United Kingdom. Study summary and ongoing work indicates that: NDMA and other nitrosamines not detected in the vast majority of samples; first round of sampling (February 2008) exhibited higher nitrosamine levels than in subsequent rounds - cause uncertain, not seen again in February 2009 round; NDBA consistently above the MDL in one of the distribution systems; no consistent relationship between nitrosamine levels and contact time in the distribution network; no observed link between nitrosamine levels and source water characteristics or particular treatment processes; nitrosamine formation studies to be completed in the lab later this year - formation by various combinations of disinfectants (NH₄Cl, HOCl, UV, O₃) under different water quality conditions. Includes tables, figures.