N-亚硝二甲胺（NDMA）是一种致癌物质，已知存在于多种环境中 食品和工业产品。美国环境保护署 确定NDMA的10（-6）癌症风险水平为0.7纳克/升。已发现NDMA 在各种水和废水处理厂的废水中，但其形成 机制还不清楚。本研究评估了NDMA的形成过程 各种水和废水处理工艺，包括氯化和 氯胺化、臭氧氧化和离子交换。基于有限的结果 在这项研究中获得的NDMA似乎是 水和废水，与NDMA形成的水平直接相关 氯胺剂量。在测试的水域中，NDMA不会在与自由基接触时形成 氯或臭氧。 一种水与典型水平的胺基化合物的接触 聚合物没有形成任何可测量的NDMA水平（<2 ng/L）。批量测试 用四种强碱阴离子交换树脂与未经处理的溶液接触进行 地下水和缓冲去离子水。结果表明，一些树脂 可能会沥滤或形成NDMA，产生的NDMA水平取决于 树脂表面的化学官能团。包括19个参考文献、表格和图表。

N-nitrosodimethylamine (NDMA) is a carcinogen known to be present in various foods and industrial products. The US Environmental Protection Agency has established a 10(-6) cancer risk level for NDMA of 0.7 ng/l. NDMA has been found in the effluents of various water and wastewater plants, but its formation mechanism is not yet understood. This study evaluated NDMA formation during various water and wastewater treatment processes including chlorination and chloramination, ozonation, and ion exchange. On the basis of the limited results obtained in this study, NDMA appears to be a byproduct of the chloramination of water and wastewater, with the level of NDMA formed directly related to the chloramine dose. In the waters tested, NDMA did not form on contact with free chlorine or ozone. Contact of one water with typical levels of amine-based polymer did not form any measurable NDMA levels (<2 ng/L). Batch testing was conducted with four strong-base anion exchange resins contacted with untreated groundwater and with buffered deionized water. Results showed that some resins might leach or form NDMA and the level of NDMA produced is a function of the chemical functional group on the surface of the resin. Includes 19 references, tables, figures.