N-亚硝基二甲胺（NDMA）是人们关注的消毒副产物之一 氯胺盐系统。NDMA已被证明优先与 二烯丙基二甲基氯化铵（DADMAC）与游离氯相比，氯胺 阳离子聚合物被用作处理助凝剂。DADMAC在全国范围内使用 用于凝血。东湾市政公用事业区（EBMUD）已对 在处理厂形成NDMA并将其影响降至最低的条件 形成（Wilczak等人，2003a）。文献报道在酸性条件下 二甲胺（DMA）或某些叔胺接触时可能形成NDMA条件 含有亚硝酸盐的胺，这是令人担忧的，因为亚硝酸盐通常存在于氯胺化溶液中 硝化和胺前体的分配系统可能出现在DADMAC阳离子溶液中 聚合物然而，在典型的水处理pH值下，这种反应不太可能发生 条件文献报道的机制研究表明 在水处理和分配条件下，NDMA的形成途径可能会改变 可能是胺前体和一氯胺之间的反应，以及 在DMA、亚硝酸盐和次氯酸之间。台架试验表明，NDMA是有效的 不是DADMAC聚合物污染物，在聚合物和 氨、亚硝酸盐和硝酸盐。因此，硝化作用不太可能起作用 当DADMAC是唯一重要的NDMA前体时（Wilczak et 艾尔，2003a）。在分配系统中进行了硝化监测计划 确认硝化作用对NDMA水平的影响。包括8个参考文献、表格、图表。

N-Nitrosodimethylamine (NDMA) is one of the disinfection byproducts of concern for systems that chloraminate. NDMA has been shown to form preferentially with chloramine than with free chlorine when diallyldimethylammonium chloride (DADMAC) cationic polymer was used as a treatment coagulant aid. DADMAC is used nationwide for coagulation. East Bay Municipal Utility District (EBMUD) has extensively tested the conditions under which NDMA was formed at the treatment plants and minimized its formation (Wilczak et al, 2003a). Literature references report that under acidic conditions NDMA may form upon the contact of dimethylamine (DMA) or certain tertiary amines with nitrite, which is of concern because nitrite is often present in chloraminated distribution systems that nitrify, and amine precursors may occur in DADMAC cationic polymer. However, this reaction was deemed unlikely under typical water treatment pH conditions. Mechanistic studies reported in the literature suggest that the main pathways of NDMA formation under conditions of water treatment and distribution would be a reaction between amine precursors and monochloramine, as well as a reaction between DMA, nitrite and the hypochlorous acid. Bench tests indicated that NDMA was not a DADMAC polymer contaminant and did not form in the presence of polymer and ammonia, nitrite and nitrate. It was, therefore, unlikely that nitrification would contribute to NDMA formation when DADMAC was the only significant NDMA precursor (Wilczak et al, 2003a). A nitrification monitoring program was conducted in the distribution system to confirm the effect of nitrification on NDMA levels. Includes 8 references, tables, figures.