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首页> 外文会议>Micropol amp; Ecohazard 2007 : Book of Abstracts >Detecting N-Nitrosamines in Alberta Drinking Waters at Nanogram per Liter Levels Using GC/MS Ammonia Positive Chemical Ionization
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Detecting N-Nitrosamines in Alberta Drinking Waters at Nanogram per Liter Levels Using GC/MS Ammonia Positive Chemical Ionization

机译：使用GC / MS氨正化学电离技术以每升纳克水平检测艾伯塔省饮用水中的N-亚硝胺

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摘要

North American drinking water utilities are increasingly incorporating alternative disinfectants, such as chloramines, in order to comply with disinfection by-product (DBP) regulations. N-Nitrosodimethylamine (NDMA) is an unregulated, non-halogenated DBP associated with chloramination, having a drinking water carcinogenic unit risk two to three orders of magnitude greater than currently regulated halogenated DBPs. Development of a selective, sensitive and affordable bench-top analytical method for eight N-nitrosamine species, at relevant drinking water concentrations (ng/L) was the primary objective of this project. A dual media (Ambersorb 572 and LiChrolut EN), off-line solid-phase extraction method, capable of processing ten samples simultaneously was developed in conjunction with GC/MS ammonia positive chemical ionization (PCI). Ammonia PCI showed excellent sensitivity and selectivity for N-nitrosamines. An occurrence study of twenty Alberta municipal drinking-water distribution systems was undertaken. We detected NDMA (up to 100 ng/L) as well as N-nitrosopyrrolidine (4 ng/L) and N-nitrosomorpholine (3 ng/L)-two N-nitrosamines not reported in drinking water before. NDMA drinking water concentrations consistently over 100 ng/L are some of the highest ever recorded, without anthropogenic point source contamination. The described analytical method had high recoveries of standards and analytes and offers a valuable new approach for investigating several N-nitroso compounds at ultra-trace levels in drinking water. Risk trade-off issues involving alternative disinfection methods and unregulated DBPs, such as NDMA, are emerging as a major water quality and public health information gap.
机译：北美饮用水企业越来越多地采用替代消毒剂，例如氯胺，以符合消毒副产品（DBP）法规。 N-亚硝基二甲胺（NDMA）是与氯化相关的不受管制的，非卤代的DBP，其饮用水致癌单元的危险性比目前管制的卤代DBP大2至3个数量级。该项目的主要目的是开发一种在相关饮用水浓度（ng / L）下对八种N-亚硝胺物种进行选择性，灵敏和负担得起的台式分析方法。结合GC / MS氨正化学电离（PCI），开发了一种能够同时处理十个样品的双重介质（Ambersorb 572和LiChrolut EN）离线固相萃取方法。氨PCI对N-亚硝胺显示出极好的灵敏度和选择性。对二十个艾伯塔省市政饮用水分配系统进行了研究。我们检测到NDMA（最高100 ng / L）以及N-亚硝基吡咯烷（4 ng / L）和N-亚硝基吗啉（3 ng / L）-饮用水中未曾报道过的两种N-亚硝胺。始终超过100 ng / L的NDMA饮用水浓度是有记录以来的最高水平，而没有人为点源污染。所描述的分析方法具有较高的标准品和分析物回收率，并且为研究饮用水中超痕量的几种N-亚硝基化合物提供了有价值的新方法。涉及替代消毒方法和不受管制的DBP（例如NDMA）的风险权衡问题正在成为主要的水质和公共卫生信息鸿沟。

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