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An approach to the determination of N-nitrosodimethylamine at at part-per-quadrillion levels using Positive Chemical Ionization and Large-Volume Injection

Abstract: The presence of NDMA in surface waters designated for use drinking water use is of particular concern and the U.S. Environmental Protection Agency (EPA) has promulgated a regulatory standard for these waters of 0.7 ng/L (700 ppq). When in 1998 NDMA was detected in California drinking water in California, the source was associated with the production and use of a rocket fuel component, unsymmetrical dimethylhydrazine. In response, the California Department of Health Services (DHS) announced an action level in drinking water of 2 ng/l (2 ppt). However, the best available methods in the literature provide detection limits on the order of 2 – 3 ng/l. (EPA methods 625 and 1625 specify a detection limit for NDMA of 50 ppb -- 25,000 times the California DHS action level and 70,000 times the EPA regulatory standard). It follows that using existing methodologies, any detection of NDMA represents a violation. This note suggests an approach to meeting the promulgated US EPA regulatory standard and 2 ppt action level set by the State of California for NDMA.

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