EPA Method TO-7

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EPA Method TO-7:
METHOD FOR THE DETERMINATION OF N-NITROSODIMETHYLAMINE IN AMBIENT AIR USING GAS CHROMATROGRAPHY

Summary:
Ambient air is drawn through a Thermosorb/N adsorbent cartridge at a rate of approximately 2 L per minute for an appropriate period of time. Breakthrough has been shown not to be a problem with total sampling volumes of 300 L (i.e., 150 minutes at 2 L per minute). The selection of Thermosorb/N absorbent over Tenax GC, was due, in part, to recent laboratory studies indicating artifact formation on Tenax from the presence of oxides of nitrogen in the sample matrix.

Scope:
This document describes a method for determination of Nnitrosodimethylamine (NDMA) in ambient air. Although the method, as described, employs gas chromatography/mass spectrometry (GC/MS), other detection systems are allowed.

Report Number:
600/4-89-017