Environmeantal Protection Administration (EPA) Executine Yuan announced the “Emission Standards for Hazardous Air Pollutants from Stationary Pollution Sources” (draft) in 2019.There are 72 important hazardous air pollutants planned to develop the emission standards according to a three-stage schedule.The project developed sampled method and analytical method for NNitrosodimethylamine(NDMA), Aniline, o-Anisidine and o-Tolidine The project referred to NIOSH Method 2514, Issue2, RA01I004.002 and the first year project “The development of sampling and analytical methods for semivolatile organic compounds in ambient, including nitrobenzene etc. (1/2)”. The projct used methanol and methanol with 0.17 % trimethylamine as sampling medium, and used .Liquid chromatography–tandem mass spectrometry (HPLC/MS/MS) analyses. In analysis, the project followed to the “Environmental Testing Standard Method Verification Procedures Guidelines” set by the Environmental Analysis Laboratory, EPA for verifying feasibility of method. The project established evaluating method of investigation, including setting up calibration line, detecting method detect method, establishing quality and quantity, sampling. Analytical result of four compounds all reached standard of “Environmental Testing Standard Method Verification Procedures Guidelines”. Sampling methods include ambient air and stationary source. Both used same absorbent. NDMA used methanol as absorbent. Aniline, o-anisidine and otolidine used methanol with 0.17 % trimethylamine as absorbent. There are 4 samplings of stacks in the domestic factory with 2 ambient air sampling and 2 stationary source. There only had factories using aniline. Therefore the project added the other 3 compounds in absorbents. Sampling result said that there had aniline in ambient air and stationary source. The adding sampling recovery of o-anisidine and o-tolidine were both in 100 ± 40 %. The adding sampling recovery of NDMA were below 60 % in stationary source. Therefore the project sampled again at NOV. 11. The adding sampling recovery of NDMA was in 100 ± 40 %. One of the domestic factory had lower NDMA recovery than the other. We speculate that unknown matrix caused the lower recovery. The project conducted 2 skill publicity in August and September.

Hazardous Air Pollutants, ambient air, The tandem mass spectrometer