AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Detection and Quantification of Atmospheric Compounds with a Compact Selective Reagent Ionization - Mass Spectrometer (C-SRI-MS)
ROLAND SARDA-ESTEVE, Dominique Baisnee, Sebastien Schramm, Geoffroy Chupin, Valérie Gros, Benjamin Loubet, Marc Peyraut, Christophe Bossuet, CEA
Abstract Number: 672 Working Group: Instrumentation and Methods
Abstract In the frame of Bio Chemical Collectors (BCC) research project from the French Atomic Energy Commission (CEA) a Compact Mass Spectrometer has been deployed during the spring 2016 in the region of Paris. The observation site chosen was an experimental farm well instrumented for atmospheric fluxes studies. A set of trace gases like Ozone (03), Carbone Dioxide(CO2) and Nitrous Oxides (NOx) are measured continuously all over the year. All these measurements are done directly in the crops and next to stables and one Bio Gas installation. The measurement site is often impacted by theses local sources as it is the case for Ammonia. The Ammonia is an interesting substance. It plays an important role in the atmospheric chemistry and particularly in the formation of Secondary Aerosols like Ammonium Nitrate. It is also an important intermediate for the chemical industry and considered as a Toxic Industrial Chemicals (TICs) substance. This observatory is well known for the detection and the quantification of Ammonia based on annular denuder coupled and ions chromatography quantification. This method which is relatively simple and robust provides semi continuous measurements. It gives integrated information on atmospheric concentrations but not on the fine variability. To solve this problem and identify the sources of NH3 in this complex environment, we tried to measure NH3 with a Compact Selective Reagent Ionization Mass Spectrometer (C-SRI-MS). The main objective of this campaign was to test the ability of a C-SRI-MS to monitor (TICs) substances and particularly, Ammonia (NH3) in real time and under atmospheric condition. In this work we present our results and describe the calibration procedure used to obtain atmospheric concentrations of NH3 to track the main sources.
This work is supported by the CBRN-E R&D research program from Joint ministerial program of R&D against CBRN-E threats.