Parameters determining the performance of passive flux samplers proposed as a tool to estimate N2O emissions: evaluation at farm level and perspectives
The passive flux sampling is an economic and easy way to estimate gas emissions from agriculture sources. In the last decade, specific passive flux samplers (PFSs) have been developed to estimate nitrous oxide (N2O) emissions from agriculture sources. Packed with silica gel and zeolite 5A, the PFSs were placed facing the emission source direction close to the ventilation shafts. For validation, air samples were taken at different sampling time during 3 days on two commercial sites. The adsorbed mass of N2O in PFSs was recovered by thermal desorption in the laboratory. Results indicated that the mass of N2O adsorbed in PFSs was from 1.5 to 5.5 μg. A specific adsorption pattern was observed for each sampling. In farm 1, the mass of N2O adsorbed in the PFSs presented a linear behavior as a function of sampling time, and the most determined coefficient values were higher than 0.80. In farm 2, in addition to the sampling time, the N2O concentration and the air flow rate presented an effect on the mass adsorbed in the PFSs. On the other hand, comparison of PFSs versus other techniques indicated that PFSs offer different advantages. However, the selectivity and capacity of the adsorbent bed used need to be improved to enhance the use of PFSs proposed as a tool to estimate N2O emissions.
KeywordsGreenhouse gas emissions Nitrous oxide Passive flux samplers Adsorption Agriculture sector Livestock buildings Gas sampling
Our sincere thanks go to Agriculture and Agri-Food Canada for economic support by means of the Agricultural Greenhouse Gases Program (AGGP). The main author would like to thank the Program for the Professional development of Professors (Prodep-Mexico) for the grant to perform the research stage. One coauthor would like to thank the FRQNT (research-college grant) for the financial support to participate in this study.
This study was financially supported by the Agriculture and Agri-Food Canada program.
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