Parameters determining the use of zeolite 5A as collector medium in passive flux samplers to estimate N2O emissions from livestock sources
2017
Larios, Araceli D. | Brar, Satinder Kaur | Ramírez, Antonio Avalos | Godbout, Stéphane | Sandoval-Salas, Fabiola | Palacios, Joahnn H. | Dubé, Patrick | Delgado, Beatriz | Giroir-Fendler, Anne
The present study analyzes the effect of parameters that determine the use of the zeolite 5A as collector medium in passive flux samplers (PFS) developed to estimate N₂O emissions from livestock buildings. The study analyzes the mass of N₂O collected on the zeolite 5A as a function of gas flow rate (40 and 130 ml/min), inlet mass of N₂O to the PFS (from 7 to 84 μg), adsorbent mass (4 and 13.6 g), length of the adsorbent bed (1.9 and 10.9 cm), and inlet N₂O concentration (0.6 and 2 ppmv). The mass of N₂O collected on the zeolite 5A ranged from 1.24 to 6.19 μg of N₂O/g of adsorbent, which was mainly affected by inlet N₂O concentration and mass of adsorbent contained in the PFS. The mass of N₂O collected presented a significant relationship with the inlet N₂O concentration and the adsorbent bed. Tests were performed using PFS in a laboratory farm under semi-real conditions. It was found that at sampling time of 1.5 h, the accuracy and precision of PFS was appropriate. Under evaluated conditions, a maximum variation between PFS and direct detection of around 12% was estimated.
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